Abstract
An excellent candidate for the master sex-determining gene on the Y chromosome of the medaka fish is not related to the mammalian SRY gene
Highlights
In contrast to mammals and birds, teleost fish display an amazing diversity of sex-determination systems
In contrast to the situation observed in humans, the medaka Y chromosome is very similar to the X; there is no cytogenetic difference between X and Y, and X-Y pairing occurs along almost the complete chromosome length. This suggests that the male-determining region on the Y chromosome should be relatively small
Deletion analysis of the Y chromosome of an XY congenic female further shortened the region to 250 kb, containing 27 candidate genes
Summary
In contrast to mammals and birds, teleost fish display an amazing diversity of sex-determination systems. Sex determination in the teleost fish O. latipes (medaka) involves simple male heterogamety. This suggests that the male-determining region on the Y chromosome should be relatively small.
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