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bioRxiv preprint doi: https://doi.org/10.1101/2020.04.11.036939; this version posted April 13, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 Metabolite genome-wide association study (mGWAS) and gene-metabolite 2 interaction network analysis reveal potential biomarkers for feed efficiency 3 in pigs 4 5 Xiao Wang and Haja N. Kadarmideen* 6 7 Quantitative Genomics, Bioinformatics and Computational Biology Group, Department of Applied 8 Mathematics and Computer Science, Technical University of Denmark, Richard Petersens Plads, 9 Building 324, 2800 Kongens Lyngby, Denmark 10 11 12 *Corresponding author: [email protected] 13 14 15 16 17 18 19 20 21 22 23 24 25 26 1 bioRxiv preprint doi: https://doi.org/10.1101/2020.04.11.036939; this version posted April 13, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 27 Abstract 28 Metabolites represent the ultimate response of biological systems, so metabolomics is considered to 29 link the genotypes and phenotypes. Feed efficiency is one of the most important phenotypes in 30 sustainable pig production and is the main breeding goal trait. We utilized metabolic and genomic 31 datasets from a total of 108 pigs from our own previously published studies that involved 59 Duroc 32 and 49 Landrace pigs with data on feed efficiency (residual feed intake or RFI), genotype 33 (PorcineSNP80 BeadChip) data and metabolomic data (45 final metabolite datasets derived from LC- 34 MS system). Utilizing these datasets, our main aim was to identify genetic variants (single-nucleotide 35 polymorphisms or SNPs) that affect 45 different metabolite concentrations in plasma collected at the 36 start and end of the performance testing of pigs categorized as high or low in their feed efficiency 37 (based on RFI values). Genome-wide significant genetic variants could be then used as potential 38 genetic or biomarkers in breeding programs for feed efficiency. The other objective was to reveal the 39 biochemical mechanisms underlying genetic variations for pigs’ feed efficiency. In order to achieve 40 these objectives, we firstly conducted a metabolite genome-wide association study (mGWAS) based 41 on mixed linear models and found 152 genome-wide significant SNPs (P-value < 1.06E-06) in 42 association with 17 metabolites that included 90 significant SNPs annotated to 52 genes. On 43 chromosome one alone, 51 significant SNPs associated with isovalerylcarnitine and 44 propionylcarnitine were found to be in strong linkage disequilibrium (LD). SNPs in strong LD 45 annotated to FBXL4 and CCNC consisted of two haplotype blocks where three SNPs 46 (ALGA0004000, ALGA0004041 and ALGA0004042) were in the intron regions of FBXL4 and 47 CCNC. The interaction network revealed that CCNC and FBXL4 were linked by the hub gene 48 N6AMT1 that was associated with isovalerylcarnitine and propionylcarnitine. Moreover, three 49 metabolites (i.e., isovalerylcarnitine, propionylcarnitine and pyruvic acid) were clustered in one group 50 based on the low-high RFI pigs. 51 This study performed a comprehensive metabolite-based GWAS analysis for pigs with differences in 52 feed efficiency and provided significant metabolites for which there is a significant genetic variation 53 as well as biological interaction networks. The identified metabolite genetic variants, genes and 54 networks in high versus low feed efficient pigs could be considered as potential genetic or biomarkers 55 for feed efficiency. 56 57 58 59 60 2 bioRxiv preprint doi: https://doi.org/10.1101/2020.04.11.036939; this version posted April 13, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 61 1. Introduction 62 Large populations are generally essential for genome-wide association study (GWAS) to obtain 63 sufficient statistical power for the identification of genetic polymorphisms [1]. However, some 64 intermediate phenotypes like metabolites could potentially avoid this problem, as they are directly 65 involved in metabolite conversion modification [2,3]. As the end products of cellular regulatory 66 processes, metabolites represent the ultimate response of biological systems associated with genetic 67 changes, so metabolomics is considered to link the genotypes and phenotypes [4]. Metabolomics 68 refers to the measurements of all endogenous metabolites, intermediates and products of metabolism 69 and has been applied to measure the dynamic metabolic responses in pigs [5,6] and dairy cows [7,8]. 70 Additionally, metabolites could provide details of physiological state, so genetic variants associated 71 metabolites are expected to display larger effect sizes [9]. Gieger et al. (2008) firstly used metabolite 72 concentrations as quantitative traits in association with genotypes and found their available 73 applications in GWAS [9]. Do et al. [10] conducted GWAS using residual feed intake (RFI) 74 phenotypes to identify single-nucleotide polymorphisms (SNPs) that explain significant variations in 75 feed efficiency for pigs. Our previous study found two metabolites (i.e., α-ketoglutarate and succinic 76 acid) in a RFI-related network of dairy cows, which could represent biochemical mechanisms 77 underlying variation for phenotypes of feed efficiency [8]. 78 In this study, we aimed to identify genetic variants (SNP markers) affecting concentrations of 79 metabolites and to reveal the biochemical mechanisms underlying genetic variations for pigs’ feed 80 efficiency. Our study is based on two of our previously published papers and datasets used therein 81 [6,11]. Briefly, the experiment consisted of 59 Duroc and 49 Landrace pigs with data on feed 82 efficiency (RFI), genotype (PorcineSNP80 BeadChip) data and metabolomic data (45 final metabolite 83 datasets derived from liquid chromatography-mass spectrometry (LC-MS) system). While our 84 previous studies only looked at metabolome-phenotype associations, we report an integrated systems 85 genomics approach to identify quantitative trait loci (QTLs) or SNPs affecting metabolite 86 concentration via metabolite GWAS methods (mGWAS), where each metabolite is itself a phenotype. 87 To the best of our knowledge, this is the first study to link the genomics with metabolomics to identify 88 significant genetic variants associated with known metabolites that differ in pigs with different levels 89 of feed efficiency. Main aims of our study are as follows: 90 1. Find significant SNP markers associated with all the metabolites in the metabolomics dataset 91 using mGWAS method, and then to reveal the biochemical mechanisms underlying genetic 92 variations for porcine feed efficiency using 108 Danish pigs in low and high RFI conditions, 93 genotyped by 68K PorcineSNP80 BeadChip array. 94 2. Annotate identified significant SNP markers to porcine genes. 3 bioRxiv preprint doi: https://doi.org/10.1101/2020.04.11.036939; this version posted April 13, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 95 3. Annotate metabolites and identify enriched metabolic pathways and gene-metabolite 96 networks to find the potential biomarkers that were strongly associated with feed efficiency. 97 98 2. Results 99 2.1. First component score and significant metabolic pathways of 45 metabolites 100 The partial least squares-discriminant analysis (PLS-DA) results revealed that the first component 101 score (Component 1) explained more than 75% variations of all 45 metabolites. In addition, the Duroc 102 and Landrace pigs were clearly stratified, especially using the metabolite values between Duroc from 103 first sampling time and Landrace from second sampling time (Figure 1A). The most significant 104 metabolic pathways were the aminoacyl-tRNA biosynthesis, following by the arginine biosynthesis, 105 the arginine and proline metabolism, the alanine, aspartate and glutamate metabolism (Figure 1B). As 106 the pathway impact of the aminoacyl-tRNA biosynthesis was zero, we discarded this significant 107 pathway and only used the metabolites enriched in the other three significant pathways for GWAS 108 (Table 1). Thus, the metabolite means for 5 compounds in the arginine biosynthesis (arginine, aspartic 109 acid, citrulline, glutamic acid, ornithine), 5 compounds in the arginine and proline metabolism 110 (arginine, glutamic acid, ornithine, proline, pyruvic acid) and 4 compounds in the alanine, aspartate 111 and glutamate metabolism (alanine, aspartic acid, glutamic acid, pyruvic acid) metabolites were 112 calculated and shown in Table 1. 113 114 115 Figure 1. (A) Partial least squares-discriminant analysis (PLS-DA) of 45 metabolites. Note: D/L with 116 First/Second indicates the sampling time of Duroc/Landrace pigs. (B) Metabolic pathways for 45 4 bioRxiv preprint doi: https://doi.org/10.1101/2020.04.11.036939; this version posted April 13, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 117 metabolites using Homo sapiens as the library. Note: The size and color of the circles for each 118 pathway indicate the matched metabolite ratio and the -log (P-value), respectively. 119 120 Table
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