苏淮猪抗腹泻MUC13基因rs319699771位点多态性及其与经济性状的关联
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摘要
【背景】MUC13基因是调控致使仔猪断奶前腹泻的产肠毒素大肠杆菌F4ac感染的主效基因,该基因上rs319699771位点(G/A突变)能准确鉴别易感和抗性个体,其中GG型是抗腹泻基因型,苏淮猪抗腹泻性能分子选育是通过选留GG型个体来实现。但在选留抗腹泻GG型个体时是否会对苏淮猪其它重要经济性状如生长、胴体、肉质产生不利影响尚未明晰。【目的】旨在分析该位点是否与其它性状关联,以确定基于MUC13基因rs319699771位点抗腹泻性能的分子选育是否会对苏淮猪其它经济性状产生不利影响。【方法】以313头体重为87.61±0.54 kg的苏淮育肥猪为试验动物,屠宰测定其胴体和肉质性状,以261头日龄为161.1±0.5 d苏淮后备猪为试验动物,测定其生长、体尺性状,同时采集相应苏淮育肥猪和后备猪群耳组织样提取组织DNA,经过多重PCR反应进行MUC13基因rs319699771位点多态性检测,采用SAS软件中一般线性模型分析MUC13基因rs319699771位点多态性基因型和苏淮猪肉质、胴体和生长性状的关联性。【结果】MUC13基因rs319699771位点多态性检测结果显示,苏淮猪育肥群公、母猪群体MUC13基因rs319699771位点的抗腹泻G等位基因频率分别为0.695和0.634,抗腹泻优势GG型频率在苏淮猪育肥群公、母群体中分别为0.467和0.373;该位点抗腹泻G等位基因频率在苏淮后备群公、母猪群体分别为0.690和0.705,抗腹泻优势GG型频率在后备群公、母猪群体中分别为0.508和0.480,说明苏淮猪抗腹泻等位基因频率较高,通过分子选育提升苏淮猪抗腹泻GG型频率的可行性强。MUC13基因rs319699771位点多态性与苏淮猪经济性状关联分析结果显示:育肥猪群体该位点多态性与胴体、肉质性状均无显著关联(P>0.05),可见在苏淮猪育肥猪群体内加大对抗腹泻MUC13基因rs319699771位点的选育不会影响到苏淮育肥猪的胴体和肉质性状;苏淮后备猪群体该位点多态性与腿臀围指标存在极显著关联(P<0.01),该位点GG型个体腿臀围平均比比AG型个体腿臀围长1.46 cm,比AA型个体腿臀围长3 cm;与日增重和结测体重的关联性分析有关联趋势(P<0.10),GG型个体相较于AA、AG型个体有提升趋势,对于这三个性状来说,有利基因型都是GG型,说明选留该位点GG型进行苏淮后备猪抗腹泻选育的同时还可以提升苏淮后备猪生长相关性状。【结论】据此,苏淮猪群体MUC13基因rs319699771位点抗腹泻等位基因频率较高,进行抗腹泻选育的可行性强,同时对于苏淮猪群体,不仅可通过选留提升MUC13基因rs319699771位点GG型频率来提高抗腹泻能力,还能同时实现对苏淮猪群腿臀围、日增重的选育提升。
【Background】 MUC13 gene is one of the main genes, which can regulate the infection of enterotoxigenic Escherichia coli F4 ac, and cause diarrhea in piglets before weaning. The rs319699771 locus of the gene(G/A mutation) can accurately identify susceptible and resistant individuals, among which GG type is an anti-diarrhea genotype. The anti-diarrhea molecular breeding of Suhuai pig has been implemented by selecting GG genotype individuals, but whether the selection of GG genotype individuals will have adverse effects on other important economic traits, such as growth, carcass and meat quality, which is not yet clear. 【Objective】 The purpose of this study was to analyze the association between the locus and other economic traits to determine whether the molecular selection based on the rs319699771 locus of anti-diarrhea MUC13 gene would have adverse effects on other economic traits of Suhuai pig. 【Method】 In this experiment, 313 Suhuai fattening pigs weighting 87.61±0.54 kg were tested as experimental animals, and their carcass and meat quality traits were determined through slaughter. 261 Suhuai gilt pigs aging for 161.1±0.5 d were tested as experimental animals, and their growth and body size phenotype were also determined. At the same time, the corresponding ear tissue samples of Suhuai fattening pigs and gilt pigs were collected to extract tissue DNA. After Multiplex-PCR reactions, the polymorphism of the rs319699771 locus of MUC13 gene was detected in each pig. The association analysis between the polymorphism genotype of the rs319699771 locus of MUC13 gene and meat quality, carcass and growth traits were conducted by using the general linear model in SAS software. 【Result】 The results of polymorphism of rs319699771 locus of MUC13 gene showed that among the frequency of anti-diarrhea G allele of rs319699771 locus of MUC13 gene, the male and female pigs of the fattening pigs reached 0.695 and 0.634, respectively, and the anti-diarrhea GG genotype frequency was 0.467 and 0.373,respectively, in the male and female fattening pigs. While the locus G allele among the male and female pigs of the gilt reached 0.690 and 0.705, respectively, and the anti-diarrhea GG genotype frequency was 0.508 and 0.480, respectively, in the male and female gilt pigs. This indicated that the frequency of anti-diarrhea gene in Suhuai pig belonged to a higher level, and it could be feasible for the further improvement of anti-diarrhea GG frequency in the Suhuai pig through molecular breeding. The association analysis between polymorphism of rs319699771 locus of MUC13 gene and economic traits of Suhuai pig showed that there was no significant association between the locus' s polymorphism and carcass, meat quality traits in the fattening pigs(P>0.05), and it could be seen that increasing the breeding of the rs319699771 locus of MUC13 gene in Suhuai fattening pigs would not affect the carcass and meat quality traits. The locus' s polymorphism in the gilt extremely associated with the ham circumference index(P<0.01), and on average,the ham circumference of GG type individuals at this locus was about 1.46 cm longer than that of AG type individuals, and about 3 cm longer than that of AA type individuals. Also, the locus tended to associate with daily gain and terminal measurement weight(P<0.10), GG type individuals showed an upward trend compared with AA and AG type individuals. All of the three traits, GG genotype was a favorable genotype. The results showed that the breeding of the anti-diarrhea GG genotype of this locus could improve the growth traits of Suhuai gilt pigs. 【Conclusion】 Based on these results, the anti-diarrhea allele frequency of the rs319699771 locus of MUC13 gene in Suhuai pig was high, and the anti-diarrhea breeding was feasible, and the anti-diarrhea ability of Suhuai pig could be improved by selecting and remaining resistant homozygous GG genotype of rs319699771 locus of MUC13 gene and raising the frequency of the resistant homozygous genotype. At the same time, it could also realize the improvements of ham circumference and daily gain of Suhuai pig.
【Background】 MUC13 gene is one of the main genes, which can regulate the infection of enterotoxigenic Escherichia coli F4 ac, and cause diarrhea in piglets before weaning. The rs319699771 locus of the gene(G/A mutation) can accurately identify susceptible and resistant individuals, among which GG type is an anti-diarrhea genotype. The anti-diarrhea molecular breeding of Suhuai pig has been implemented by selecting GG genotype individuals, but whether the selection of GG genotype individuals will have adverse effects on other important economic traits, such as growth, carcass and meat quality, which is not yet clear. 【Objective】 The purpose of this study was to analyze the association between the locus and other economic traits to determine whether the molecular selection based on the rs319699771 locus of anti-diarrhea MUC13 gene would have adverse effects on other economic traits of Suhuai pig. 【Method】 In this experiment, 313 Suhuai fattening pigs weighting 87.61±0.54 kg were tested as experimental animals, and their carcass and meat quality traits were determined through slaughter. 261 Suhuai gilt pigs aging for 161.1±0.5 d were tested as experimental animals, and their growth and body size phenotype were also determined. At the same time, the corresponding ear tissue samples of Suhuai fattening pigs and gilt pigs were collected to extract tissue DNA. After Multiplex-PCR reactions, the polymorphism of the rs319699771 locus of MUC13 gene was detected in each pig. The association analysis between the polymorphism genotype of the rs319699771 locus of MUC13 gene and meat quality, carcass and growth traits were conducted by using the general linear model in SAS software. 【Result】 The results of polymorphism of rs319699771 locus of MUC13 gene showed that among the frequency of anti-diarrhea G allele of rs319699771 locus of MUC13 gene, the male and female pigs of the fattening pigs reached 0.695 and 0.634, respectively, and the anti-diarrhea GG genotype frequency was 0.467 and 0.373,respectively, in the male and female fattening pigs. While the locus G allele among the male and female pigs of the gilt reached 0.690 and 0.705, respectively, and the anti-diarrhea GG genotype frequency was 0.508 and 0.480, respectively, in the male and female gilt pigs. This indicated that the frequency of anti-diarrhea gene in Suhuai pig belonged to a higher level, and it could be feasible for the further improvement of anti-diarrhea GG frequency in the Suhuai pig through molecular breeding. The association analysis between polymorphism of rs319699771 locus of MUC13 gene and economic traits of Suhuai pig showed that there was no significant association between the locus' s polymorphism and carcass, meat quality traits in the fattening pigs(P>0.05), and it could be seen that increasing the breeding of the rs319699771 locus of MUC13 gene in Suhuai fattening pigs would not affect the carcass and meat quality traits. The locus' s polymorphism in the gilt extremely associated with the ham circumference index(P<0.01), and on average,the ham circumference of GG type individuals at this locus was about 1.46 cm longer than that of AG type individuals, and about 3 cm longer than that of AA type individuals. Also, the locus tended to associate with daily gain and terminal measurement weight(P<0.10), GG type individuals showed an upward trend compared with AA and AG type individuals. All of the three traits, GG genotype was a favorable genotype. The results showed that the breeding of the anti-diarrhea GG genotype of this locus could improve the growth traits of Suhuai gilt pigs. 【Conclusion】 Based on these results, the anti-diarrhea allele frequency of the rs319699771 locus of MUC13 gene in Suhuai pig was high, and the anti-diarrhea breeding was feasible, and the anti-diarrhea ability of Suhuai pig could be improved by selecting and remaining resistant homozygous GG genotype of rs319699771 locus of MUC13 gene and raising the frequency of the resistant homozygous genotype. At the same time, it could also realize the improvements of ham circumference and daily gain of Suhuai pig.
引文
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