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Researchers at Weill Cornell Medicine Qatar (WCM-Q) have helped to shine a light on traits that are associated with various degrees of consanguineous marriage.With funding from the Biomedical Research Program at WCM-Q, Dr. Steven C. Hunt, professor of genetic medicine, and Dr. Noha A. Yousri, adjunct assistant professor of research in genetic medicine, participated in a large meta-analysis with hundreds of scientists from across the globe, studying genetic variations in more than 1.4 million individuals.Dr. Yousri said: Very large numbers of samples are required to study the impact of marriage between men and women from the same extended families. This study conducted a meta-analysis of results from 119 independent cohorts to quantify the effect of consanguineous marriages on 45 commonly measured complex traits of biomedical or evolutionary importance, and an additional 55 more rarely measured traits included in the UK Biobank. Complex traits were arranged into 16 groups covering major organ systems and disease risk factors were analyzed.

Genetic associations with 32 of 100 studied traits and conditions in humans were identified by using runs of homozygosity (ROH). ROH refers to long continuous segments of identical alleles (homozygosity) along both inherited chromosomes. ROH arise through consanguineous marriages, i.e., when both parents are related through a common ancestor. The net directional effect of all recessive variants on traits is quantified and related to the 100 traits and conditions

Dr. Hunt said: Runs of rare recessive variants inherited through these types of unions were shown to reduce reproductive fitness or fertility, with a 55% reduction in the odds of having children. ROH were also associated with decreased height, increased waist to hip ratio, decreased lung function, and reduced educational attainment.

Dr. Yousri said: The most important aspect of this study is finding the traits affected by consanguineous marriages. Given that this type of marriage is relatively common in Qatar, it would be beneficial to investigate whether those results might apply to Qatar, as it might help us better understand the implications.The full study, which was led by Professor James F. Wilson and his group from the University of Edinburgh, has been published in the high impact journal Nature Communications, and can be read at https://www.nature.com/articles/s41467-019-12283-6.

Dr. Yousri is also collaborating on a related study with Sidra Medicine called The PMED-Qatar Study: Personalized Molecular Evaluation and Diagnosis for Rare Diseases in Qatar, which is being funded by Qatar National Research Fund under the project number NPRP11S-0110-180250.

See more here:
Scientists at WCM-Q Examine the Implications of Consanguineous Marriage - Al-Bawaba

This entry was posted on August 16, 2020 at 12:57 am and is filed under Genetic medicine. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed. |