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X-Y crossing over in the chimpanzee
B Weber1, J Weissenbach, W Schempp
1Institut für Humangenetik und Anthropologie der Universität, Freiburg i. Br., Federal Republic of Germany.
Human Genetics
|November 1, 1988
Summary
Chimpanzee sex chromosomes share highly conserved pseudoautosomal regions with humans. These homologous segments undergo genetic recombination during male meiosis, indicating shared evolutionary history.
Area of Science:
- Genetics
- Evolutionary Biology
- Comparative Genomics
Background:
- Pseudoautosomal regions (PARs) are homologous segments on sex chromosomes that undergo recombination.
- Understanding PAR conservation across species provides insights into sex chromosome evolution.
Purpose of the Study:
- To investigate the presence and characteristics of pseudoautosomal regions on chimpanzee sex chromosomes.
- To compare these regions with those found in humans and other mammals.
Main Methods:
- Analysis of single-copy DNA sequences from human pseudoautosomal loci in the chimpanzee genome.
- Segregation analysis of polymorphic pseudoautosomal probes in a chimpanzee pedigree.
- In situ hybridization to localize specific pseudoautosomal probes on chimpanzee sex chromosomes.
Main Results:
- High conservation of human pseudoautosomal DNA sequences in the chimpanzee genome.
- Evidence of recombination between pseudoautosomal regions on chimpanzee X and Y chromosomes during male meiosis.
- Localization of the pseudoautosomal probe 29C1 to specific regions on both X and Y chromosomes (Xp22-Xpter and Yq12.2-Yqter).
Conclusions:
- The chimpanzee possesses homologous pseudoautosomal segments on its X and Y chromosomes.
- These segments are conserved and undergo meiotic recombination, similar to humans and mice.
- This finding supports the evolutionary conservation of pseudoautosomal regions in mammals.