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Male-specific restriction of recombination frequency in the sex chromosomes of the medaka, Oryzias latipes

Published online by Cambridge University Press:  01 June 1999

MASARU MATSUDA ,
SAEMI SOTOYAMA ,
SATOSHI HAMAGUCHI  and
MITSURU SAKAIZUMI
MASARU MATSUDA
Affiliation:
Graduate School of Science and Technology, Niigata University, Ikarashi, Niigata 950-2181, Japan Present address: Laboratory of Reproductive Biology, National Institute for Basic Biology, Okazaki 444-8585, Japan. Tel: +81 564 55 7553. Fax: +81 564 55 7556. e-mail: matsuda@nibb.ac.jp.
SAEMI SOTOYAMA
Affiliation:
Graduate School of Science and Technology, Niigata University, Ikarashi, Niigata 950-2181, Japan
SATOSHI HAMAGUCHI
Affiliation:
Department of Environmental Science, Faculty of Science, Niigata University, Ikarashi, Niigata 950-2181, Japan
MITSURU SAKAIZUMI
Affiliation:
Department of Environmental Science, Faculty of Science, Niigata University, Ikarashi, Niigata 950-2181, Japan
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Abstract

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In the medaka, Oryzias latipes, the mechanism of sex determination (XX/XY) can be revealed by genetic crosses using a body-colour gene, though it does not have cytologically recognizable sex chromosomes. The recombination restriction of sex chromosomes in heterogametic (XY) males has been demonstrated. To elucidate whether the recombination is prevented by the heterogamety of the sex chromosomes or by maleness, we examined the recombination frequencies among three loci located on the sex chromosomes (r, SL1 and SL2) in heterogametic males (XY), homogametic males (XX and YY), homogametic females (XX) and heterogametic females (XY). The recombination frequencies between r–SL1 and SL1–SL2 were as follows: 0, 0 (XY males); 0, 1·5 (XX males); 1·6% (YY males; 1·2%, 14·4% (XY females); 0·8%, 21·8% (XX females). These results indicate that the recombination restriction of the sex chromosomes in heterogametic males does not result from heterogametic sex chromosomes, but from maleness. Such sex-chromosome- specific recombination restriction in heterogametic sex may have triggered the differentiation of sex chromosomes in vertebrates.

Type
Research Article
Information
Genetics Research , Volume 73 , Issue 3 , June 1999 , pp. 225 - 231
Copyright
© 1999 Cambridge University Press