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Karyotype and X–Y chromosome pairing in the Sikkim vole (Microtus (Neodon) sikimensis)

Published online by Cambridge University Press:  25 June 2002

Kazuyuki Mekada ,
Kazuhiro Koyasu ,
Masashi Harada ,
Yuichi Narita ,
Krishna C. Shrestha  and
Sen-Ichi Oda
Kazuyuki Mekada
Affiliation:
Laboratory of Animal Management and Resources, Graduate School of Bio-Agricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Kazuhiro Koyasu
Affiliation:
The Second Department of Anatomy, School of Dentistry, Aichi-Gakuin University, Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan
Masashi Harada
Affiliation:
Laboratory Animal Center, Osaka City University Medical School, Asahi-machi, Abeno-ku, Osaka 545-8585, Japan
Yuichi Narita
Affiliation:
Center for Human Evolution Modeling Research, Primate Research Institute, Kyoto University, Kanrin, Inuyama 464-8506, Japan
Krishna C. Shrestha
Affiliation:
Department of Zoology, Pri-Chandra Campus, Kathmandu, Nepal
Sen-Ichi Oda
Affiliation:
Laboratory of Animal Management and Resources, Graduate School of Bio-Agricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
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Abstract

Pairing of the X and Y chromosomes during meiotic prophase and the G- and C-banding patterns were analysed in Microtus sikimensis. The karyotype of M. sikimensis from central Nepal, has 2n = 48 and FNa = 56. It has been derived from the all single-armed karyotype of M. carruthersi through a unique course of evolution. There is a synapsis between the X and Y chromosomes at pachytene and end-to-end association from diakinesis to metaphase I. Microtus sikimensis has no close karyological or morphological relationship to the other synaptic species studied so far. These data confirm that several species or lineages with synaptic condition exist in the genus Microtus, and that the ancestor of Microtus had synaptic sex chromosomes.

Keywords

Microtus sikimensiskaryotypesynaptic sex chromosomesMicrotus phylogeny
Type
Research Article
Information
Journal of Zoology , Volume 257 , Issue 3 , July 2002 , pp. 417 - 423
Copyright
2002 The Zoological Society of London

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