Two rare aneutriploids in the unisexual Ambystoma (Amphibia, Caudata) identified by GISH indicating two different types of meiotic errors

被引：9

作者：

Bi, K. ^{[1
]}

Bogart, J. P. ^{[1
]}

Fu, J. ^{[1
]}

机构：

[1] Univ Guelph, Dept Integrat Biol, Guelph, ON N1G 2W1, Canada

来源：

CYTOGENETIC AND GENOME RESEARCH | 2007年 / 119卷 / 1-2期

关键词：

D O I：

10.1159/000109628

中图分类号：

Q2 [细胞生物学];

学科分类号：

071009 ; 090102 ;

摘要：

We report two types of aneutriploids in unisexual salamanders Ambystoma laterale-2jeffersonianum (LJJ) and Ambystoma 2 laterale-jeffersonianum (LLJ). One karyotype has 3n = 42: L27 (L8-); J15 (J8p+), and we suggest that it was induced by homoeologous pairing after premeiotic endomitosis followed by an unequal L8;J8 segregation. The second karyotype has 3n = 43: L14 (L10q); J29 (J12+), which can be explained by meiotic nondisjunction followed by unbalanced segregation. These two rare aneutriploids demonstrate two different types of meiotic errors that might help to explain the high mortality observed in this complex. Case one also indicates that contemporary intergenomic exchanges and homoeologous recombinations may occur after a premeiotic chromosome doubling event. Our study provides additional evidence for the extremely flexible reproduction of unisexual Ambystoma. Copyright (C) 2007 S. Karger AG, Basel.

引用

页码：127 / 130

页数：4

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