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Original Article

An examination of intergenomic exchanges in A. laterale-dependent unisexual salamanders in the genus Ambystoma

Bi K. · Bogart J.P. · Fu J.

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Department of Integrative Biology, University of Guelph, Guelph, Ont. (Canada)

Related Articles for ""

Cytogenet Genome Res 2009;124:44–50

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Article / Publication Details

First-Page Preview
Abstract of Original Article

Accepted: September 26, 2008
Published online: April 15, 2009
Issue release date: April 2009

Number of Print Pages: 7
Number of Figures: 3
Number of Tables: 2

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR

Abstract

The evolutionary longevity of unisexual salamanders in the genus Ambystoma may be attributed to their flexible reproductive system and meiotic intergenomic interactions. More than 20 different unisexual genomic combinations have been found and all the unisexuals live with at least one of the sexual species A. laterale, A. jeffersonianum, A. texanum, and A. tigrinum. Most unisexuals rely on A. laterale orA. jeffersonianum as sperm donors. Intergenomic exchanges were previously reported in A. jeffersonianum-dependent unisexual populations from southern Ontario and are believed to be an important meiotic mechanism that provides genetic diversity. The situations of intergenomic exchanges in many of A. laterale-dependent unisexual populations, however, remain unknown. In this study we collected specimens from populations where unisexuals use A. laterale as sperm donors, including mainly triploid A. 2 lateralejeffersonianum (or LLJ), and employed genomic in situ hybridization (GISH) to examine the intergenomic exchanges. Five patterns of intergenomic exchanges were detected. Intergenomic exchanges are less frequent and lack association among populations in A. laterale-dependent than in A. jeffersonianum- dependent unisexual populations, but more recombined homeologues were observed in LLJ unisexuals. Our observations show that the patterns and frequencies of intergenomic exchanges are different when unisexuals use different sexual species as sperm donors. We propose a few possible mechanisms that may account for these different observations.

© 2009 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Original Article

Accepted: September 26, 2008
Published online: April 15, 2009
Issue release date: April 2009

Number of Print Pages: 7
Number of Figures: 3
Number of Tables: 2

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR


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