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Single-nucleotide polymorphism markers in mitochondrial genomes for identifying Varroa destructor-resistant and -susceptible strains of Apis mellifera (Hymenoptera: Apidae).

Mitogenome sequences have a high potential for possessing single-nucleotide polymorphisms (SNPs) that can be used to identify different strains of an organism bred based on maternal lines. The European honey bee, Apis mellifera ligustica (Hymenoptera: Apidae), with a high-hygienic behaviour (HHB) against the external parasitic mite Varroa destructor has been bred for several years in Korea. To distinguish this strain from low-hygienic behaviour (LHB) strains, the complete mitogenome of the two strains were sequenced using next-generation sequencing techniques to detect SNPs. The two mitogenomes with lengths of 16,449 and 16,426 base pairs (bp) in the HHB and LHB strains, respectively, contained a typical set of genes (13 protein-coding genes, 2 rRNA genes, and 22 tRNA genes, plus one non-coding region), exhibited similar-nucleotide compositions, and had an identical gene arrangement compared to other available A. mellifera mitogenomes. The major differences between the HHB and LHB strains included the length of the intergenic spacer sequences located at the COIII and trnG junction (88 vs. 70 bp) and ND4 and ND4L junction (45 vs. 33 bp) and the presence or absence of a duplicated sequence block (CTTTTTTAAAAAAATAAAAA) in the A + T-rich region. Comparison of the mitogenome sequences from the two strains of A. m. ligustica revealed 23 SNPs in 11 protein-coding genes which were confirmed by sequencing of 10 randomly selected individuals from each strain, indicating the usefulness of these SNP markers for identifying the HHB strain of A. m. ligustica. Therefore, mitogenome sequences are a promising genome source for detecting SNP markers, particularly those in inbred female lines.

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