Genetic benefits of consanguinity through selection of genotypes protective against malaria.

Genetic benefits of consanguinity through selection of genotypes protective against malaria. Research Abstract Details 

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Genetic benefits of consanguinity through selection of genotypes protective against malaria. Abstract Text:

Srdjan Denic,Michael Gary Nicholls,Srdjan Denic,Michael Gary Nicholls,

Consanguineous marriages are usually socially driven and can be genetically harmful. The detrimental effects of inbreeding are the consequence of homozygosity of harmful genes. On the other hand, beneficial effects of inbreeding, theoretically, could be expected in those who are homozygous for protective recessive and codominant genes. Here, we argue that the most common monogenetic conditions in humans, namely, alpha-thalassemia, glucose-6-phosphate dehydrogenase (G6PD) deficiency, hemoglobin C, and Duffy antigen negative red blood cells, which have evolved under pressure from malaria, had their survival and selection enhanced by consanguineous marriages in malaria-infested regions of the world. This hypothesis is supported by several observations. First, the presence of two mutations in homozygotes involving the listed conditions (except G6PD deficiency) imparts better protection against malaria than the presence of one or no mutation (heterozygous or normal genotypes, respectively); consanguinity increases the number of homozygotes, especially at low allele frequency. For G6PD deficiency, inbreeding could increase the allele frequency of the G6PD-deficient allele. Second, there is overlap between, on the one hand, the geographic distributions of malaria, thalassemias, and other red blood cell conditions that protect against malaria and, on the other hand, consanguineous marriages. Third, the distribution of different intensities of malaria infestation is matched with the frequency of human inbreeding. These observations, taken together, offer strong support to the hypothesis that the culture of consanguineous marriages and the genetics of protection against malaria have co-evolved by fostering survival against malaria through better retention of protective genes in the extended family.

Genetic benefits of consanguinity through selection of genotypes protective against malaria. Publishing Authors By Initials

S Denic,MG Nicholls,S Denic,MG Nicholls,

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Genetic benefits of consanguinity through selection of genotypes protective against malaria. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Human biology; an international record of research

VOLUME: 79

Page Numbers: 145-58

Journal Abbreviation: Hum. Biol.

ISSN: 0018-7143

DAY: 21

MONTH: Apr

YEAR: 2007

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LANGUAGE: eng

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Grant and Affiliation Information for Genetic benefits of consanguinity through selection of genotypes protective against malaria.

AFFILIATION: Department of Internal Medicine, Faculty of Medicine and Health Sciences, UAE University, PO Box 17666, Al Ain, United Arab Emirates.

Country: United States

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MEDLINETA: Hum Biol

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