Ijiri M, Lai YC, Kawaguchi H, Fujimoto Y, Miura N, Matsuo T, Tanimoto A.
NR6A1 Allelic Frequencies as an Index for both Miniaturizing and Increasing Pig Body Size.
In Vivo 2021;
35:163-167. [PMID:
33402462 PMCID:
PMC7880744 DOI:
10.21873/invivo.12244]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 11/03/2020] [Accepted: 11/06/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM
The number of vertebrae in swine varies from 19 to 23 and is associated with body size. Nuclear receptor subfamily 6 group A member 1 (NR6A1) is considered a strong candidate for affecting the number of vertebrae in swine. Wild boars, which uniformly have 19 vertebrae, have the wild type allele while multi-vertebrae European commercial pigs have the mutated allele. Our aim was to confirm the factor of the miniaturization.
MATERIALS AND METHODS
We examined vertebrae number and NR6A1 polymorphism in the Microminipig and three domestic breeds that vary in body size.
RESULTS
The Microminipig had 19 or less vertebrae and a wild type NR6A1 genotype. Three domestic breeds had more than 21 vertebrae while the largest vertebrae number was observed in multi-vertebrae-fixed Large White. Heterozygous genotypes were observed in the middle-sized indigenous pig while homozygous NR6A1 mutations were observed in European commercial breeds.
CONCLUSION
NR6A1 could be a useful index for both miniaturizing and increasing pig body size.
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