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Abstract

As a bHLH transcriptional repressor, Hairy-related proteins can bind to DNA sites in target gene promoters and negatively regulate gene transcription. In the present study, the full-length cDNA of Hairy was obtained from the clam Meretrix meretrix (MmeHairy), and two SNPs in the 3′-untranslated region (UTR) of this gene, SNP1066 and 1067, were identified and characterized. Multiple sequence alignment and phylogenetic analysis revealed that MmeHairy belongs to the Hairy protein subfamily. Analysis of tissue expression patterns showed that the mRNA of MmeHairy had the highest expression level in the hepatopancreas. The expression levels of MmeHairy were up-regulated in the hepatopancreas after Vibrio challenge. Genotyping and quantitative analysis showed that the mRNA levels of MmeHairy were significantly different among individual clams with different genotypes at SNP1066 and 1067 (P < 0.05), which indicated that these two SNP loci may affect the expression of MmeHairy and could be used as candidate markers for future selection in M. meretrix breeding programs.