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The God gene hypothesis proposes that human spirituality is influenced by heredity and that a specific gene, called vesicular monoamine transporter 2 (VMAT2), predisposes humans towards spiritual or mystic experiences. [1] The idea has been proposed by geneticist Dean Hamer in the 2004 book called The God Gene: How Faith is Hardwired into our Genes.
The God gene hypothesis is based on a combination of behavioral genetic, neurobiological and psychological studies. [2] The major arguments of the hypothesis are: (1) spirituality can be quantified by psychometric measurements; (2) the underlying tendency to spirituality is partially heritable; (3) part of this heritability can be attributed to the gene VMAT2; (4) this gene acts by altering monoamine levels; and (5) spirituality provides an evolutionary advantage by providing individuals with an innate sense of optimism.
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According to the God Gene hypothesis, spirituality has a genetic component, of which (VMAT2) comprises one component by contributing to sensations associated with mystic experiences, including the presence of God and feelings of connection to a larger universe.
The research uses the self-transcendence scale developed by psychologist Robert Cloninger to quantify spirituality using three sub-scales: "self-forgetfulness" (as in the tendency to become totally absorbed in some activity, such as reading); "transpersonal identification" (a feeling of connectedness to a larger universe); and "mysticism" (an openness to believe things that remain unproven, such as ESP). Cloninger suggests that taken together, these measurements are a reasonable way to quantify (make measurable) an individual's propensity to be spiritual.
The self-transcendence measure was shown to be heritable by classical twin studies conducted by Lindon Eaves and Nicholas Martin. Their work demonstrated that approximately 40% of the variation in self-transcendence was due to genes. By contrast, specific religious beliefs (such as belief in a particular deity) were found to have no genetic basis and are instead cultural units or memes. Similar conclusions were drawn from studies of identical twins reared apart.
In order to identify some of the specific genes involved in self-transcendence, Hamer analyzed DNA and personality score data from over 1,000 individuals and identified one particular locus, VMAT2, with a significant correlation. VMAT2 codes for a vesicular monoamine transporter that plays a key role in regulating the levels of the brain chemicals serotonin, dopamine and norepinephrine. These monoamine transmitters are in turn postulated to play an important role in regulating the brain activities associated with mystic beliefs.
Hamer hypothesized that self-transcendence might provide an evolutionary advantage by providing human beings with an innate sense of optimism that gives people the will to keep on living and procreating, despite the inevitability of death, and promoting better health and recovery from diseases.
In the brain, VMAT2 proteins are located on synaptic vesicles. VMAT2 transports monoamine neurotransmitters from the cytosol of monoamine neurons into vesicles. Developmental biologist and science blogger PZ Myers argues: "It's a pump. A teeny-tiny pump responsible for packaging a neurotransmitter for export during brain activity. Yes, it's important, and it may even be active and necessary during higher order processing, like religious thought. But one thing it isn't is a 'god gene.'" [3]
Popular science writer Carl Zimmer said that VMAT2 can be characterized as a gene that accounts for less than one percent of the variance of self-transcendence scores. These, Zimmer says, can signify anything from belonging to the Green Party to believing in ESP. Zimmer also points out that the God Gene theory is based on only one unpublished, unreplicated study. [4]
However, Hamer notes that the importance of the VMAT2 finding is not that it explains all spiritual or religious feelings, but rather that it points the way toward one neurobiological pathway that may be important. Currently, there are several VMAT2 inhibitors marketed as drugs including deutetrabenazine, tetrabenazine, and valbenazine. [5] The question of the God Gene could be answered by experimental studies.
John Polkinghorne, a theoretical physicist and Anglican priest, member of the Royal Society and Canon Theologian at Liverpool Cathedral, was asked for a comment on Hamer's theory by the British national daily newspaper, The Daily Telegraph . He replied: "The idea of a God gene goes against all my personal theological convictions. You can't cut faith down to the lowest common denominator of genetic survival. It shows the poverty of reductionist thinking." [6] [7]
Walter Houston, the chaplain of Mansfield College, Oxford, and a fellow in theology, told the Telegraph: "Religious belief is not just related to a person's constitution; it's related to society, tradition, character—everything's involved. Having a gene that could do all that seems pretty unlikely to me."
Hamer responded that the existence of such a gene would not be incompatible with the existence of a personal God: "Religious believers can point to the existence of God genes as one more sign of the creator's ingenuity—a clever way to help humans acknowledge and embrace a divine presence." [7] He repeatedly notes in his book that, "This book is about whether God genes exist, not about whether there is a God." [8]
Monoamine neurotransmitters are neurotransmitters and neuromodulators that contain one amino group connected to an aromatic ring by a two-carbon chain (such as -CH2-CH2-). Examples are dopamine, norepinephrine and serotonin.
The Oxford English Dictionary defines religiosity as: "Religiousness; religious feeling or belief. [...] Affected or excessive religiousness". Different scholars have seen this concept as broadly about religious orientations and degrees of involvement or commitment. The contrast between "religious" and "religiose" and the concept of "strengthening" faith suggest differences in the intensity of religiosity.
Monoamine transporters (MATs) are proteins that function as integral plasma-membrane transporters to regulate concentrations of extracellular monoamine neurotransmitters. The three major classes are serotonin transporters (SERTs), dopamine transporters (DATs), and norepinephrine transporters (NETs) and are responsible for the reuptake of their associated amine neurotransmitters. MATs are located just outside the synaptic cleft (peri-synaptically), transporting monoamine transmitter overflow from the synaptic cleft back to the cytoplasm of the pre-synaptic neuron. MAT regulation generally occurs through protein phosphorylation and post-translational modification. Due to their significance in neuronal signaling, MATs are commonly associated with drugs used to treat mental disorders as well as recreational drugs. Compounds targeting MATs range from medications such as the wide variety of tricyclic antidepressants, selective serotonin reuptake inhibitors such as fluoxetine (Prozac) to stimulant medications such as methylphenidate (Ritalin) and amphetamine in its many forms and derivatives methamphetamine (Desoxyn) and lisdexamfetamine (Vyvanse). Furthermore, drugs such as MDMA and natural alkaloids such as cocaine exert their effects in part by their interaction with MATs, by blocking the transporters from mopping up dopamine, serotonin, and other neurotransmitters from the synapse.
The vesicular monoamine transporter (VMAT) is a transport protein integrated into the membranes of synaptic vesicles of presynaptic neurons. It transports monoamine neurotransmitters – such as dopamine, serotonin, norepinephrine, epinephrine, and histamine – into the vesicles, which release the neurotransmitters into synapses, as chemical messages to postsynaptic neurons. VMATs utilize a proton gradient generated by V-ATPases in vesicle membranes to power monoamine import.
Reserpine is a drug that is used for the treatment of high blood pressure, usually in combination with a thiazide diuretic or vasodilator. Large clinical trials have shown that combined treatment with reserpine plus a thiazide diuretic reduces mortality of people with hypertension. Although the use of reserpine as a solo drug has declined since it was first approved by the FDA in 1955, the combined use of reserpine and a thiazide diuretic or vasodilator is still recommended in patients who do not achieve adequate lowering of blood pressure with first-line drug treatment alone. The reserpine-hydrochlorothiazide combo pill was the 17th most commonly prescribed of the 43 combination antihypertensive pills available in 2012.
Dean Hamer is an American geneticist, author, and filmmaker. He is known for his research on the role of genetics in sexual orientation and for a series of popular books and films that have changed scientific and public understandings and perceptions of human sexuality and gender.
In philosophy, transcendence is the basic ground concept from the word's literal meaning, of climbing or going beyond, albeit with varying connotations in its different historical and cultural stages. It includes philosophies, systems, and approaches that describe the fundamental structures of being, not as an ontology, but as the framework of emergence and validation of knowledge of being. These definitions are generally grounded in reason and empirical observation and seek to provide a framework for understanding the world that is not reliant on religious beliefs or supernatural forces. "Transcendental" is a word derived from the scholastic, designating the extra-categorical attributes of beings.
Phenmetrazine, sold under the brand name Preludin among others, is a stimulant drug first synthesized in 1952 and originally used as an appetite suppressant, but withdrawn from the market in the 1980s due to widespread misuse. It was initially replaced by its analogue phendimetrazine which functions as a prodrug to phenmetrazine, but now it is rarely prescribed, due to concerns of misuse and addiction. Chemically, phenmetrazine is a substituted amphetamine containing a morpholine ring or a substituted phenylmorpholine.
The solute carrier family 18 member 2 (SLC18A2) also known as vesicular monoamine transporter 2 (VMAT2) is a protein that in humans is encoded by the SLC18A2 gene. SLC18A2 is an integral membrane protein that transports monoamines—particularly neurotransmitters such as dopamine, norepinephrine, serotonin, and histamine—from cellular cytosol into synaptic vesicles. In nigrostriatal pathway and mesolimbic pathway dopamine-releasing neurons, SLC18A2 function is also necessary for the vesicular release of the neurotransmitter GABA.
Vesicular monoamine transporter 1 (VMAT1) also known as chromaffin granule amine transporter (CGAT) or solute carrier family 18 member 1 (SLC18A1) is a protein that in humans is encoded by the SLC18A1 gene. VMAT1 is an integral membrane protein, which is embedded in synaptic vesicles and serves to transfer monoamines, such as norepinephrine, epinephrine, dopamine, and serotonin, between the cytosol and synaptic vesicles. SLC18A1 is an isoform of the vesicular monoamine transporter.
Solute carrier family 22 member 3 (SLC22A3) also known as the organic cation transporter 3 (OCT3) or extraneuronal monoamine transporter (EMT) is a protein that in humans is encoded by the SLC22A3 gene.
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