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A novel mitochondrial intergenic spacer reflecting population structure of Pacific oyster

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Abstract

Nucleotide sequence divergence in a novel major mitochondrial DNA intergenic spacer (IGS) of Pacific oysterCrassostrea gigas was analyzed for 29 cultured individuals within the Goseong population (Korea). A total of 7 variable sites were detected within the IGS, and the relative frequency of nucleotide alteration was determined to be 1.16%. All alterations were due to a single nucleotide substitution, and 5 transitions and 2 transversions were observed. Among 29 specimens, only 8 haplotypes could be identified, and 6 of the haplotypes were unique to particular specimens. Pairwise genetic diversity of all 8 haplotypes was calculated to be 0.412 ± 0.134 from multiple sequence substitutions based on the two-parameter model. The phylogenetic tree obtained for these haplotypes according to the neighbor-joining method illustrated a single cluster of linkages, which comprised 5 haplotypes associated with 23 specimens, while the other 3 haplotypes associated with 6 specimens were scattered. The results indicate that the IGS is higher polymorphic and thus more suitable as a genetic marker for population structure analysis of Pacific oyster than the mtDNA coding regions, such as cytochromec oxidase I and 16S ribosomal RNA genes.

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  1. Department of Biological and Environmental Sciences, Miyazaki University, 889-2192, Miyazaki, Japan

    Futoshi Aranishi

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  1. Futoshi Aranishi
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Correspondence to Futoshi Aranishi.

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Aranishi, F. A novel mitochondrial intergenic spacer reflecting population structure of Pacific oyster. J Appl Genet 47, 119–123 (2006). https://doi.org/10.1007/BF03194610

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  • DOI: https://doi.org/10.1007/BF03194610

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