Abstract
In the loach Misgurnus anguillicaudatue, the asexual lineage, which produces unreduced clonal diploid eggs, has been identified. Among 833 specimens collected from 54 localities in Japan and two localities in China, 82 candidates of other lineage(s) of cryptic clones were screened by examining RFLP (restriction fragment length polymorphism)-PCR haplotypes in the control region of mtDNA. This analysis was performed because triploid loaches arise from the accidental incorporation of the sperm nucleus into unreduced diploid eggs of a clone. The categorization of members belonging to three newly identified lineages (clones 2–4) and the previously identified clonal lineage (clone 1) was verified by evaluating the genetic identity between two or more individuals from each clonal lineage based on RAPD (random amplified polymorphic DNA)-PCR and multilocus DNA fingerprints. We detected 75 haplotypes by observing the nucleotide status at variable sites from the control region of mtDNA. Phylogenic trees constructed from such sequences showed two highly diversified clades, A and B, that were beyond the level common for interspecific genetic differentiation. That result suggests that M. anguillicaudatus in Japan is not a single species entity. Two clone-specific mtDNA sequences were included in clade A, and the loaches with such sequences may be the maternal origin of the clones.
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Acknowledgments
This study was partly supported by Grants-in-Aid for the 21st Century COE (Center of Excellence) Program from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan and for the Scientific Research (B) (No.18380108) from the Japanese Society for the Promotion of Science (JSPS) to KA. A part of this study was also supported by the JSPS Ronpaku (Dissertation Ph.D.) Program (CSC-10610) to YL and the JSPS Invitation Fellowship for Research in Japan (S-05135) to AB.
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Morishima, K., Nakamura-Shiokawa, Y., Bando, E. et al. Cryptic clonal lineages and genetic diversity in the loach Misgurnus anguillicaudatus (Teleostei: Cobitidae) inferred from nuclear and mitochondrial DNA analyses. Genetica 132, 159–171 (2008). https://doi.org/10.1007/s10709-007-9158-1
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DOI: https://doi.org/10.1007/s10709-007-9158-1