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Evolutionary pattern of gene homogenization between primate-specific paralogs after human and macaque speciation
Kiyoshi Ezawa1, Kazuho Ikeo, Takashi Gojobori
1Division of Population Genetics, National Institute of Genetics, Mishima, Japan.
Molecular Biology and Evolution
|May 1, 2010
Summary
Gene homogenization, crucial for gene family evolution, was studied in primates and rodents. Primate gene homogenization is less prevalent than rodent gene homogenization, influenced by physical distance and evolutionary rates.
Area of Science:
- Evolutionary genetics
- Comparative genomics
Background:
- Homogenization of duplicated genes plays a key role in gene family evolution.
- Previous work developed the 4-2-4 method for sensitive detection of partial gene homogenization using quartets.
Purpose of the Study:
- To investigate the prevalence and characteristics of gene homogenization in primate-specific paralogs.
- To compare gene homogenization patterns between primates and rodents.
Main Methods:
- Utilized the 4-2-4 method to analyze gene quartets from human and macaque genomes.
- Compared findings with existing data from mouse and rat genomes.
- Performed statistical analyses to assess correlations with sequence divergence, physical distance, and transcriptional orientation.
Main Results:
- Identified 430 primate-specific paralog quartets, with a homogenization prevalence of 10.0%.
- Primate homogenization prevalence is approximately one-third of that observed in rodents (29.8%).
- Homogenization prevalence negatively correlates with physical distance in both primates and rodents, and is not significantly correlated with transcriptional orientation.
- Gene conversion is identified as the primary mechanism of homogenization in human-macaque quartets.
Conclusions:
- Gene homogenization prevalence differs significantly between primate and rodent lineages, influenced by factors like physical gene location and neutral evolutionary rates.
- Physical distance is a significant factor influencing gene homogenization, while transcriptional orientation is not.
- Gene conversion is the predominant driver of gene homogenization in primates.
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