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Sex-specific crossover patterns in Zebrafish (Danio rerio).

N Kochakpour¹, P B Moens

¹Department of Biology, York University, Toronto, Ontario, Canada. nazfarin@yorku.ca

|March 7, 2008

Summary

Zebrafish (Danio rerio) males exhibit lower meiotic recombination rates than females. This difference is linked to synaptonemal complex length, not a suppression mechanism, suggesting similar chiasma interference in both sexes.

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Area of Science:

Genetics
Cell Biology
Reproductive Biology

Background:

Meiotic recombination rates can vary between sexes, often suppressed in the heterogametic sex.
Zebrafish (Danio rerio) show evidence of lower male recombination despite lacking heteromorphic sex chromosomes.

Purpose of the Study:

To investigate the physical basis of meiotic recombination patterns in zebrafish.
To compare recombination frequencies and distributions between male and female zebrafish.

Main Methods:

Antibody staining for human mutL homolog 1 (MLH1) protein to identify chiasmata.
Cytological analysis of MLH1 foci distribution on synaptonemal complexes (SCs).

Main Results:

MLH1 foci were more distally located in male zebrafish SCs compared to a more even distribution in females.

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A ratio of 1:1.55 for MLH1 foci per chromosome was observed between males and females.

The ratio of MLH1 foci per unit SC length was similar between sexes.

Conclusions:

Recombination frequency in zebrafish correlates with SC length, not a sex-specific suppression mechanism.
Chiasma interference appears to function similarly in both male and female zebrafish.
Findings align with observations in humans regarding SC length and recombination rates.