open access

https://hdl.handle.net/2115/93211

Nucleotide Sequence and Chromosome mapping of 5S Ribosomal DNA from the Dojo Loach, Misgurnus anguillicaudatus

英語

2024-10-22

Karger

Cytogenetic and genome research

There are 2 genetically divergent groups in the dojo loach Misgurnus anguillicaudatus: A and B. Although most wild-type diploids reproduce sexually, clonal diploids (clonal loach) reproduce gynogenetically in certain areas. Clonal loaches produce unreduced isogenic eggs by premeiotic endomitosis, and such diploid eggs develop gynogenetically following activation by the sperm of sympatric wild-type diploids. These clonal loaches have presumably arisen from past hybridization events between 2 different ancestors. The genomic differences between these 2 groups have not been completely elucidated. Thus, new genetic and cytogenetic markers are required to distinguish between these 2 groups. Here, we compared the 5S rDNA region to develop markers for the identification of different dojo loach groups. The nontranscribed sequence (NTS) of the 5S rDNA was highly polymorphic and group-specific. NTS sequences were found in clades of 2 different groups in clonal loaches. In contrast, we did not find any group-specific sequences in the coding region of the 5S rRNA gene. Sequences were located near the centromere of the short arm of the largest submetacentric chromosomes in groups A and B and clonal loaches. Thus, the 5S rDNA of the dojo loach is conserved at the chromosomal location. Whereas, the sequences of the NTS regions evolved group-specifically in the dojo loach, with the sequences of both groups being conserved in clonal loaches.

学術雑誌論文

Accepted Manuscript

This is the peer-reviewed but unedited manuscript version of the following article: Cytogenet Genome Res 2022;162(10):570–578 (DOI: 10.1159/000529150). The final, published version is available at http://karger.com/?doi=10.1159/000529150

1424-8581