ABCC11 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Aliases | ABCC11 , ATP-binding cassette, sub-family C (CFTR/MRP), member 11, EWWD, MRP8, WW, ATP binding cassette subfamily C member 11, ATP-binding cassette transporter sub-family C member 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||
External IDs | OMIM: 607040; HomoloGene: 69511; GeneCards: ABCC11; OMA:ABCC11 - orthologs | ||||||||||||||||||||||||||||||||||||||||||||||||||
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You can help expand this article with text translated from the corresponding article in German. (October 2018)Click [show] for important translation instructions.
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ATP-binding cassette transporter sub-family C member 11, also MRP8 (Multidrug Resistance-Related Protein 8), is a membrane transporter that exports certain molecules from inside a cell. It is a protein that in humans is encoded by gene ABCC11. [3] [4] [5]
The gene is responsible for determination of human cerumen type (wet or dry ear wax) and presence of underarm osmidrosis (odor associated with sweat caused by apocrine secretion), and is associated with colostrum secretion. [6]
The protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). The ABCC11 transporter is a member of the MRP subfamily which is involved in multi-drug resistance. The product of this gene participates in physiological processes involving bile acids, conjugated steroids, and cyclic nucleotides. In addition, a single nucleotide polymorphism (SNP) in this gene is responsible for determination of human earwax type and presence of underarm odour. This gene and family member ABCC12 are determined to be derived by duplication and are both localized to chromosome 16q12.1. Multiple alternatively spliced transcript variants have been described for this gene. [5]
The ABCC11 gene is present in the human genome as two alleles, differing in one nucleotide also known as a single nucleotide polymorphism (SNP). [7] A SNP in the ABCC11 gene on chromosome 16 at base position 538 of either a guanine or adenine determines two distinct groups of phenotypes. [7] [8] These respectively code for glycine and arginine in the gene's protein product. Dominant inheritance of the GG or GA genotype is observed while the AA genotype is recessive. The phenotypes expressed by the genotypes include cerumen type (wet or dry ear wax), osmidrosis (odor associated with sweat caused by excessive apocrine secretion), and possibly breast cancer risk, although there is ongoing debate on whether there is a real correlation of the wet ear wax phenotype to breast cancer susceptibility. [9] [10] The GG or GA genotype produces the wet ear wax phenotype (sticky and brown colored) and acrid sweat odor and is the dominant allele. [9] Note this phenotype requires only the presence of one guanine. The homozygous recessive AA genotype produces the dry ear wax phenotype (dry and flaky) and mildly odored sweat. [9]
The alleles containing a guanine produce a protein that is glycosylated but alleles containing an adenine are not glycosylated. The resulting protein is only partially degraded by proteasomes. [7] This effect is localized to ceruminous gland membranes. [7] Because the adenine containing allele protein product is only partially degraded, the remaining functional protein is located on the cell surface membrane which ABCC11 gene's role in sweat odor is likely in part due to the quantitative dosage of ABCC11 protein. [7]
From an evolutionary perspective, the implications of cerumen type on fitness are unknown. However, odorless sweat in ancient Northern Eurasian populations has been postulated to have an adaptive advantage for cold weather. [8] In some nonhuman mammals, mating signals via release of an odor enhanced by increased apocrine secretion may be a factor in sexual selection. [8]
Physical human traits that are controlled by a single gene are uncommon. Most human characteristics are controlled by multiple genes (polygenes); ABCC11 is a peculiar example of a gene with unambiguous phenotypes that is controlled by a SNP. Additionally, it is considered a pleiotropic gene.
The history of the migration of humans can be traced back using the ABCC11 gene alleles. The variation between ear wax in ethnicities around the world are specifically due to the ABCC11 gene alleles. [8] It is believed that the derived allele originated in an ancient East Asian population. [11] The gene may have spread as a result of it being a beneficial adaption or through an evolutionary neutral mutation mechanism that went through genetic drift events, or through sexual selection. [12]
An analysis of ancient DNA of Eastern European hunter gatherers, Scandinavian Hunter Gatherers, Western Hunter Gatherers and Early European Farmers. The study found that the derived allele of ABCC11 associated with dry earwax and reduced body odor was absent in all European hunter gatherers, except for a Western Hunter Gatherer from Mesolithic central Europe. The derived allele was absent in the paleolithic hunter gatherer Kostenki 14, who is deeply related to Ancient North Eurasians. [13]
The frequency of alleles for dry ear wax is most concentrated in East Asia; most notably China, Japan, Korea, and Mongolia. The allele frequency is highest among the northern Han Chinese and Koreans; followed by Mongols, southern Han Chinese, and Yamatos, respectively. The frequency is low among the Ryukyuans and Ainu. [8] The derived allele is not rare in South Asia, with 54% of Dravidian people from Tamil Nadu carrying an AA genotype. [8] A downward gradient of dry ear wax allele phenotypes can be drawn from northern China to southern Asia and an east–west gradient can also be drawn from eastern Siberia to western Europe. [8] The allele frequencies within ethnicities continued to be maintained because the ABCC11 gene is inherited as a haplotype, a group of genes or alleles that tend to be inherited as a single unit. [8] [14]
The amount of volatile organic compounds (VOCs) in ear wax was found to be related to variation in ABCC11 genotype, which in turn is dependent on ethnic origin. In particular, the rs17822931 genotype, which is especially prevalent in East Asians, is correlated with lower VOC levels. However, VOC levels were not found to vary significantly qualitatively nor quantitatively for most organic compounds by racial group after Bonferroni corrections, suggesting that it does not result in ethnic differences. [15]
Earwax, also known by the medical term cerumen, is a waxy substance secreted in the ear canal of humans and other mammals. Earwax can be many colors, including brown, orange, red, yellowish, and gray. Earwax protects the skin of the human ear canal, assists in cleaning and lubrication, and provides protection against bacteria, fungi, particulate matter, and water.
Body odor or body odour (BO) is present in all animals and its intensity can be influenced by many factors. Body odor has a strong genetic basis, but can also be strongly influenced by various factors, such as sex, diet, health, and medication. The body odor of human males plays an important role in human sexual attraction, as a powerful indicator of MHC/HLA heterozygosity. Significant evidence suggests that women are attracted to men whose body odor is different from theirs, indicating that they have immune genes that are different from their own, which may produce healthier offspring.
The ABC transporters, ATP synthase (ATP)-binding cassette transporters are a transport system superfamily that is one of the largest and possibly one of the oldest gene families. It is represented in all extant phyla, from prokaryotes to humans. ABC transporters belong to translocases.
P-glycoprotein 1 also known as multidrug resistance protein 1 (MDR1) or ATP-binding cassette sub-family B member 1 (ABCB1) or cluster of differentiation 243 (CD243) is an important protein of the cell membrane that pumps many foreign substances out of cells. More formally, it is an ATP-dependent efflux pump with broad substrate specificity. It exists in animals, fungi, and bacteria, and it likely evolved as a defense mechanism against harmful substances.
Multidrug resistance-associated protein 6 (MRP6) also known as ATP-binding cassette sub-family C member 6 (ABCC6) and multi-specific organic anion transporter E (MOAT-E) is a protein that in humans is encoded by the ABCC6 gene. The protein encoded by the ABCC6 gene is a member of the superfamily of ATP-binding cassette (ABC) transporters.
ATP-binding cassette sub-family C member 4 (ABCC4), also known as the multidrug resistance-associated protein 4 (MRP4) or multi-specific organic anion transporter B (MOAT-B), is a protein that in humans is encoded by the ABCC4 gene.
ATP-binding cassette super-family G member 2 is a protein that in humans is encoded by the ABCG2 gene. ABCG2 has also been designated as CDw338. ABCG2 is a translocation protein used to actively pump drugs and other compounds against their concentration gradient using the bonding and hydrolysis of ATP as the energy source.
Multidrug resistance-associated protein 1 (MRP1) is a protein that in humans is encoded by the ABCC1 gene.
In enzymology, a xenobiotic-transporting ATPase (EC 3.6.3.44) is an enzyme that catalyzes the chemical reaction
Multidrug resistance-associated protein 2 (MRP2) also called canalicular multispecific organic anion transporter 1 (cMOAT) or ATP-binding cassette sub-family C member 2 (ABCC2) is a protein that in humans is encoded by the ABCC2 gene.
Canalicular multispecific organic anion transporter 2 is a protein that in humans is encoded by the ABCC3 gene.
Multidrug resistance-associated protein 5 is a protein that in humans is encoded by the ABCC5 gene.
ATP-binding cassette sub-family G member 8 is a protein that in humans is encoded by the ABCG8 gene.
ATP-binding cassette sub-family B member 9 is a protein that in humans is encoded by the ABCB9 gene.
ATP-binding cassette sub-family A member 3 is a protein that in humans is encoded by the ABCA3 gene.
ATP-binding cassette super-family B member 6, mitochondrial is a protein that in humans is encoded by the ABCB6 gene.
Multidrug resistance-associated protein 7 is a protein that in humans is encoded by the ABCC10 gene.
ATP-binding cassette sub-family D member 4 is a protein that in humans is encoded by the ABCD4 gene.
Multidrug resistance-associated protein 9 is a protein that in humans is encoded by the ABCC12 gene.
The biochemistry of body odor pertains to the chemical compounds in the body responsible for body odor and their kinetics.