Abstract
In this study, we aimed to assess the sequence diversity of major histocompatibility complex (MHC) class-II DRB gene at exon 2 in gazelles raised in Sanliurfa Province of Turkey. Twenty DNA samples isolated from gazelles (Gazella subgutturosa) were used for sequencing exon 2 of MHC class-II DRB gene. Target region was amplified by polymerase chain reaction (PCR) and their products were directly sequenced. Nine of these 20 samples yielded unambiguously readable sequences. Three of the nine samples were homozygotes and each showed different sequences. A 262-bp sequence obtained from the three homozygote samples were submitted to GenBank (accession numbers: KC309405, KC309406 and KC309407). Using an allele specific PCR, we detected 10 additional haplotypes. Among 13 haplotypes, 45 nucleotide positions were polymorphic and most of the polymorphic nucleotide positions localized at peptide-binding region (PBR). Rates of nonsynonymous substitutions were significantly higher than synonymous substitutions at PBR. Phylogenetic analysis of the haplotypes showed that 10 haplotypes of the gazelles were clustered together while three were clustered with ovine and bovine haplotypes. The results indicated that at least 13 haplotypes at exon 2 of MHC class-II DRB gene were showing high degree of nucleotide and amino acid diversity, and certain haplotypes of G. subgutturosa were more similar to haplotypes from sheep or cattle than to each other. Rates of synonymous and nonsynonymous substitutions suggested that positive selection was a driving force for diversity at this locus in G. subgutturosa.
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This study was approved by Turkish General Directorate of Nature Protection and National Parks (approval number: 30057506-430.99-194703). We thank Turkish General Directorate of Nature Protection and National Parks for their technical support.
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Bozkaya, F., Gürler, Ş. Sequence diversity of MHC class-II DRB gene in gazelles (Gazella subgutturosa) raised in Sanliurfa of Turkey. J Genet 97, 897–903 (2018). https://doi.org/10.1007/s12041-018-0974-0
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DOI: https://doi.org/10.1007/s12041-018-0974-0