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Sex differences in mutation rate in higher primates estimated from AMG intron sequences
1Human Genetics Center, SPH, University of Texas, P.O. Box 20334, Houston, TX 77225, USA.
Journal of Molecular Evolution
|April 1, 1997
Summary
Male primates have a mutation rate over five times higher than females, a finding consistent across multiple gene studies. This sex difference in mutation rate is more pronounced in higher primates compared to rodents.
Area of Science:
- Evolutionary biology
- Genetics
- Primate genomics
Background:
- Sex-specific mutation rates are a key factor in evolutionary processes.
- Understanding these differences can illuminate genome evolution and disease susceptibility.
Purpose of the Study:
- To investigate and quantify sex differences in germline mutation rates across primate species.
- To compare mutation rate ratios between primates and other mammals like rodents.
Main Methods:
- Sequencing of specific gene introns (AMGX/AMGY, ZFX/ZFY, SMCX/SMCY) in humans, orangutans, and squirrel monkeys.
- Estimation of the male-to-female mutation rate ratio (alpha) using comparative genomic data.
Main Results:
- The male-to-female mutation rate ratio (alpha) was estimated at 5.14 (95% CI: 2.42, 16.6) for AMGX/AMGY introns.
- Combining data from multiple gene families yielded a refined alpha estimate of 5.06 (95% CI: 3.24, 8.79).
- This ratio is significantly higher in higher primates than previously observed in rodents.
Conclusions:
- Male germline mutation rates are substantially higher than female rates in primates.
- The observed sex bias in mutation rates is more pronounced in primates than in rodents, suggesting evolutionary divergence.
- These findings have implications for understanding genetic variation, inheritance patterns, and evolutionary trajectories in primates.