Abstract
Genome-Wide Association Studies (GWAS) are used for identification of quantitate trait loci (QTL) and genes associated with several traits. We aimed to identify genomic regions, genes, and biological processes associated with number of total and viable oocytes, and number of embryos in Gir dairy cattle. A dataset with 17,526 follicular aspirations, including the following traits: number of viable oocytes (VO), number of total oocytes (TO), and number of embryos (EMBR) from 1641 Gir donors was provided by five different stock farms. A genotype file with 2093 animals and 395,524 SNP markers was used to perform a single-step GWAS analysis for each trait. The top 10 windows with the highest percentage of additive genetic variance explained by 100 adjacent SNPs were selected. The genomic regions identified in our work were overlapped with QTLs from QTL database on chromosomes 1, 2, 5, 6, 7, 8, 9, 13, 17, 18, 20, 21, 22, 24, and 29. These QTLs were classified as External, Health, Meat and carcass, Production or Reproduction traits, and about 38% were related to Reproduction. In total, 117 genes were identified, of which 111 were protein-coding genes. Exclusively associations were observed for 42 genes with EMBR, and 1 with TO. Also, 42 genes were in common between VO and TO, 28 between VO and EMBR, and four genes were in common among all traits. In conclusion, great part of the identified genes plays a functional role in initial embryo development or general cell functions. The protein-coding genes ARNT, EGR1, HIF1A, AHR, and PAX2 are good markers for the production of oocytes and embryos in Gir cattle.
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Data availability
The datasets generated and analyzed during this study are available from the corresponding author on reasonable request.
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We thank the farmers who provided data for this study.
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Coordination and Improvement of Higher Level Personnel (CAPES), National Council for Scientific and Technological Development (CNPq)—regarding process 142600/2019-9, Ministério da Ciência Tecnologia e Inovação (MCTI) and Brazilian National Institute of Science and Technology in Animal Science (INCT-CA) provided financial support towards this study.
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JCdCP, MAM, MVBdS, SEFG: conceptualization of the study. RFBR, SEFG: drafted the manuscript. RFBR: performed the experiments and analysis. AOG, MGS, PIO: statistical analyses support. MVBdS, MFM, MAM, JCdCP: bioinformatics technical support. All authors read and approved the final manuscript.
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Rocha, R.d.B., Garcia, A.O., Otto, P.I. et al. Single-step genome-wide association studies and post-GWAS analyses for the number of oocytes and embryos in Gir cattle. Mamm Genome 34, 497–508 (2023). https://doi.org/10.1007/s00335-023-10009-0
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DOI: https://doi.org/10.1007/s00335-023-10009-0