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Expression Profiling and Identification of Novel SNPs in CatSper2 Gene and Their Influence on Sperm Motility Parameters in Bovines.
Animal Biotechnology 2018 January 3
122 randomly selected Vrindavani cattle were studied to detect polymorphism in four fragments of the CatSper2 gene that were comprised of exon 2, 4, 5, and 6 with flanking regions. Using PCR-SSCP and sequencing analysis, three SNPs (T157C, C273A, and A274C) in the first fragment, one SNP (C30G) in the second fragment, and two SNPs (T86G and T292C) in the fourth fragment were identified. The third fragment did not reveal any polymorphism. The SNPs were used for construction of haplotypes and three haplotypes were found. The least square analysis of variance revealed a significant (P < 0.01) effect of haplotype on all three motility parameters. The haplotype II and III were nonsignificantly different from each other while being significantly (P < 0.01) different from haplotype I. The nonsignificant difference of haplotype II with III can lead to a hypothesis that T>G or C>T SNPs may not play a role in sperm motility. However, when the comparison was made between haplotype I and II, it can be inferred that C>T SNP may have a role in sperm motility, as haplotype II has better motility parameters. Expression profiling of Catper2 gene revealed nonsignificant down regulation of CatSper2 gene in poor motility sperm compared to good motility sperm.
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