TY  - JOUR
A1  - Schmid, Michael
A1  - Evans, Ben J.
A1  - Bogart, James P.
T1  - Polyploidy in Amphibia
JF  - Cytogenetic and Genome Research
N2  - This review summarizes the current status of the known extant genuine polyploid anuran and urodelan species, as well as spontaneously originated and/or experimentally produced amphibian polyploids. The mechanisms by which polyploids can originate, the meiotic pairing configurations, the diploidization processes operating in polyploid genomes, the phenomenon of hybridogenesis, and the relationship between polyploidization and sex chromosome evolution are discussed. The polyploid systems in some important amphibian taxa are described in more detail.
KW  - allopolyploidy
KW  - Anura
KW  - autopolyploidy
KW  - diploidization
KW  - hybridogenesis
KW  - polyploidization
KW  - sex chromosome evolution
KW  - Urodela
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-196730
SN  - 1424-8581
SN  - 1424-859X
N1  - This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
VL  - 145
IS  - 3-4
ER  - 
TY  - JOUR
A1  - Lamatsch, Dunja K.
A1  - Adolfsson, Sofia
A1  - Senior, Alistair M.
A1  - Christiansen, Guntram
A1  - Pichler, Maria
A1  - Ozaki, Yuichi
A1  - Smeds, Linnea
A1  - Schartl, Manfred
A1  - Nakagawa, Shinichi
T1  - A transcriptome derived female-specific marker from the invasive Western mosquitofish (Gambusia affinis)
JF  - PLoS ONE
N2  - Sex-specific markers are a prerequisite for understanding reproductive biology, genetic factors involved in sex differences, mechanisms of sex determination, and ultimately the evolution of sex chromosomes. The Western mosquitofish, Gambusia affinis, may be considered a model species for sex-chromosome evolution, as it displays female heterogamety (ZW/ZZ), and is also ecologically interesting as a worldwide invasive species. Here, de novo RNA-sequencing on the gonads of sexually mature G. affinis was used to identify contigs that were highly transcribed in females but not in males (i.e., transcripts with ovary-specific expression). Subsequently, 129 primer pairs spanning 79 contigs were tested by PCR to identify sex-specific transcripts. Of those primer pairs, one female-specific DNA marker was identified, Sanger sequenced and subsequently validated in 115 fish. Sequence analyses revealed a high similarity between the identified sex-specific marker and the 3' UTR of the aminomethyl transferase (amt) gene of the closely related platyfish (Xiphophorus maculatus). This is the first time that RNA-seq has been used to successfully characterize a sex-specific marker in a fish species in the absence of a genome map. Additionally, the identified sex-specific marker represents one of only a handful of such markers in fishes.
KW  - sex chromosome evolution
KW  - linkage map
KW  - determination locus
KW  - poeciliid fishes
KW  - heterogamety
KW  - Cynoglossus semilaevis
KW  - determining genes
KW  - Y chromosome
KW  - sequence alignment
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-144004
VL  - 10
IS  - 2
ER  -