Journal of Zhejiang Agricultural Sciences ›› 2026, Vol. 67 ›› Issue (2): 470-476.DOI: 10.16178/j.issn.0528-9017.20240954

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Analysis and development application of SSR locus based on transcriptome sequencing of Mytilus coruscus

SHAO Yanqing1,2(), FANG Jun1,2, LIU Yijiang3, JIN Hanyu1,2,3, LI Tengteng1,2   

  1. 1.Zhejiang Key Laboratory of Coastal Biological Germplasm Resources Conservation and Utilization,Zhejiang Mariculture Research Institute,Wenzhou 325005,Zhejiang
    2.Engineering Research Center for Marine Bivalves,Chinese Academy of Fishery Sciences,Wenzhou 325005,Zhejiang
    3.Wenzhou Vocational College of Science & Technology,Wenzhou 325006,Zhejiang
  • Received:2024-12-13 Online:2026-02-28 Published:2026-03-07

Abstract:

To further develop EST-SSR molecular markers suitable for Mytilus coruscus,a large number of SSR loci were obtained using transcriptome sequence information,and the loci information and population genetic diversity were analyzed. The results showed that a total of 134 331 UniGene sequences were obtained by transcriptome sequencing,with a total of 15 988 SSR loci detected,occurring at a frequency of 11.900%,averaging one SSR locus per 4.16 kb. There were a total of 172 types of repeat motifs in intact SSR loci,among which mononucleotide and dinucleotide repeats were the main types,accounting for 83.00% and 11.22% of the total SSR loci,respectively. The A/T motif(80.91%)and AT/AT motif(7.70%)were the main types. A total of 31 125 pairs of SSR primers were designed,and 11 out of 60 randomly selected primers showed polymorphism,accounting for 18.33%. The genetic diversity of the Mytilus coruscus population was analyzed using polymorphic primers,and a total of 39 alleles were detected. The number of alleles(Na)at each locus was 3-5,and the average observed heterozygosity(Ho),average expected heterozygosity(He),and average polymorphic information content(PIC)were 0.33,0.56,and 0.48,respectively. Among them,8 loci deviated significantly(p<0.01)from Hardy-Weinberg equilibrium. The development of these EST-SSR molecular markers can provide effective support for population genetics,genetic relation,gene linkage analysis,genetic diversity assessment of Mytilus coruscus.

Key words: Mytilus coruscus, simple sequence repeat(SSR), transcriptome

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