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Evidence for extensive transmission distortion in the human genome
Sebastian Zöllner1, Xiaoquan Wen, Neil A Hanchard
1Department of Human Genetics, University of Chicago, Chicago, IL 60637, USA.
American Journal of Human Genetics
|December 19, 2003
Summary
Genetic transmission from parents to offspring deviates from Mendel's laws due to biological processes. Our study found a slight but significant excess of genetic sharing among siblings, impacting inheritance understanding.
Area of Science:
- Genetics
- Molecular Biology
- Evolutionary Biology
Background:
- Mendel's laws predict equal parental chromosome transmission.
- Biological processes like meiotic drive can skew transmission probabilities.
- The impact of these processes on mammalian inheritance is not well understood.
Purpose of the Study:
- To investigate deviations from Mendelian transmission proportions in human genetic data.
- To assess the genome-wide impact of skewed transmission on sibling genetic sharing.
Main Methods:
- Analysis of genome screen data from 148 nuclear families.
- Application of single-point and multipoint linkage analysis.
- Examination of transmission proportions without phenotype reference.
Main Results:
- A modest but statistically significant genome-wide excess of genetic sharing among siblings was detected (average sharing 50.43% for autosomes; P=.009).
- The observed shift suggests the involvement of numerous loci exhibiting skewed transmission.
- Skewed transmission loci are under strong evolutionary selection, posing questions about their polymorphism maintenance.
Conclusions:
- Biological processes significantly influence human inheritance patterns beyond Mendelian predictions.
- The findings have implications for understanding evolutionary forces, mapping disease genes, and the genetics of fertility.
- Further research is needed to elucidate the mechanisms and evolutionary consequences of transmission distortion.