Association of Copy Number Variation at Intron 3 of HMGA2 With Navel Length in Bos indicus

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Aguiar, Tamiris Sayuri ^{[1, 2]} ; Pintor Torrecilha, Rafaela Beatriz ^{[1, 2]} ; Milanesi, Marco ^{[1, 3, 4, 5]} ; Harth Utsunomiya, Adam Taiti ^{[1, 3]} ; Trigo, Beatriz Batista ^{[1, 3]} ; Tijjani, Abdulfatai ^[6] ; Musa, Hassan Hussein ^[7] ; Lopes, Flavia Lombardi ^[3] ; Ajmone-Marsan, Paolo ^{[4, 5]} ; Carvalheiro, Roberto ^[8] ; de Rezende Neves, Haroldo Henrique ^[9] ; do Carmo, Adriana Santana ^[10] ; Hanotte, Olivier ^{[6, 11]} ; Sonstegard, Tad Stewart ^[12] ; Garcia, Jose Fernando ^{[1, 3, 2]} ; Utsunomiya, Yuri Tani ^{[1, 3]}

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^[1] IAEA, Collaborating Ctr Anim Genom & Bioinformat, Aracatuba - Brazil

^[2] Sao Paulo State Univ, Dept Preventhe Vet Med & Anim Reprod, Sch Agr & Veterinarian Sci, Jaboticabal - Brazil

^[3] Sao Paulo State Univ, Dept Support Prod & Anim Hlth, Sch Vet Med, Aracatuba - Brazil

^[4] Univ Cattolica Sacro Cuore, Dept Anim Sci Food & Nutr, Piacenza - Italy

^[5] Univ Cattolica Sacro Cuore, Ancient DNA Res Ctr BioDNA, Piacenza - Italy

^[6] Univ Nottingham, Cells Organisms & Mol Genet, Sch Life Sci, Nottingham - England

^[7] Univ Khartoum, Fac Med Lab Sci, Khartoum - Sudan

^[8] Sao Paulo State Univ, Sch Agr & Veterinarian Sci, Dept Anim Sci, Jaboticabal - Brazil

^[9] GenSys Consultores Associados, Porto Alegre, RS - Brazil

^[10] Univ Fed Goias, Escola Vet & Zootecnia, Goiania, Go - Brazil

^[11] Int Livestock Res Inst, LiveGene CTLGH, Addis Ababa - Ethiopia

^[12] Recombinetics Inc, St Paul, MN - USA

• Tipo de documento: Artigo Científico
• Fonte: FRONTIERS IN GENETICS; v. 9, DEC 7 2018.
• Citações Web of Science: 1

Resumo

Navel injuries caused by friction against the pasture can promote infection, reproductive problems and costly treatments in beef cattle raised in extensive systems. A haplotype-based genome-wide association study (GWAS) was performed for visual scores of navel length at yearling in Nellore cattle (Bos indicus) using data from 2,016 animals and 503,088 single nucleotide polymorphism (SNP) markers. The strongest signal (p = 1.01 x 10(-9)) was found on chromosome 5 spanning positions 47.9-48.2 Mbp. This region contains introns 3 and 4 and exons 4 and 5 of the high mobility group AT-hook 2 gene (HMGA2). Further inspection of the region with whole genome sequence data of 21 Nellore bulls revealed correlations between counts of the significant haplotype and copy number gains of a similar to 6.2 kbp segment of intron 3 of HMGA2. Analysis of genome sequences from five African B. indicus and four European Bos taurus breeds revealed that the copy number variant (CNV) is indicine-specific. This intronic CNV was then validated through quantitative polymerase chain reaction (qPCR) using Angus animals as copy neutral controls. Importantly, the CNV was not detectable by means of conventional SNP-based GWAS or SNP probe intensity analyses. Given that HMGA2 affects the expression of the insulin-like growth factor 2 gene (IGF2) together with the pleomorphic adenoma gene 1 (PLAG1), and that the latter has been repeatedly shown to be associated with quantitative traits of economic importance in cattle, these findings highlight the emerging role of variants impacting the insulin-like growth factor pathway to cattle breeding. (AU)

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• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
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