Lamarckism

Lamarck argued, as part of his theory of heredity, that a blacksmith's sons inherit the strong muscles he acquires from his work.

Lamarckism, also known as Lamarckian inheritance or neo-Lamarckism, ^[2] is the notion that an organism can pass on to its offspring physical characteristics that the parent organism acquired through use or disuse during its lifetime. It is also called the inheritance of acquired characteristics or more recently soft inheritance. The idea is named after the French zoologist Jean-Baptiste Lamarck (1744–1829), who incorporated the classical era theory of soft inheritance into his theory of evolution as a supplement to his concept of orthogenesis, a drive towards complexity.

Introductory textbooks contrast Lamarckism with Charles Darwin's theory of evolution by natural selection. However, Darwin's book On the Origin of Species gave credence to the idea of heritable effects of use and disuse, as Lamarck had done, and his own concept of pangenesis similarly implied soft inheritance. ^{[2] [3]}

Many researchers from the 1860s onwards attempted to find evidence for Lamarckian inheritance, but these have all been explained away, ^{[4] [5]} either by other mechanisms such as genetic contamination or as fraud. August Weismann's experiment, considered definitive in its time, is now considered to have failed to disprove Lamarckism, as it did not address use and disuse. Later, Mendelian genetics supplanted the notion of inheritance of acquired traits, eventually leading to the development of the modern synthesis, and the general abandonment of Lamarckism in biology. Despite this, interest in Lamarckism has continued.

In the 21st century, experimental results in the fields of epigenetics, genetics, and somatic hypermutation demonstrated the possibility of transgenerational epigenetic inheritance of traits acquired by the previous generation. These proved a limited validity of Lamarckism. ^[6] The inheritance of the hologenome, consisting of the genomes of all an organism's symbiotic microbes as well as its own genome, is also somewhat Lamarckian in effect, though entirely Darwinian in its mechanisms. ^[7]

Early history

Origins

Jean-Baptiste Lamarck repeated the ancient folk wisdom of the inheritance of acquired characteristics.

The inheritance of acquired characteristics was proposed in ancient times and remained a current idea for many centuries. The historian of science Conway Zirkle wrote in 1935 that: ^[8]

Lamarck was neither the first nor the most distinguished biologist to believe in the inheritance of acquired characters. He merely endorsed a belief which had been generally accepted for at least 2,200 years before his time and used it to explain how evolution could have taken place. The inheritance of acquired characters had been accepted previously by Hippocrates, Aristotle, Galen, Roger Bacon, Jerome Cardan, Levinus Lemnius, John Ray, Michael Adanson, Jo. Fried. Blumenbach and Erasmus Darwin among others. ^[8]

Zirkle noted that Hippocrates described pangenesis, the theory that what is inherited derives from the whole body of the parent, whereas Aristotle thought it impossible; but that all the same, Aristotle implicitly agreed to the inheritance of acquired characteristics, giving the example of the inheritance of a scar, or of blindness, though noting that children do not always resemble their parents. Zirkle recorded that Pliny the Elder thought much the same. Zirkle pointed out that stories involving the idea of inheritance of acquired characteristics appear numerous times in ancient mythology and the Bible and persisted through to Rudyard Kipling's Just So Stories . ^[9] The idea is mentioned in 18th century sources such as Diderot's D'Alembert's Dream . ^[10] Erasmus Darwin's Zoonomia (c. 1795) suggested that warm-blooded animals develop from "one living filament... with the power of acquiring new parts" in response to stimuli, with each round of "improvements" being inherited by successive generations. ^[11]

Darwin's pangenesis

Main article: Pangenesis

Charles Darwin's pangenesis theory. Every part of the body emits tiny gemmules which migrate to the gonads and contribute to the next generation via the fertilised egg. Changes to the body during an organism's life would be inherited, as in Lamarckism.

Charles Darwin's On the Origin of Species proposed natural selection as the main mechanism for development of species, but (like Lamarck) gave credence to the idea of heritable effects of use and disuse as a supplementary mechanism. ^[12] Darwin subsequently set out his concept of pangenesis in the final chapter of his book The Variation of Animals and Plants Under Domestication (1868), which gave numerous examples to demonstrate what he thought was the inheritance of acquired characteristics. Pangenesis, which he emphasised was a hypothesis, was based on the idea that somatic cells would, in response to environmental stimulation (use and disuse), throw off 'gemmules' or 'pangenes' which travelled around the body, though not necessarily in the bloodstream. These pangenes were microscopic particles that supposedly contained information about the characteristics of their parent cell, and Darwin believed that they eventually accumulated in the germ cells where they could pass on to the next generation the newly acquired characteristics of the parents. ^{[13] [14]}

Darwin's half-cousin, Francis Galton, carried out experiments on rabbits, with Darwin's cooperation, in which he transfused the blood of one variety of rabbit into another variety in the expectation that its offspring would show some characteristics of the first. They did not, and Galton declared that he had disproved Darwin's hypothesis of pangenesis, but Darwin objected, in a letter to the scientific journal Nature , that he had done nothing of the sort, since he had never mentioned blood in his writings. He pointed out that he regarded pangenesis as occurring in protozoa and plants, which have no blood, as well as in animals. ^[15]

Lamarck's evolutionary framework

Lamarck's two-factor theory involves 1) a complexifying force that drives animal body plans towards higher levels (orthogenesis) creating a ladder of phyla, and 2) an adaptive force that causes animals with a given body plan to adapt to circumstances (use and disuse, inheritance of acquired characteristics), creating a diversity of species and genera. Lamarckism is the name now widely used for the adaptive force.

Further information: Jean-Baptiste Lamarck § Lamarckian evolution

Between 1800 and 1830, Lamarck proposed a systematic theoretical framework for understanding evolution. He saw evolution as comprising four laws: ^{[16] [17]}

1. "Life by its own force, tends to increase the volume of all organs which possess the force of life, and the force of life extends the dimensions of those parts up to an extent that those parts bring to themselves;"
2. "The production of a new organ in an animal body, results from a new requirement arising. and which continues to make itself felt, and a new movement which that requirement gives birth to, and its upkeep/maintenance;"
3. "The development of the organs, and their ability, are constantly a result of the use of those organs."
4. "All that has been acquired, traced, or changed, in the physiology of individuals, during their life, is conserved through the genesis, reproduction, and transmitted to new individuals who are related to those who have undergone those changes."

Lamarck's discussion of heredity

In 1830, in an aside from his evolutionary framework, Lamarck briefly mentioned two traditional ideas in his discussion of heredity, in his day considered to be generally true. The first was the idea of use versus disuse; he theorized that individuals lose characteristics they do not require, or use, and develop characteristics that are useful. The second was to argue that the acquired traits were heritable. He gave as an imagined illustration the idea that when giraffes stretch their necks to reach leaves high in trees, they would strengthen and gradually lengthen their necks. These giraffes would then have offspring with slightly longer necks. In the same way, he argued, a blacksmith, through his work, strengthens the muscles in his arms, and thus his sons would have similar muscular development when they mature. Lamarck stated the following two laws: ^[1]

1. Première Loi: Dans tout animal qui n' a point dépassé le terme de ses développemens, l' emploi plus fréquent et soutenu d' un organe quelconque, fortifie peu à peu cet organe, le développe, l' agrandit, et lui donne une puissance proportionnée à la durée de cet emploi; tandis que le défaut constant d' usage de tel organe, l'affoiblit insensiblement, le détériore, diminue progressivement ses facultés, et finit par le faire disparoître. ^[1]
2. Deuxième Loi: Tout ce que la nature a fait acquérir ou perdre aux individus par l' influence des circonstances où leur race se trouve depuis long-temps exposée, et, par conséquent, par l' influence de l' emploi prédominant de tel organe, ou par celle d' un défaut constant d' usage de telle partie; elle le conserve par la génération aux nouveaux individus qui en proviennent, pourvu que les changemens acquis soient communs aux deux sexes, ou à ceux qui ont produit ces nouveaux individus. ^[1]

English translation:

1. First Law [Use and Disuse]: In every animal which has not passed the limit of its development, a more frequent and continuous use of any organ gradually strengthens, develops and enlarges that organ, and gives it a power proportional to the length of time it has been so used; while the permanent disuse of any organ imperceptibly weakens and deteriorates it, and progressively diminishes its functional capacity, until it finally disappears.
2. Second Law [Soft Inheritance]: All the acquisitions or losses wrought by nature on individuals, through the influence of the environment in which their race has long been placed, and hence through the influence of the predominant use or permanent disuse of any organ; all these are preserved by reproduction to the new individuals which arise, provided that the acquired modifications are common to both sexes, or at least to the individuals which produce the young. ^[18]

In essence, a change in the environment brings about change in "needs" (besoins), resulting in change in behaviour, causing change in organ usage and development, bringing change in form over time—and thus the gradual transmutation of the species. As the evolutionary biologists and historians of science Conway Zirkle, Michael Ghiselin, and Stephen Jay Gould have pointed out, these ideas were not original to Lamarck. ^{[8] [2] [19]}

Weismann's experiment

August Weismann's germ plasm theory. The hereditary material, the germ plasm, is confined to the gonads and the gametes. Somatic cells (of the body) develop afresh in each generation from the germ plasm, creating an invisible "Weismann barrier" to Lamarckian influence from the soma to the next generation.

August Weismann's germ plasm theory held that germline cells in the gonads contain information that passes from one generation to the next, unaffected by experience, and independent of the somatic (body) cells. This implied what came to be known as the Weismann barrier, as it would make Lamarckian inheritance from changes to the body difficult or impossible. ^[20]

Weismann conducted the experiment of removing the tails of 68 white mice, and those of their offspring over five generations, and reporting that no mice were born in consequence without a tail or even with a shorter tail. In 1889, he stated that "901 young were produced by five generations of artificially mutilated parents, and yet there was not a single example of a rudimentary tail or of any other abnormality in this organ." ^[21] The experiment, and the theory behind it, were thought at the time to be a refutation of Lamarckism. ^[20]

The experiment's effectiveness in refuting Lamarck's hypothesis is doubtful, as it did not address the use and disuse of characteristics in response to the environment. The biologist Peter Gauthier noted in 1990 that: ^[22]

Can Weismann's experiment be considered a case of disuse? Lamarck proposed that when an organ was not used, it slowly, and very gradually atrophied. In time, over the course of many generations, it would gradually disappear as it was inherited in its modified form in each successive generation. Cutting the tails off mice does not seem to meet the qualifications of disuse, but rather falls in a category of accidental misuse... Lamarck's hypothesis has never been proven experimentally and there is no known mechanism to support the idea that somatic change, however acquired, can in some way induce a change in the germplasm. On the other hand it is difficult to disprove Lamarck's idea experimentally, and it seems that Weismann's experiment fails to provide the evidence to deny the Lamarckian hypothesis, since it lacks a key factor, namely the willful exertion of the animal in overcoming environmental obstacles. ^[22]

Ghiselin also considered the Weismann tail-chopping experiment to have no bearing on the Lamarckian hypothesis, writing in 1994 that: ^[2]

The acquired characteristics that figured in Lamarck's thinking were changes that resulted from an individual's own drives and actions, not from the actions of external agents. Lamarck was not concerned with wounds, injuries or mutilations, and nothing that Lamarck had set forth was tested or "disproven" by the Weismann tail-chopping experiment. ^[2]

The historian of science Rasmus Winther stated that Weismann had nuanced views about the role of the environment on the germ plasm. Indeed, like Darwin, he consistently insisted that a variable environment was necessary to cause variation in the hereditary material. ^[23]

Textbook Lamarckism

The long neck of the giraffe is often used as an example in popular explanations of Lamarckism. However, this was only a small part of his theory of evolution towards "perfection"; it was a hypothetical illustration; and he used it to discuss his theory of heredity, not evolution.

The identification of Lamarckism with the inheritance of acquired characteristics is regarded by evolutionary biologists including Ghiselin as a falsified artifact of the subsequent history of evolutionary thought, repeated in textbooks without analysis, and wrongly contrasted with a falsified picture of Darwin's thinking. Ghiselin notes that "Darwin accepted the inheritance of acquired characteristics, just as Lamarck did, and Darwin even thought that there was some experimental evidence to support it." ^[2] Gould wrote that in the late 19th century, evolutionists "re-read Lamarck, cast aside the guts of it ... and elevated one aspect of the mechanics—inheritance of acquired characters—to a central focus it never had for Lamarck himself." ^[24] He argued that "the restriction of 'Lamarckism' to this relatively small and non-distinctive corner of Lamarck's thought must be labelled as more than a misnomer, and truly a discredit to the memory of a man and his much more comprehensive system." ^{[3] [25]}

Neo-Lamarckism

Context

Further information: Eclipse of Darwinism and Orthogenesis

Edward Drinker Cope

The period of the history of evolutionary thought between Darwin's death in the 1880s, and the foundation of population genetics in the 1920s and the beginnings of the modern evolutionary synthesis in the 1930s, is called the eclipse of Darwinism by some historians of science. During that time many scientists and philosophers accepted the reality of evolution but doubted whether natural selection was the main evolutionary mechanism. ^[26]

Among the most popular alternatives were theories involving the inheritance of characteristics acquired during an organism's lifetime. Scientists who felt that such Lamarckian mechanisms were the key to evolution were called neo-Lamarckians. They included the British botanist George Henslow (1835–1925), who studied the effects of environmental stress on the growth of plants, in the belief that such environmentally-induced variation might explain much of plant evolution, and the American entomologist Alpheus Spring Packard Jr., who studied blind animals living in caves and wrote a book in 1901 about Lamarck and his work. ^{[27] [28]} Also included were paleontologists like Edward Drinker Cope and Alpheus Hyatt, who observed that the fossil record showed orderly, almost linear, patterns of development that they felt were better explained by Lamarckian mechanisms than by natural selection. Some people, including Cope and the Darwin critic Samuel Butler, felt that inheritance of acquired characteristics would let organisms shape their own evolution, since organisms that acquired new habits would change the use patterns of their organs, which would kick-start Lamarckian evolution. They considered this philosophically superior to Darwin's mechanism of random variation acted on by selective pressures. Lamarckism also appealed to those, like the philosopher Herbert Spencer and the German anatomist Ernst Haeckel, who saw evolution as an inherently progressive process. ^[27] The German zoologist Theodor Eimer combined Larmarckism with ideas about orthogenesis, the idea that evolution is directed towards a goal. ^[29]

With the development of the modern synthesis of the theory of evolution, and a lack of evidence for a mechanism for acquiring and passing on new characteristics, or even their heritability, Lamarckism largely fell from favour. Unlike neo-Darwinism, neo-Lamarckism is a loose grouping of largely heterodox theories and mechanisms that emerged after Lamarck's time, rather than a coherent body of theoretical work. ^[30]

19th century

Charles-Édouard Brown-Séquard tried to demonstrate Lamarckism by mutilating guinea pigs.

Neo-Lamarckian versions of evolution were widespread in the late 19th century. The idea that living things could to some degree choose the characteristics that would be inherited allowed them to be in charge of their own destiny as opposed to the Darwinian view, which placed them at the mercy of the environment. Such ideas were more popular than natural selection in the late 19th century as it made it possible for biological evolution to fit into a framework of a divine or naturally willed plan, thus the neo-Lamarckian view of evolution was often advocated by proponents of orthogenesis. ^[31] According to the historian of science Peter J. Bowler, writing in 2003:

One of the most emotionally compelling arguments used by the neo-Lamarckians of the late nineteenth century was the claim that Darwinism was a mechanistic theory which reduced living things to puppets driven by heredity. The selection theory made life into a game of Russian roulette, where life or death was predetermined by the genes one inherited. The individual could do nothing to mitigate bad heredity. Lamarckism, in contrast, allowed the individual to choose a new habit when faced with an environmental challenge and shape the whole future course of evolution. ^[32]

Scientists from the 1860s onwards conducted numerous experiments that purported to show Lamarckian inheritance. Some examples are described in the table.

19th century experiments attempting to demonstrate Lamarckian inheritance

Scientist	Date	Experiment	Claimed result	Rebuttal
Charles-Édouard Brown-Séquard	1869 to 1891	Cut sciatic nerve and dorsal spinal cord of guinea pigs, causing abnormal nervous condition resembling epilepsy	Epileptic offspring	Not Lamarckism, as no use and disuse in response to environment; results could not be replicated; cause possibly a transmitted disease. [33] [34] [35] [36] [37] [38]
Gaston Bonnier	1884, 1886	Transplant plants at different altitudes in Alps, Pyrenees	Acquired adaptations	Not controlled from weeds; likely cause genetic contamination [39]
Joseph Thomas Cunningham	1891, 1893, 1895	Shine light on underside of flatfish	Inherited production of pigment	Disputed cause [40] [41] [42] [43] [44] [45]
Max Standfuss	1892 to 1917	Raise butterflies at low temperature	Variations in offspring even without low temperature	Richard Goldschmidt agreed; Ernst Mayr "difficult to interpret". [46] [47] [48] [49]

Early 20th century

Paul Kammerer claimed in the 1920s to have found evidence for Lamarckian inheritance in midwife toads, in a case celebrated by the journalist Arthur Koestler, but the results are thought to be either fraudulent or at best misinterpreted.

A century after Lamarck, scientists and philosophers continued to seek mechanisms and evidence for the inheritance of acquired characteristics. Experiments were sometimes reported as successful, but from the beginning these were either criticised on scientific grounds or shown to be fakes. ^{[50] [51] [52] [4] [5]} For instance, in 1906, the philosopher Eugenio Rignano argued for a version that he called "centro-epigenesis", ^{[53] [54] [55] [56] [57] [58]} but it was rejected by most scientists. ^[59] Some of the experimental approaches are described in the table.

Early 20th century experiments attempting to demonstrate Lamarckian inheritance

Scientist	Date	Experiment	Claimed result	Rebuttal
William Lawrence Tower	1907 to 1910	Colorado potato beetles in extreme humidity, temperature	Heritable changes in size, colour	Criticised by William Bateson; Tower claimed all results lost in fire; William E. Castle visited laboratory, found fire suspicious, doubted claim that steam leak had killed all beetles, concluded faked data. [60] [61] [62] [51] [52]
Gustav Tornier	1907 to 1918	Goldfish, embryos of frogs, newts	Abnormalities inherited	Disputed; possibly an osmotic effect [63] [64] [65] [66]
Charles Rupert Stockard	1910	Repeated alcohol intoxication of pregnant guinea pigs	Inherited malformations	Raymond Pearl unable to reproduce findings in chickens; Darwinian explanation [67] [50]
Francis Bertody Sumner	1921	Reared mice at different temperatures, humidities	Inherited longer bodies, tails, hind feet	Inconsistent results [68] [69]
Michael F. Guyer, Elizabeth A. Smith	1918 to 1924	Injected fowl serum antibodies for rabbit lens-protein into pregnant rabbits	Eye defects inherited for 8 generations	Disputed, results not replicated [70] [71]
Paul Kammerer	1920s	Midwife toad	Black foot-pads inherited	Fraud, ink injected; or, results misinterpreted; case celebrated by Arthur Koestler arguing that opposition was political [4] [72]
William McDougall	1920s	Rats solving mazes	Offspring learnt mazes quicker (20 vs 165 trials)	Poor experimental controls [73] [74] [75] [76] [77] [78] [5]
John William Heslop-Harrison	1920s	Peppered moths exposed to soot	Inherited mutations caused by soot	Failure to replicate results; implausible mutation rate [79] [80]
Ivan Pavlov	1926	Conditioned reflex in mice to food and bell	Offspring easier to condition	Pavlov retracted claim; results not replicable [81] [82]
Coleman Griffith, John Detlefson	1920 to 1925	Reared rats on rotating table for 3 months	Inherited balance disorder	Results not replicable; likely cause ear infection [83] [84] [85] [86] [87] [88]
Victor Jollos  [ pl ]	1930s	Heat treatment in Drosophila melanogaster	Directed mutagenesis, a form of orthogenesis	Results not replicable [89] [90]

Late 20th century

The British anthropologist Frederic Wood Jones and the South African paleontologist Robert Broom supported a neo-Lamarckian view of human evolution. The German anthropologist Hermann Klaatsch relied on a neo-Lamarckian model of evolution to try and explain the origin of bipedalism. Neo-Lamarckism remained influential in biology until the 1940s when the role of natural selection was reasserted in evolution as part of the modern evolutionary synthesis. ^[91] Herbert Graham Cannon, a British zoologist, defended Lamarckism in his 1959 book Lamarck and Modern Genetics. ^[92] In the 1960s, "biochemical Lamarckism" was advocated by the embryologist Paul Wintrebert. ^[93]

Neo-Lamarckism was dominant in French biology for more than a century. French scientists who supported neo-Lamarckism included Edmond Perrier (1844–1921), Alfred Giard (1846–1908), Gaston Bonnier (1853–1922) and Pierre-Paul Grassé (1895–1985). They followed two traditions, one mechanistic, one vitalistic after Henri Bergson's philosophy of evolution. ^[94]

In 1987, Ryuichi Matsuda coined the term "pan-environmentalism" for his evolutionary theory which he saw as a fusion of Darwinism with neo-Lamarckism. He held that heterochrony is a main mechanism for evolutionary change and that novelty in evolution can be generated by genetic assimilation. ^{[95] [96]} His views were criticized by Arthur M. Shapiro for providing no solid evidence for his theory. Shapiro noted that "Matsuda himself accepts too much at face value and is prone to wish-fulfilling interpretation." ^[96]

Ideological neo-Lamarckism

Trofim Lysenko promoted an ideological form of neo-Lamarckism which adversely influenced Soviet agricultural policy in the 1930s.

Main article: Lysenkoism

A form of Lamarckism was revived in the Soviet Union of the 1930s when Trofim Lysenko promoted the ideologically driven research programme, Lysenkoism; this suited the ideological opposition of Joseph Stalin to genetics. Lysenkoism influenced Soviet agricultural policy which in turn was later blamed for the numerous massive crop failures experienced within Soviet states. ^[97]

Critique

George Gaylord Simpson in his book Tempo and Mode in Evolution (1944) claimed that experiments in heredity have failed to corroborate any Lamarckian process. ^[98] Simpson noted that neo-Lamarckism "stresses a factor that Lamarck rejected: inheritance of direct effects of the environment" and neo-Lamarckism is closer to Darwin's pangenesis than Lamarck's views. ^[99] Simpson wrote, "the inheritance of acquired characters, failed to meet the tests of observation and has been almost universally discarded by biologists." ^[100]

Zirkle pointed out that Lamarck did not originate the hypothesis that acquired characteristics could be inherited, so it is incorrect to refer to it as Lamarckism:

What Lamarck really did was to accept the hypothesis that acquired characters were heritable, a notion which had been held almost universally for well over two thousand years and which his contemporaries accepted as a matter of course, and to assume that the results of such inheritance were cumulative from generation to generation, thus producing, in time, new species. His individual contribution to biological theory consisted in his application to the problem of the origin of species of the view that acquired characters were inherited and in showing that evolution could be inferred logically from the accepted biological hypotheses. He would doubtless have been greatly astonished to learn that a belief in the inheritance of acquired characters is now labeled "Lamarckian," although he would almost certainly have felt flattered if evolution itself had been so designated. ^[9]

Peter Medawar wrote regarding Lamarckism, "very few professional biologists believe that anything of the kind occurs—or can occur—but the notion persists for a variety of nonscientific reasons." Medawar stated there is no known mechanism by which an adaptation acquired in an individual's lifetime can be imprinted on the genome and Lamarckian inheritance is not valid unless it excludes the possibility of natural selection, but this has not been demonstrated in any experiment. ^[101]

Martin Gardner wrote in his book Fads and Fallacies in the Name of Science (1957):

A host of experiments have been designed to test Lamarckianism. All that have been verified have proved negative. On the other hand, tens of thousands of experiments— reported in the journals and carefully checked and rechecked by geneticists throughout the world— have established the correctness of the gene-mutation theory beyond all reasonable doubt... In spite of the rapidly increasing evidence for natural selection, Lamarck has never ceased to have loyal followers.... There is indeed a strong emotional appeal in the thought that every little effort an animal puts forth is somehow transmitted to his progeny. ^[102]

According to Ernst Mayr, any Lamarckian theory involving the inheritance of acquired characters has been refuted as "DNA does not directly participate in the making of the phenotype and that the phenotype, in turn, does not control the composition of the DNA." ^[103] Peter J. Bowler has written that although many early scientists took Lamarckism seriously, it was discredited by genetics in the early twentieth century. ^[104]

Mechanisms resembling Lamarckism

Studies in the field of epigenetics, genetics and somatic hypermutation ^{[105] [106]} have highlighted the possible inheritance of traits acquired by the previous generation. ^{[107] [108] [109] [110] [111]} However, the characterization of these findings as Lamarckism has been disputed. ^{[112] [113] [114] [115]}

Transgenerational epigenetic inheritance

DNA molecule with epigenetic marks, created by methylation, enabling a neo-Lamarckian pattern of inheritance for some generations

Further information: Transgenerational epigenetic inheritance and Contribution of epigenetic modifications to evolution

Epigenetic inheritance has been argued by scientists including Eva Jablonka and Marion J. Lamb to be Lamarckian. ^[116] Epigenetics is based on hereditary elements other than genes that pass into the germ cells. These include methylation patterns in DNA and chromatin marks on histone proteins, both involved in gene regulation. These marks are responsive to environmental stimuli, differentially affect gene expression, and are adaptive, with phenotypic effects that persist for some generations. The mechanism may also enable the inheritance of behavioral traits, for example in chickens, ^{[117] [118] [119]} rats ^{[120] [121]} and human populations that have experienced starvation, DNA methylation resulting in altered gene function in both the starved population and their offspring. ^[122] Methylation similarly mediates epigenetic inheritance in plants such as rice. ^{[123] [124]} Small RNA molecules, too, may mediate inherited resistance to infection. ^{[125] [126] [127]} Handel and Ramagopalan commented that "epigenetics allows the peaceful co-existence of Darwinian and Lamarckian evolution." ^[128]

Joseph Springer and Dennis Holley commented in 2013 that: ^[6]

Lamarck and his ideas were ridiculed and discredited. In a strange twist of fate, Lamarck may have the last laugh. Epigenetics, an emerging field of genetics, has shown that Lamarck may have been at least partially correct all along. It seems that reversible and heritable changes can occur without a change in DNA sequence (genotype) and that such changes may be induced spontaneously or in response to environmental factors—Lamarck's "acquired traits." Determining which observed phenotypes are genetically inherited and which are environmentally induced remains an important and ongoing part of the study of genetics, developmental biology, and medicine. ^[6]

The prokaryotic CRISPR system and Piwi-interacting RNA could be classified as Lamarckian, within a Darwinian framework. ^{[129] [130]} However, the significance of epigenetics in evolution is uncertain. Critics such as the evolutionary biologist Jerry Coyne point out that epigenetic inheritance lasts for only a few generations, so it is not a stable basis for evolutionary change. ^{[131] [132] [133] [134]}

The evolutionary biologist T. Ryan Gregory contends that epigenetic inheritance should not be considered Lamarckian. According to Gregory, Lamarck did not claim that the environment directly affected living things. Instead, Lamarck "argued that the environment created needs to which organisms responded by using some features more and others less, that this resulted in those features being accentuated or attenuated, and that this difference was then inherited by offspring." Gregory has stated that Lamarckian evolution in epigenetics is more like Darwin's point of view than Lamarck's. ^[112]

In 2007, David Haig wrote that research into epigenetic processes does allow a Lamarckian element in evolution but the processes do not challenge the main tenets of the modern evolutionary synthesis as modern Lamarckians have claimed. Haig argued for the primacy of DNA and evolution of epigenetic switches by natural selection. ^[135] Haig has written that there is a "visceral attraction" to Lamarckian evolution from the public and some scientists, as it posits the world with a meaning, in which organisms can shape their own evolutionary destiny. ^[136]

Thomas Dickens and Qazi Rahman (2012) have argued that epigenetic mechanisms such as DNA methylation and histone modification are genetically inherited under the control of natural selection and do not challenge the modern synthesis. They dispute the claims of Jablonka and Lamb on Lamarckian epigenetic processes. ^[137]

Edward J. Steele's disputed Neo-Lamarckian mechanism involves somatic hypermutation and reverse transcription by a retrovirus to breach the Weismann barrier to germline DNA.

In 2015, Khursheed Iqbal and colleagues discovered that although "endocrine disruptors exert direct epigenetic effects in the exposed fetal germ cells, these are corrected by reprogramming events in the next generation." ^[139] Also in 2015, Adam Weiss argued that bringing back Lamarck in the context of epigenetics is misleading, commenting, "We should remember [Lamarck] for the good he contributed to science, not for things that resemble his theory only superficially. Indeed, thinking of CRISPR and other phenomena as Lamarckian only obscures the simple and elegant way evolution really works." ^[140]

Somatic hypermutation and reverse transcription to germline

In the 1970s, the Australian immunologist Edward J. Steele developed a neo-Lamarckian theory of somatic hypermutation within the immune system and coupled it to the reverse transcription of RNA derived from body cells to the DNA of germline cells. This reverse transcription process supposedly enabled characteristics or bodily changes acquired during a lifetime to be written back into the DNA and passed on to subsequent generations. ^{[141] [142]}

The mechanism was meant to explain why homologous DNA sequences from the VDJ gene regions of parent mice were found in their germ cells and seemed to persist in the offspring for a few generations. The mechanism involved the somatic selection and clonal amplification of newly acquired antibody gene sequences generated via somatic hypermutation in B-cells. The messenger RNA products of these somatically novel genes were captured by retroviruses endogenous to the B-cells and were then transported through the bloodstream where they could breach the Weismann or soma-germ barrier and reverse transcribe the newly acquired genes into the cells of the germ line, in the manner of Darwin's pangenes. ^{[106] [105] [143]}

Neo-Lamarckian inheritance of hologenome

The historian of biology Peter J. Bowler noted in 1989 that other scientists had been unable to reproduce his results, and described the scientific consensus at the time: ^[138]

There is no feedback of information from the proteins to the DNA, and hence no route by which characteristics acquired in the body can be passed on through the genes. The work of Ted Steele (1979) provoked a flurry of interest in the possibility that there might, after all, be ways in which this reverse flow of information could take place. ... [His] mechanism did not, in fact, violate the principles of molecular biology, but most biologists were suspicious of Steele's claims, and attempts to reproduce his results have failed. ^[138]

Bowler commented that "[Steele's] work was bitterly criticized at the time by biologists who doubted his experimental results and rejected his hypothetical mechanism as implausible." ^[138]

Hologenome theory of evolution

Further information: hologenome theory of evolution

The hologenome theory of evolution, while Darwinian, has Lamarckian aspects. An individual animal or plant lives in symbiosis with many microorganisms, and together they have a "hologenome" consisting of all their genomes. The hologenome can vary like any other genome by mutation, sexual recombination, and chromosome rearrangement, but in addition it can vary when populations of microorganisms increase or decrease (resembling Lamarckian use and disuse), and when it gains new kinds of microorganism (resembling Lamarckian inheritance of acquired characteristics). These changes are then passed on to offspring. ^[7] The mechanism is largely uncontroversial, and natural selection does sometimes occur at whole system (hologenome) level, but it is not clear that this is always the case. ^[144]

Lamarckian use and disuse compared to Darwinian evolution, the Baldwin effect, and Waddington's genetic assimilation. All the theories offer explanations of how organisms respond to a changed environment with adaptive inherited change.

Baldwin effect

Further information: Baldwin effect

The Baldwin effect, named after the psychologist James Mark Baldwin by George Gaylord Simpson in 1953, proposes that the ability to learn new behaviours can improve an animal's reproductive success, and hence the course of natural selection on its genetic makeup. Simpson stated that the mechanism was "not inconsistent with the modern synthesis" of evolutionary theory, ^[145] though he doubted that it occurred very often or could be proven to occur. He noted that the Baldwin effect provided a reconciliation between the neo-Darwinian and neo-Lamarckian approaches, something that the modern synthesis had seemed to render unnecessary. In particular, the effect allows animals to adapt to a new stress in the environment through behavioural changes, followed by genetic change. This somewhat resembles Lamarckism but without requiring animals to inherit characteristics acquired by their parents. ^[146] The Baldwin effect is broadly accepted by Darwinists. ^[147]

In sociocultural evolution

Within the field of cultural evolution, Lamarckism has been applied as a mechanism for dual inheritance theory. ^[148] Gould viewed culture as a Lamarckian process whereby older generations transmitted adaptive information to offspring via the concept of learning. In the history of technology, components of Lamarckism have been used to link cultural development to human evolution by considering technology as extensions of human anatomy. ^[149]

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Further reading

• Barthélemy-Madaule, Madeleine (1982). Lamarck, the Mythical Precursor: A Study of the Relations Between Science and Ideology. English translation by M. H. Shank. MIT Press. ISBN   978-0-262-02179-1. LCCN   82010061. OCLC   8533097. Translation of Lamarck, ou, Le mythe du précurseur (1979)
• Bowler, Peter J. (1989). The Mendelian Revolution: The Emergence of Hereditarian Concepts in Modern Science and Society. Johns Hopkins University Press. ISBN   978-0-8018-3888-0. LCCN   89030914. OCLC   19322402.
• Burkeman, Oliver (19 March 2010). "Why everything you've been told about evolution is wrong". The Guardian .
• Rutherford, Adam (19 March 2010). "Beyond a 'Darwin was wrong' headline". The Guardian.
• Cook, George M. (December 1999). "Neo-Lamarckian Experimentalism in America: Origins and Consequences". The Quarterly Review of Biology . 74 (4): 417–437. doi:10.1086/394112. JSTOR   2664721. PMID   10672643. S2CID   12954177.
• Desmond, Adrian (1989). The Politics of Evolution: Morphology, Medicine, and Reform in Radical London . Science and its Conceptual Foundations. University of Chicago Press. ISBN   978-0-226-14346-0. LCCN   89005137. OCLC   709606191.
• Fecht, Sarah (October 19, 2011). "Longevity Shown for First Time to Be Inherited via a Non-DNA Mechanism". Scientific American . Retrieved 2015-11-05.
• Gissis, Snait B.; Jablonka, Eva., eds. (2011). Transformations of Lamarckism: From Subtle Fluids to Molecular Biology. Vienna Series in Theoretical Biology. Illustrations by Anna Zeligowski. MIT Press. ISBN   978-0-262-01514-1. LCCN   2010031344. OCLC   662152397.
• Honeywill, Ross (2008). Lamarck's Evolution: Two Centuries of Genius and Jealousy. Pier 9. ISBN   978-1-921208-60-7. LCCN   2011431766. OCLC   746154950.
• Jablonka, Eva; Lamb, Marion J. (2008). "The Epigenome in Evolution: Beyond The Modern Synthesis" (PDF). Information Bulletin VOGiS. 12 (1/2): 242–254.
• Medawar, Peter (1990). Pyke, David (ed.). The Threat and the Glory: Reflections on Science and Scientists. Foreword by Lewis Thomas (1st U.S. ed.). HarperCollins. ISBN   978-0-06-039112-6. LCCN   89046107. OCLC   21977349. Contains the BBC Reith Lectures "The Future of Man."
• Molino, Jean (2000). "Toward an Evolutionary Theory of Music and Language". In Wallin, Nils L. [in Swedish]; Merker, Björn; Brown, Steven (eds.). The Origins of Music. MIT Press. pp. 165–176. ISBN   978-0-262-23206-7. LCCN   98054088. OCLC   44963330. "Consists of papers given at a workshop on the origins of music held in Fiesole, Italy, May 1997, the first of a series called Florentine Workshops in Biomusicology."
• Peng, Wayne (December 27, 2011). "Lamarckian viral defense in worms". Nature Genetics . 44: 15. doi: 10.1038/ng.1062 . S2CID   32406225.
• Pennisi, Elizabeth (September 6, 2013). "Evolution Heresy? Epigenetics Underlies Heritable Plant Traits". Science . 341 (6150): 1055. doi:10.1126/science.341.6150.1055. PMID   24009370.
• Persell, Stuart (1999). Neo-Lamarckism and the Evolution Controversy in France, 1870-1920. Studies in French Civilization. Vol. 14. Edwin Mellen Press. ISBN   978-0-7734-8275-3. LCCN   98048633. OCLC   40193707.
• Seki, Yoshiyuki (April 2013). Groszmann, Roberto J.; Iwakiri, Yasuko; Taddei, Tamar H. (eds.). "Serum-mediated transgenerational effects on sperm: Evidence for lamarckian inheritance?". Hepatology . 57 (4): 1663–1665. doi: 10.1002/hep.26240 . PMID   23568276. S2CID   5288601.
• Waddington, Conrad H. (1961). "The Human Evolutionary System". In Banton, Michael (ed.). Darwinism and the Study of Society: A Centenary Symposium; Chicago, IL. Tavistock Publications; Quadrangle Books. LCCN   61007932. OCLC   1003950. "Essays ... based upon papers read at a conference held at the University of Edinburgh ... 1959."
• Ward, Lester Frank (1891). Neo-Darwinism and Neo-Lamarckism. Press of Gedney & Roberts. LCCN   07037459. OCLC   4115244. "Annual address of the president of the Biological Society of Washington. Delivered January 24, 1891. (From the Proceedings, vol. VI.)" Neo-Darwinism and neo-Lamarckism (1891) at the Internet Archive .
• Whitelaw, Emma (February 2006). "Epigenetics: Sins of the fathers, and their fathers". European Journal of Human Genetics . 14 (2): 131–132. doi: 10.1038/sj.ejhg.5201567 . PMID   16421606. S2CID   36863159.
• Yongsheng Liu (September 2007). "Like father like son. A fresh review of the inheritance of acquired characteristics". EMBO Reports . 8 (9): 798–803. doi:10.1038/sj.embor.7401060. PMC   1973965 . PMID   17767188.

External links

• Jean-Baptiste Lamarck (1744-1829) at the University of California Museum of Paleontology