Genomic imprinting is an epigenetic phenomenon that causes genes to be expressed or not, depending on whether they are inherited from the mother or the father. Genes can also be partially imprinted. Partial imprinting occurs when alleles from both parents are differently expressed rather than complete expression and complete suppression of one parent's allele. Forms of genomic imprinting have been demonstrated in fungi, plants and animals. In 2014, there were about 150 imprinted genes known in mice and about half that in humans. As of 2019, 260 imprinted genes have been reported in mice and 228 in humans.
Selfish genetic elements are genetic segments that can enhance their own transmission at the expense of other genes in the genome, even if this has no positive or a net negative effect on organismal fitness. Genomes have traditionally been viewed as cohesive units, with genes acting together to improve the fitness of the organism. However, when genes have some control over their own transmission, the rules can change, and so just like all social groups, genomes are vulnerable to selfish behaviour by their parts.
The Y chromosome is one of two sex chromosomes in therian mammals and other organisms. Along with the X chromosome, it is part of the XY sex-determination system, in which the Y is the sex-determining because it is the presence or absence of Y chromosome that determines the male or female sex of offspring produced in sexual reproduction. In mammals, the Y chromosome contains the SRY gene, which triggers development of male gonads. The Y chromosome is passed only from male parents to male offspring.
Genetic variation is the difference in DNA among individuals or the differences between populations among the same species. The multiple sources of genetic variation include mutation and genetic recombination. Mutations are the ultimate sources of genetic variation, but other mechanisms, such as genetic drift, contribute to it, as well.
Parent–offspring conflict (POC) is an expression coined in 1974 by Robert Trivers. It is used to describe the evolutionary conflict arising from differences in optimal parental investment (PI) in an offspring from the standpoint of the parent and the offspring. PI is any investment by the parent in an individual offspring that decreases the parent's ability to invest in other offspring, while the selected offspring's chance of surviving increases.
Intragenomic conflict refers to the evolutionary phenomenon where genes have phenotypic effects that promote their own transmission in detriment of the transmission of other genes that reside in the same genome. The selfish gene theory postulates that natural selection will increase the frequency of those genes whose phenotypic effects cause their transmission to new organisms, and most genes achieve this by cooperating with other genes in the same genome to build an organism capable of reproducing and/or helping kin to reproduce. The assumption of the prevalence of intragenomic cooperation underlies the organism-centered concept of inclusive fitness. However, conflict among genes in the same genome may arise both in events related to reproduction and altruism.
Noninvasive genotyping is a modern technique for obtaining DNA for genotyping that is characterized by the indirect sampling of specimen, not requiring harm to, handling of, or even the presence of the organism of interest. Beginning in the early 1990s, with the advent of PCR, researchers have been able to obtain high-quality DNA samples from small quantities of hair, feathers, scales, or excrement. These noninvasive samples are an improvement over older allozyme and DNA sampling techniques that often required larger samples of tissue or the destruction of the studied organism. Noninvasive genotyping is widely utilized in conservation efforts, where capture and sampling may be difficult or disruptive to behavior. Additionally, in medicine, this technique is being applied in humans for the diagnosis of genetic disease and early detection of tumors. In this context, invasivity takes on a separate definition where noninvasive sampling also includes simple blood samples.
Keith Stewart Thomson was from 2003 to 2012 a senior research fellow of the American Philosophical Society and is, starting in 2012, the Executive Officer of the American Philosophical Society and is an emeritus professor of natural history at the University of Oxford. He was appointed director of the Oxford University Museum of Natural History in July 1998. In 1987 he was appointed president of the Academy of Natural Sciences in Philadelphia. He had earlier been a dean at Yale University and director of Yale's Peabody Museum of Natural History. He is the author of several books and essays that deal with paleontology, the history of science and evolution.
The fetal membranes are the four extraembryonic membranes, associated with the developing embryo, and fetus in humans and other mammals. They are the amnion, chorion, allantois, and yolk sac. The amnion and the chorion are the chorioamniotic membranes that make up the amniotic sac which surrounds and protects the embryo. The fetal membranes are four of six accessory organs developed by the conceptus that are not part of the embryo itself, the other two are the placenta, and the umbilical cord.
Aravinda Chakravarti is a human geneticist and expert in computational biology, and Director of the Center For Human Genetics & Genomics at New York University. He was the 2008 President of the American Society of Human Genetics. Chakravarti became a co-Editor-in-Chief of the journal Genome Research in 1995, and of the Annual Review of Genomics and Human Genetics' in 2005.
Laurence Daniel Hurst is a Professor of Evolutionary Genetics in the Department of Biology and Biochemistry at the University of Bath and the director of the Milner Centre for Evolution.
Cell-free fetal DNA (cffDNA) is fetal DNA that circulates freely in the maternal blood. Maternal blood is sampled by venipuncture. Analysis of cffDNA is a method of non-invasive prenatal diagnosis frequently ordered for pregnant women of advanced maternal age. Two hours after delivery, cffDNA is no longer detectable in maternal blood.
Wolf Reik FRS is a German molecular biologist and a group leader at the Babraham Institute, honorary professor of Epigenetics at the University of Cambridge and associate faculty at the Wellcome Trust Sanger Institute. He was announced as the director of Altos Labs Cambridge Institute when the company launched on 19 January 2022.
Jennifer Lucy Hochschild is an American political scientist. She serves as the Henry LaBarre Jayne Professor of Government, Professor of African and African American Studies and Harvard College Professor at Harvard University. She is also a member of the faculty at Harvard's Graduate School of Education and John F. Kennedy School of Government.
Anne Carla Ferguson-Smith is a mammalian developmental geneticist. She is the Arthur Balfour Professor of Genetics and Pro-Vice Chancellor for Research and International Partnerships at the University of Cambridge. Formerly head of the Department of Genetics at the University of Cambridge, she is a Fellow of Darwin College, Cambridge and serves as President of the Genetics Society.
Intragenomic and intrauterine conflicts in humans arise between mothers and their offspring. Parental investment theory states that parents and their offspring will often be in conflict over the optimal amount of investment that the parent should provide. This is because the best interests of the parent do not always match the best interests of the offspring. Maternal-infant conflict is of interest due to the intensity of maternal investment in her offspring. In humans, mothers often invest years of care into their children due to the long developmental period before children become self-sufficient.
David P. Mindell is an American evolutionary biologist and author. He is currently a senior researcher at the University of California, Berkeley, Museum of Vertebrate Zoology. Mindell's work is focused on the systematics, conservation and molecular evolution of birds, especially birds of prey. He is known for his 2006 book, The Evolving World in which he explained, for the general public, how evolution applies to everyday life.
In genomics, the postgenomic era refers to the time period from after the completion of the Human Genome Project to the present day. The name refers to the fact that the genetic epistemology of contemporary science has progressed beyond the gene-centered view of the earlier genomic era. It is defined by the widespread availability of both the human genome sequence and of the complete genomes of many reference organisms.
Yi Zhang is a Chinese-American biochemist who specializes in the fields of epigenetics, chromatin, and developmental reprogramming. He is a Fred Rosen Professor of Pediatrics and professor of genetics at Harvard Medical School, a senior investigator of Program in Cellular and Molecular Medicine at Boston Children's Hospital, and an investigator of the Howard Hughes Medical Institute. He is also an associate member of the Harvard Stem Cell Institute, as well as the Broad Institute of MIT and Harvard. He is best known for his discovery of several classes of epigenetic enzymes and the identification of epigenetic barriers of SCNT cloning.
Memory Lands: King Philip's War and the Place of Violence is a 2018 book by Williams College history professor Christine DeLucia. The book was published by Yale University Press's Henry Roe Cloud Series on American Indians and Modernity. It looks at over three hundred years of Indigenous history from King Philip's War to the present day, mostly in the North American Northeast, as well as in Bermuda. The book focuses on the role of place and details the continued presence of Indigenous peoples and memory in Bastoniak (Boston), Narragansett, along the middle of the Kwinitekw Valley, and Bermuda.
