Meiotic recombination events are distributed unevenly along the chromosomes and are regulated by genetic background and sex. The goal of this project is to determine the factors regulating sex specificity of meiotic recombination, boh its regional distribution along the chromosomes and the activity of sex-specific recombination hotspots. We will search for both dominant and recessive trans-acting genes that differ between two mouse strains and affect sex specificity of hotspots Esrrg-1 and Tmem182. Hotspot Esrrg-1 has the same activity in females, but is two-fold more active in male B6xCAST than in WSBxCAST. Hotspot Tmem182 is dependent on PWD genetic background and is two-fold more active in female B6xPWD compared to WSBxPWD, but the reverse is true in males. We will use genetic crosses that will allow us to assess dominance issues and dosage effects separately, for which we will create new genetic resources by developing two new mouse strains on a B6 genetic background combining knockin alleles of the recombination positioning gene Prdm9 created for this study with CAST or PWD sequences on Chr1. We will test for hotspot activity in sperm and eggs of individual animals using a newly developed massive parallel sequencing assay. We will also characterize in detail the sex-specific effect of mTert(-/-) telomere shortenin on genome-wide, regional and local recombination rates by comparing two genetic crosses on the same genetic background but differing in their telomeric lengths.

Public Health Relevance

In humans, changes in regional patterns of recombination influence susceptibility to aneuploidy in a sex- specific manner and are major causes for sterility miscarriage and birth defects, and improper recombination can cause genome instability and chromosome rearrangements leading to genetic disorders. The proposed work will have significant, immediate applications in mapping genes underlying any disease with a significant genetic component, both in humans and experimental animals, and will help to improve our understanding of processes leading to development of genetically influenced human diseases, such as cancer and infertility.

National Institute of Health (NIH)
National Institute of General Medical Sciences (NIGMS)
Research Project (R01)
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Genomics, Computational Biology and Technology Study Section (GCAT)
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Janes, Daniel E
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Jackson Laboratory
Bar Harbor
United States
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Baker, Christopher L; Walker, Michael; Kajita, Shimpei et al. (2014) PRDM9 binding organizes hotspot nucleosomes and limits Holliday junction migration. Genome Res 24:724-32
Billings, Timothy; Sargent, Evelyn E; Szatkiewicz, Jin P et al. (2010) Patterns of recombination activity on mouse chromosome 11 revealed by high resolution mapping. PLoS One 5:e15340
Parvanov, Emil D; Petkov, Petko M; Paigen, Kenneth (2010) Prdm9 controls activation of mammalian recombination hotspots. Science 327:835
Parvanov, Emil D; Ng, Siemon H S; Petkov, Petko M et al. (2009) Trans-regulation of mouse meiotic recombination hotspots by Rcr1. PLoS Biol 7:e36
Paigen, Kenneth; Szatkiewicz, Jin P; Sawyer, Kathryn et al. (2008) The recombinational anatomy of a mouse chromosome. PLoS Genet 4:e1000119