Genome-Wide Association Study Identifies Genomic Loci Associated With Neurotransmitter Concentration in Cattle

Qiuming Chen; Kaixing Qu; Zhijie Ma; Jingxi Zhan; Fengwei Zhang; Jiafei Shen; Qingqing Ning; Peng Jia; Jicai Zhang; Ningbo Chen; Hong Chen; Bizhi Huang; Chuzhao Lei

doi:10.3389/fgene.2020.00139

Genome-Wide Association Study Identifies Genomic Loci Associated With Neurotransmitter Concentration in Cattle

Front Genet. 2020 Mar 27:11:139. doi: 10.3389/fgene.2020.00139. eCollection 2020.

Authors

Affiliations

¹ Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China.
² Yunnan Academy of Grassland and Animal Science, Kunming, China.
³ Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining, China.

Abstract

Abnormal neurotransmitter concentration is one of the factors that affect the health status, behavioral personality, and welfare level of animals, but the genetic basis of the abnormality is still largely unknown. The objective of this study is to identify putative genomic loci associated with neurotransmitter concentration in cattle. We measured serotonin (5HT), dopamine (DA), cortisol, glutamate (Glu), and ACTH concentrations in blood serum using double-antibody sandwich ELISA in 30 Brahman cattle and 127 Yunling cattle. Interestingly, we found that ACTH concentration was positively correlated with body weight, cannon circumference, and hip width (P < 0.05). Genome-wide association study (GWAS) was performed with mixed linear models using autosomal SNPs derived from the whole-genome sequence. We identified five, five, two, three, and five suggestive loci associated with 5HT, DA, cortisol, Glu, and ACTH concentration, respectively. These 20 associated loci implicated 18 candidate genes. For Glu concentration, the most significant association locus was assigned to MCHR1, a G-coupled receptor that could modulate glutamate release. For dopamine concentration, a very strong association locus was located in the intron of SLC18A2, which is a critical mediator of dopamine dynamics. However, for ACTH concentration, a very strong association locus was assigned to HTR1F, a G protein-coupled receptor that can influence the release of ACTH. Other candidate genes of interest identified for neurotransmitter concentration were PRMT6, GADD45A, PCCA, ANGPT1, ACCS, LOC100336971, TNR, GSDMA, CNTN3, CARMIL1, CDKAL1, RBFOX1, PCDH15, and LGALS12. Our findings will provide targets for the genetic improvement of neurotransmitter-related traits in domestic cattle and basic materials for studying the mechanism of neurotransmitter synthesis, release, and transport in human and animals.

Keywords: Bos indicus; Bos taurus; candidate genes; genome-wide association study; neurotransmitter concentration.