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1.
苏太猪宰后72 h pH和肉色性状的全基因组关联分析 总被引：1，自引：0，他引：1
【目的】利用全基因组关联分析（GWAS）方法搜寻与苏太猪肉质性状相关的候选基因及分子标记。【方法】屠宰测定了150头苏太猪的背最长肌和半膜肌72 h pH值（包括72 h pH、45 min至72 h pH下降值）及72 h肉色性状（包括红度a,黄度b,亮度L和主观评分）。利用Illumina猪60 K SNP芯片,对这些个体进行基因型判定,用PLINK v1.07对获得的基因型数据进行质量控制,剔除检出率<99.7%、次等位基因频率（minor allele frequency, MAF）<0.05、偏离哈代温伯格（Hardy-Weinberg Equilibrium,HWE）P≤10-5的SNP标记和检出率<90%的个体,最终有150个个体和43 760个SNP用于GWAS研究。利用R语言环境下的GenABEL软件包中的广义线性混合模型,对每个SNP与性状作关联分析,采用Bonferroni方法确定关联显性阈值。群体层化效应的检测通过QQ-plot的结果展示,它通过比较无效假设关联显著性的分布与实际关联性分布的差异来展示可能的群体结构或者显著关联位点。【结果】1.背最长肌72 h pH和半膜肌72 h pH、背最长肌45 min至72 h pH下降值和半膜肌45 min至72 h pH下降值、背最长肌和半膜肌的72 h肌肉黄度、背最长肌和半膜肌的肉色主观评分与肌肉亮度L性状间均为高度相关,且均达到显著水平（P<0.05）。2. 群体层化分析没有发现明显的整体系统偏差,也不存在明显群体层化效应。3.关联分析结果表明共有39个SNPs达到染色体显著水平,分布于基因组上的20个区域（≤10 Mb）;其中,与pH显著关联的SNPs有17个,除了标记ASGA0082337没有定位在猪基因组序列上,其余16个SNPs分别位于3、4、10、14、X号染色体上;与肉色显著关联的SNPs有22个,它们分别位于1、3、7、10、12、14、15号染色体上;但在背最长肌的红度、亮度和肉色主观评分及半膜肌的亮度和肉色主观评分性状中未检测到显著SNPs。 背最长肌和半膜肌的45 min至72 h pH下降值最强关联的SNP位点都为14号染色体上的M1GA0020074和MARC0028756,利用Haploview version 4.2软件开展单倍型分析,结果表明,它们位于一个跨度为433 kb的单倍型框内。【结论】在10、14、15号染色体上存在影响多个肉质指标的一因多效的基因位点,显著位点附近的BNIP3、PRKG1和ADRB3等可能是影响这些性状的候选基因。 相似文献
2.
为了探究猪FTO基因多态性与肉质性状的关联性,试验通过限制性片段长度多态性聚合酶链式反应(polymerase chain reaction-restriction fragment length polymorphism,PCR-RFLP)的BstuⅠ和TaiⅠ限制性内切酶技术分析了豫西黑猪和长白猪FTO基因第3外显子(c.594C>G)和第4内含子(g.276G>T)的遗传多样性,并将FTO基因的基因型与豫西黑猪背膘厚、pH1、pH24、滴水损失、肉色和大理石纹等肉质性状进行了关联分析。研究结果表明:FTO基因的c.594C>G位点和g.276G>T位点都具有中度多态性,经检验c.594C>G位点和g.276G>T位点的基因频率均符合χ2检验的Hardy-Weinberg平衡定律(P>0.05)。在c.594C>G位点上,豫西黑猪和长白猪都存在3种不同的基因型,分别为CC、CG和GG基因型,优势等位基因都为C等位基因,且两者C等位基因的频率分别为0.522 7和0.533 3,在肉色评分上,CG基因型和GG基因型个体显著高于CC基因型(P<0.05)。在g.276G>T位点上,豫西黑猪和长白猪都存在3种不同的基因型,分别为GG、GT和TT基因型,优势等位基因均为T等位基因(0.574 1,1.648 1)。结果表明,FTO基因的c.594C>G位点与豫西黑猪的肉质性状具有显著关联性,这在一定程度上说明了FTO基因可以为豫西黑猪肉质性状的遗传选择提供参考依据。 相似文献
3.
Meat quality is one of the most important economic traits in pig breeding. It has been reported that the composition of type II muscle fibers is correlated with meat quality in pigs. Type II muscle fibers contain three isoforms, IIa, IIb and IIx, which contain specific myofibrillar proteins MYH2, MYH4 and MYH1, respectively. In this study, the expression levels of MYH1, MYH2, and MYH4 genes in the Longissimus thoracis (LT) muscle were measured in 114 Yorkshire pigs. Further, the correlations between the expression level of MYH genes and the meat quality traits of intramuscular fat, drip loss, water-holding capacity and postmortem pH values were analyzed. The results showed that the expression level of MYH2 was positively correlated with the intramuscular fat (R= 0.20, P<0.05). The expression levels of MHY1 and MYH4 were negatively correlated with the pH at 24 h post mortem (pH24h ; R= －0.28, P<0.01; R= －0.25, P<0.01, respectively). Besides, the 60K SNP chip was used for genotyping the individuals. Genome wide association analysis indicated that 15 SNPs were significantly associated with the expression levels of these three MYH genes. The results indicated the expression levels of MYH1, MYH2 and MYH4 genes could be useful markers for improvement of meat quality in pigs. 相似文献
4.
不同猪种生长性能及胴体品质的差异对肉品加工的影响 总被引：3，自引：0，他引：3
以杜洛克猪、长白猪和约克夏猪为研究对象 ,选取具有较高经济价值的生长发育性状和对肉品加工过程有较大影响的几个胴体以及肉质性状为研究重点 ,结合种猪性能测定进行了 3品种的比较研究。结果表明 :约克夏猪的生长速度最快且背膘最薄 ,长白猪其次 ,杜洛克猪生长最慢 ,背膘最厚 ;3个品种的试验猪中都没有PSE肉产生 ,具有优良的肉质性状。杜洛克猪的肉质性状最好 ,其大理石纹评分 (3 6 2 5分 )和肌内脂肪含量 (3 5 6 % )均极显著地高于了长白猪 (1 786分和 1 16 4 % )和约克夏 (2 14 3分和 1 2 39% )。 3品种中杜洛克具有最高的屠宰率 (71 5 % )和脂肪率 (2 5 92 % ) ,约克夏具有最小的 3点平均背膘厚 (1 4 0 7cm)和最高的腿臀比 (34 33% ) ;长白猪的胴体瘦肉率 (6 5 96 % )最高 相似文献
5.
新疆褐牛基因外显子多态性及其与SCS和泌乳性状关联性分析 总被引：1，自引：0，他引：1
【目的】探索ERAP2,Cwc27,PPFIBP2,THADA,ZNF804B和AMHR2基因多态性与新疆褐牛体细胞评分及泌乳性状的相关性,旨在寻找与新疆褐牛体细胞评分及泌乳性状相关的分子标记。【方法】以新疆乌鲁木齐种牛场、新疆天山畜牧生物工程股份有限公司共169头新疆褐牛母牛为试验对象,以2008—2015年间的生产性能测定记录(包括乳脂率、乳蛋白率、总固体含量、乳糖率和体细胞计数等)和305 d产奶量为试验数据,基于课题组前期15头中国荷斯坦牛DNA混池重测序的结果筛选外显子区域10个SNPs,采用基质辅助激光电离飞行时间质谱法(sequenom mass Array genotype)分型技术验证10个SNP位点的遗传多态性,运用SAS8.1软件GLM过程对这10个SNP突变与新疆褐牛体细胞评分(SCS)、305 d产奶量、乳脂率、乳蛋白率、乳糖率和总固体的关联程度进行统计分析。【结果】10个SNP位点均具有多态性,χ~2检验表明群体中9个SNP位点符合Hardy-Weinberg平衡状态。关联分析结果表明ERAP2基因两个位点(T98741711C和G98736141A)均与新疆褐牛305 d产奶量达到极显著关联(P0.001),其中TT型和GG型个体的产奶量最高;PPFIBP2(C45667492G)位点与新疆褐牛乳糖率达到显著关联(P0.005),其中GG型个体的乳糖率最高;Cwc27(T14533269A)位点与新疆褐牛乳脂率和总固体含量达到显著关联(P0.005),与SCS达到极显著关联(P0.001),其中TT型个体的乳脂率和总固体含量均最高,AA型个体的SCS极显著高于AT和TT型;AMHR2(C26758055G)位点与新疆褐牛乳蛋白率和总固体含量达到极显著关联(P0.001),其中GG型个体显著高于CC和GC型个体。连锁不平衡分析与单倍型构建的结果发现10个SNPs构建了两个单倍型模块,其中SNP1和SNP2位点之间处于连锁不平衡状态(r20.3),SNP4和SNP10位点之间处于强连锁不平衡状态(r20.6),随后分析了单倍型与SCS和泌乳性状之间的相关性,发现单倍型与新疆褐牛SCS和泌乳性状无显著关联(P0.001)。【结论】初步发现了ERAP2,Cwc27,PPFIBP2和AMHR2与新疆褐牛SCS和泌乳性能相关,结果可为新疆褐牛产奶性状的分子标记辅助选育提供参考和依据。 相似文献
6.
Backfat thickness is a good predictor of carcass lean content, an economically important trait, and a main breeding target in pig improvement. In this study, the candidate genes and genomic regions associated with the tenth rib backfat thickness trait were identified in two independent pig populations, using a genome-wide association study of porcine 60K SNP genotype data applying the compressed mixed linear model (CMLM) statistical method. For each population, 30 most significant single-nucleotide polymorphisms (SNPs) were selected and SNP annotation implemented using Sus scrofa Build 10.2. In the first population, 25 significant SNPs were distributed on seven chromosomes, and SNPs on SSC1 and SSC7 showed great significance for fat deposition. The most significant SNP (ALGA0006623) was located on SSC1, upstream of the MC4R gene. In the second population, 27 significant SNPs were recognized by annotation, and 12 SNPs on SSC12 were related to fat deposition. Two haplotype blocks, M1GA0016251-MARC0075799 and ALGA0065251-MARC0014203-M1GA0016298-ALGA0065308, were detected in significant regions where the PIPNC1 and GH1 genes were identified as contributing to fat metabolism. The results indicated that genetic mechanism regulating backfat thickness is complex, and that genome-wide associations can be affected by populations with different genetic backgrounds. 相似文献
7.
XU Zhong SUN Hao ZHANG Zhe Zhao Qing-bo Babatunde Shittu Olasege Li Qiu-meng Yue Yang Ma Pei-pei Zhang Xiang-zhe Wang Qi-shan Pan Yu-chun 《农业科学学报》2020,19(5):1314-1322
The aim of this study was to detect evidence for signatures of recent selection in the Jinhua pig genome. These results can be useful to better understand the regions under selection in Jinhua pigs and might shed some lights on groups of genes that control production traits. In the present study, we performed extended haplotype homozygosity(EHH) tests to identify significant core regions in 202 Jinhua pigs. A total of 26 161 core regions spanning 636.42 Mb were identified, which occupied approximately 28% of the genome across all autosomes, and 1 158 significant(P0.01) core haplotypes were selected. Genes in these regions were related to several economically important traits, including meat quality, reproduction, immune responses and exterior traits. A panel of genes including ssc-mir-365-2, KDM8, RABEP2, GSG1L, RHEB, RPH3AL and a signal pathway of PI3K-Akt were detected with the most extreme P-values. The findings in our study could draw a comparatively genome-wide map of selection signature in the pig genome, and also help to detect functional candidate genes under positive selection for further genetic and breeding research in Jinhua and other pigs. 相似文献
8.
为了解富集环境对育肥猪生产性能、胴体品质和肉质影响,将杜长大(杜洛克×长白×大白n=60)、大杜民(大白×杜洛克×民猪n=60)和杜长民(杜洛克×长白×民猪n=60)育肥猪分别饲养在富集和贫瘠环境圈舍,测定其生产性能,胴体品质及肉质。结果表明,畜舍环境对育肥猪生产性能和胴体品质无显著影响(P0.05),但富集环境中育肥猪屠宰后24 h肌肉p H(p H24)显著高于贫瘠环境(P0.05);与大杜民和杜长民相比,杜长大生长至100 kg时间短(P0.001),日增重和胴体眼肌面积较大(P0.05),胴体平均背膘厚较小(P0.05);大杜民和杜长民p H24显著高于杜长大(P0.05)、肉色亮度(L*)显著低于杜长大(P0.05)。富集环境对育肥猪生产性能和胴体品质无显著影响,但有助于改善肉质。民猪杂交育肥猪生产性能稍差,胴体脂肪比例偏高,肉多汁性较好。 相似文献
9.
Shu-qi DIAO Zhi-ting XU Shao-pan YE Shu-wen HUANG Jin-yan TENG Xiao-long YUAN Zan-mou CHEN Hao ZHANG Jia-qi LI Zhe ZHANG 《农业科学学报》2021,20(5):1359-1371
To explore the genetic features and signatures of selection in indigenous pigs from South China and Duroc pigs, 259 pigs from six populations were genotyped using single-nucleotide polymorphism(SNP) BeadChips. Principal component analysis(PCA), effective population size(Ne), linkage disequilibrium(LD), and signatures of selection were explored and investigated among the six pig populations. The results showed the Ne of five South China indigenous pig populations has been decreasing rapidly since 100 generations ago. The LD between pairwise SNP distance at 100 kb ranged from 0.16 to 0.20 for the five indigenous pig populations, while it was 0.32 for the Duroc population. However, the LD of all six pig populations showed the opposite order at long distances(5 Mb). Furthermore, 15 potential signatures of selection associated with meat quality and age at puberty were exclusively detected in South China indigenous pigs, while eight potential signatures of selection associated with growth traits were detected in Duroc pigs. Our work provides valuable insights for the utilization and conservation of South China indigenous pigs. 相似文献
10.
【目的】 利用全基因组关联分析定位影响杜长大猪（DLY）、二花脸猪（EHL）和莱芜猪（LW）3个群体25种血液性状的染色体位点,为最后鉴定影响这些性状的因果基因提供前期基础,同时为猪抗病育种和生产提供参考。【方法】将610头杜长大三元杂猪在（180±5）日龄,336头二花脸猪和333头莱芜猪在（300±5）日龄进行统一屠宰。收集2 mL血液于抗凝管中,利用全自动生化分析仪进行25种血液性状的血常规检测。采集猪耳组织提取DNA并测浓度和质量。将质检合格的DNA样品利用Illumina 60K SNP芯片进行基因型判定。运用PLINK软件对判型结果进行质量控制,将合格的SNP标记用于后续的关联分析。使用R语言GenABEL软件包中的广义混合线性模型进行全基因组关联分析,定位影响3个群体25种血常规性状的显著性染色体位点。据全基因组关联分析结果,在Ensembl或NCBI网站上搜寻潜在的位置候选基因。【结果】杜长大猪、二花脸猪和莱芜猪三个群体通过质控的有效表型数据个体数分别为552头、325头和281头。60K SNPs经过质量控制过后,杜长大猪剩余56 216 SNPs,莱芜猪剩余49 343 SNPs,二花脸猪剩余35 974 SNPs,用于Meta分析的SNPs共有32 967。运用全基因组关联分析和Meta分析共定位到610个显著影响3个群体25种血液性状的SNPs,其中135个SNPs达基因组显著水平,475个SNPs达建议水平;分布在所有染色体上。在杜长大猪中共鉴别到32个基因组显著水平SNPs以及85个建议水平SNPs,且8种性状有基因组显著水平的SNPs,分别是淋巴细胞数目（LYM）、淋巴细胞比率（LYMR）、嗜碱性粒细胞数目（BAS）、嗜碱性粒细胞比率（BASR）、平均红细胞体积（MCV）、红细胞分布宽度变异系数（RDW_CV）、平均红细胞血红蛋白含量（MCH）和血小板分布宽度（PDW）。在二花脸猪中共鉴别到33个基因组显著水平SNPs以及139个建议水平SNPs,且9种性状有基因组显著水平的SNPs,分别是LYM、MCH、平均红细胞血红蛋白浓度（MCHC）、单核细胞数目（MON）、单核细胞比率（MONR）、平均血小板体积（MPV）、中性粒细胞比率（NEUR）、大血小板细胞（P_LCC）以及血小板压积（PCT）。在莱芜猪中共鉴别到54个基因组显著水平SNPs以及169个建议水平SNPs,且6种性状有基因组显著水平的SNPs,分别是BASR、红细胞压积（HCT）、MCH、MCHC、MCV和红细胞数目（RBC）。在Meta分析结果中,共鉴别到16个基因组显著水平SNPs以及82个建议水平SNPs,且6种性状有基因组显著水平SNPs,分别是RBC、HCT、MCH、MCHC、MCV以及MON。通过在Ensembl或NCBI网站上搜寻最强相关SNP区域内的候选基因,初步将F13A1、SPTA1、DBNL、SLC25A28、CTSC基因分别确定为影响BASR、HCT、LYM、MCHC、NEUR的重要候选基因。【结论】通过全基因组关联分析和Meta分析共得到610个显著影响杜长大猪、二花脸猪和莱芜猪3个群体25种血液性状的SNP位点,初步确定F13A1、SPTA1、DBNL、SLC25A28和CTSC基因分别是BASR、HCT、LYM、MCHC和NEUR的重要位置候选基因,为解析商业猪和纯种地方猪的血液性状或免疫性疾病提供重要参考。 相似文献
11.
【目的】通过基于单倍型的病例-对照全基因组关联分析(GWAS)鉴别白色杜洛克×二花脸F2资源家系中影响猪阴囊疝的易感位点及位置功能候选基因,并在远缘纯种猪阴囊疝三联体核心家系（Trio）群体中进行重复验证。【方法】利用Illumina porcine 60K SNP芯片对1 020头白色杜洛克×二花脸F2资源家系阴囊疝群体(包含19个阴囊疝患病个体)进行扫描获取基因型。通过Plink v1.07软件对基因型数据进行质量控制;剔除个体基因型检出率< 90%的个体,剔除SNP位点检出率< 90%、哈迪温伯格平衡卡方检验P≤10-3和最小等位基因频率< 0.05及性染色体上和无法定位的SNP位点。质控合格的SNP位点用PHASEBOOK构建出F2资源家系中每个个体的单倍型,并采用隐马尔可夫模型将其归类到数目预先定义的祖先单倍型中。使用基于广义线性混合模型的GLASCOW软件进行利用祖先单倍型的病例-对照全基因组关联分析。采用保守的Bonferroni校正方法得到基因组显著水平和染色体显著水平的阈值。对F2资源家系中达到染色体显著水平的易感SNP位点在包含237个患病个体的远缘纯种猪阴囊疝三联体核心家系(Trio)群体中进行同样的质控,并利用Haploview软件对质控合格的SNP位点分别展开基于单点和基于单倍型的传递不平衡分析(TDT),进行重复验证。【结果】白色杜洛克×二花脸F2资源家系中全部个体的38 033个SNP标记通过质控。在GWAS分析中,共发现108个达染色体显著水平(P<2.63×10-5)的猪阴囊疝关联SNP位点,分别位于染色体2、8和17上,最强相关的SNP位点位于17号染色体上。在远缘三联体核心家系群中,724个个体的96个SNP位点通过质控。对质控合格的SNP位点进行基于单点的TDT分析,结果发现5个显著相关的SNP位点得到重复验证(P<0.05),其中2号染色体上有1个SNP位点和17号染色体上有4个SNP位点,分别位于IQGAP2,CHMP4B,SERINC3,ZNF334 等4个基因内或其上下游。基于单倍型的TDT验证分析发现两个易感单倍型框,其中与基于单点TDT验证分析有重合的仅有SSC17上CHMP4B内及下游的两个易感位点。结合疝气发生机制及TDT分析结果,推测IQGAP2和CHMP4B可能是影响猪阴囊疝发生的两个重要的位置功能候选基因。【结论】本研究利用基于小样本的GWAS分析和较大样本群验证分析,在SSC2和SSC17上分别鉴别1个和4个阴囊疝易感位点,在SSC17上鉴别到两个易感单倍型。易感位点附近的2个基因IQGAP2和CHMP4B可能是影响猪阴囊疝发生的位置功能候选基因,值得进一步研究。 相似文献
12.
Genome-wide association study for rib eye muscle area in a Large White×Minzhu F_2 pig resource population 
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下载免费PDF全文 Rib eye muscle area(REMA) is an economically important trait and one of the main selection criteria for breeding in the swine industry. In the genome-wide association study(GWAS), the Illumina Porcine SNP60 Bead Chip containing 62 163 single nucleotide polymorphisms(SNPs) was used to genotype 557 pigs from a porcine Large White×Minzhu intercross population. The REMA(at the 5th–6th, 10th–11th and the last ribs) was measured after slaughtered at the age of(240±7) d for each animal. Association tests between REMA trait and SNPs were performed via the Genome-Wide Rapid Association using the Mixed Model and Regression-Genomic Control(GRAMMAR-GC) approach. From the Ensembl porcine database, SNP annotation was implemented using Sus scrofa Build 10.2. Thirty-three SNPs on SSC12 and 3 SNPs on SSC2 showed significant association with REMA at the last rib at the chromosome-wide significance level. None of the SNPs of REMA at the 5th–6th rib and only a few numbers of the SNPs of REMA at the 10th–11th ribs were found in this study. The Haploview V3.31 program and the Haplo.Stats R package were used to detect and visualize haplotype blocks and to analyze the association of the detected haplotype blocks with REMA at the last rib. A linkage analysis revealed that 4 haplotype blocks contained 4, 4, 2, and 4 SNPs, respectively. Annotations from pig reference genome suggested 2 genes(NOS2, NLK) in block 1(266 kb), one gene(TMIGD1) in block 2(348 kb), and one gene(MAP2K4) in block 3(453 kb). A functional analysis indicated that MYH3 and MYH13 genes are the potential genes controlling REMA at the last rib. We screened several candidate intervals and genes based on the SNPs location and the gene function, and inferred that NOS2 and NLK genes maybe the main genes of REMA at the last ribs. 相似文献
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目的 Wnt信号通路在动物皮肤毛囊的发生发育中具有重要作用, 前期研究结果表明Wnt3a可能是影响鸡皮肤毛囊密度性状的重要候选基因。为进一步验证Wnt3a在皮肤毛囊生长发育中的作用, 研究以金陵花鸡为研究对象, 筛选Wnt3a SNPs, 并分析其与毛囊密度性状的相关性, 以期找到对皮肤毛囊密度有显著影响的分子标记, 为培育屠体美观的屠宰型肉鸡的“分子编写育种”提供参考。方法 采用PCR扩增直接测序法对Wnt3a 的SNPs位点进行筛查, 分析单个SNP标记与皮肤毛囊密度性状的相关性。采用Haploview软件分析这些SNP位点的连锁不平衡（LD）程度, 并分析不同单倍型组合与毛囊密度性状的相关性。结果 共发现14个SNP位点, 在第2外显子发现1个SNP位点（SNP1）, 为同义突变;第2内含子发现4个突变位点（ SNP2—SNP5）, 在第3内含子发现9个SNP位点（SNP6—SNP14）。卡方检验表明, 第2外显子的1个突变位点（SNP1）和第2内含子的3个突变位点（SNP3—SNP5）的3个位点均处于哈代-温伯格平衡状态（P>0.05）, 第3内含子的9个SNPs（SNP6-SNP14）偏离哈代-温伯格平衡（P<0.05）。SNP1—SNP5的He均小于0.50, PIC均小于0.25, 这5个SNP位点遗传多样性较低。第3内含子的9个突变位点, SNP6、SNP7、SNP9位点PIC<0.25, 其他6个突变位点 0.25< PIC<0.5, 为中度多态。单标记关联分析表明, 公、母鸡SNP2位点的AG基因型的毛囊密度显著高于GG基因型（P< 0.05）;母鸡SNP8位点的AA与GG基因型的毛囊密度显著高于AG基因型（P < 0.05）, 在公鸡中3种基因型的毛囊密度差异不显著。14个SNPs连锁不平衡分析表明, SNP3、SNP4和SNP5的强连锁产生了2种单倍型, H1（GAT）频率为0.882和H2（TCC）频率为0.118;SNP6—SNP13之间的强连锁产生了5种单倍型, 其中H1（ACATTATC）和H2（ACGTCCCA）, H3（ACGTTCCA）, H4（GTGCTATA）, H5（ACGTCCCC）, 单倍型频率分别为0.469、0.275、0.123、0.113、0.014。SNP3、SNP4和SNP5连锁产生的2 种单倍型组合后产生了3种单倍型组合, 关联分析发现在公、母鸡中3种单倍型组合的毛囊密度均差异不显著;将SNP6—SNP13连锁产生的5种主要单倍型组合后, 公鸡有7种组合单倍型组合, 毛孔数量差异不显著;母鸡有8种主要单倍型组合, 其中H1H1（AACCAATTTTAATTCC）毛囊密度最大。SNP2和SNP8位点与皮肤毛囊密度显著相关, 单倍型组合H1H1（AGAA）、H1H2（AGAG）为母鸡优势单倍型。结论 筛选到Wnt3a的14个SNPs位点, 其中, SNP2（rs2587721 G >A）和SNP8（rs2555967G>A）位点与毛囊密度显著相关, 8个SNPs（SNP6—SNP13）位点处于强连锁不平衡, 母鸡H1H1单倍型毛囊密度最大。Wnt3a的SNP2和SNP8位点的单倍型组合H1H1（AGAA）、H1H2（AGAG）和SNP6—SNP13连锁产生的H1H1（AACCAATTTTAATTCC）单倍型组合与母鸡毛囊密度显著相关, 可以为鸡毛囊密度“分子编写育种”提供重要遗传信息。 相似文献
14.
《农业科学学报》2016,(1)
Domesticated sheep have been exposed to artificial selection for the production of fiber, meat, and milk as well as to natural selection. Such selections are likely to have imposed distinctive selection signatures on the sheep genome. Therefore, detecting selection signatures across the genome may help elucidate mechanisms of selection and pinpoint candidate genes of interest for further investigation. Here, detection of selection signatures was conducted in three sheep breeds, Sunite(n=66), German Mutton(n=159), and Dorper(n=93), using the Illumina Ovine SNP50 Genotyping Bead Chip array. Each animal provided genotype information for 43 273 autosomal single nucleotide polymorphisms(SNPs). We adopted two complementary haplotype-based statistics of relative extended haplotype homozygosity(REHH) and the cross-population extended haplotype homozygosity(XP-EHH) tests. In total, 707, 755, and 438 genomic regions subjected to positive selection were identified in Sunite, German Mutton, and Dorper sheep, respectively, and 42 of these regions were detected using both REHH and XP-EHH analyses. These genomic regions harbored many important genes, which were enriched in gene ontology terms involved in muscle development, growth, and fat metabolism. Fourteen of these genomic regions overlapped with those identified in our previous genome-wide association studies, further indicating that these genes under positive selection may underlie growth developmental traits. These findings contribute to the identification of candidate genes of interest and aid in understanding the evolutionary and biological mechanisms for controlling complex traits in Chinese and western sheep. 相似文献
15.
选取长白猪、约克夏猪和新荣昌猪为研究对象 ,通过对各品种试猪及其杂交猪的相关性状分析表明 :在肌纤维生长、肉质性状和胴体性状的表现上都存在不同程度的杂种优势效应。尤其在肉质性状上 ,本次试验中的两种杂交猪均存在有利于肉质改善的正向杂种优势 相似文献
16.
旨在研究反转录转座子1基因(retrotransposon-like-1,RTL1)潜在的变异与猪胴体和肉质性状的相关性。测序发现在猪RTL1基因编码区1 209 bp处存在G/A突变,利用PCR-Fnu4H I-RFLP方法在9个猪种中进行了基因分型,并且在360头大白猪×梅山猪F2代群体中进行性状关联分析。结果表明,该位点与皮率、内脂率、6-7腰椎间膘厚、胸腰椎间膘厚、背最长肌pH、股二头肌肌肉色值呈显著相关(P0.05),与骨率、肩部膘厚、臀部膘厚、平均背膘厚、背最长肌失水率、背最长肌系水力、背最长肌肌肉色值呈极显著相关(P0.01)。 相似文献
17.
Epigenome-wide DNA methylation analysis reveals differentially methylation patterns in skeletal muscle between Chinese Chenghua and Qingyu pigs 下载免费PDF全文
下载免费PDF全文 WANG Kai WU Ping-xian WANG Shu-jie JI Xiang CHEN Dong JIANG An-an XIAO Wei-hang JIANG Yan-zhi ZHU Li ZENG Yang-shuang XU Xu QIU Xiao-tian LI Ming-zhou LI Xue-wei TANG Guo-qing 《农业科学学报》2022,21(6):1731-1739
Chenghua (CH) pig and Qingyu (QY) pig are typical Chinese native fatty breeds. CH pig is mainly distributed in Chengdu Plain, while QY pig is widely distributed throughout the mountain areas around the Sichuan Basin. There are significant differences in their phenotypic traits, including body image, growth performance, and meat quality. This study compared several meat quality traits of CH and QY pigs and conducted a genome-wide DNA methylation analysis using reduced representation bisulfite sequencing (RRBS). It was observed that the pH at 45 min (pH45min, P=5.22e–13), lightness at 45 min (L*45min, P=4.85e–5), and lightness at 24 h (L*24h, P=3.57e–5) of CH pigs were higher than those of QY pigs. We detected 10 699 differentially methylated cytosines (DMCs) and 2 760 differentially methylated genes (DMGs) associated with these DMCs. Functional analysis showed that these DMGs were mainly enriched in the AMPK signaling pathway, Type II diabetes mellitus, Insulin signaling pathway, mTOR signaling pathway, and Insulin resistance. Furthermore, 15 DMGs were associated with fat metabolism (ACACA, CAB39, CRADD, CRTC2, FASN, and GCK), muscle development (HK2, IKBKB, MTOR, PIK3CD, PPARGC1A, and RPTOR), or meat quality traits (PCK1, PRKAG2, and SLC2A4). The findings may help to understand further the epigenetic regulation mechanisms of meat quality traits in pigs and provide new basic data for the study of local pigs. 相似文献
18.
【目的】明确藏猪和杜藏猪(杜洛克父本与藏猪母本杂交F1代)的生长和胴体性状及肉质指标等表型差异,并分析背最长肌中脂肪沉积相关基因的表达差异,为藏猪种质资源利用及猪脂肪沉积规律研究提供参考依据。【方法】以藏猪和杜藏猪为研究对象,分别测定其体长、体高和胸围等生长性状,屠宰率、背膘厚及眼肌面积等胴体性状,以及pH、肉色、蒸煮损失及肌内脂肪含量等肉质指标;并通过荧光实时定量PCR检测脂肪沉积相关基因在2种猪背最长肌中的表达情况。【结果】杜藏猪的左胴体重、右胴体重、屠宰前重、胴体长、体长、体高、管围和胸围均高于藏猪,且差异显著(P<0.05,下同),眼肌面积(33.00±3.84 cm2)也显著大于藏猪(16.83±1.81 cm2),背膘厚(13.15±2.48 mm)则显著低于藏猪(22.83±2.80 mm),藏猪与杜藏猪的皮厚、腹围和屠宰率无显著差异(P>0.05,下同);杜藏猪肌肉的pH-24 h、熟肉率、剪切力和含水率显著高于藏猪肌肉,而杜藏猪肉色的a-24 h值(10.30±1.06)和肌内脂肪含量[(2.48±1.44)%]显著低于藏猪。除GHR基因外,其他脂肪沉积相关基因的相对表达量均表现为杜藏猪低于藏猪,其中,ADIPOQ基因和FASN基因的相对表达量显著低于藏猪,IGF1基因、TNFa基因和Leptin基因的相对表达量极显著低于藏猪(P<0.01)。相关分析结果显示,GHR基因相对表达量与杜藏猪肌内脂肪含量呈显著正相关,FASN基因相对表达量与藏猪肌内脂肪含量呈显著正相关,IGF1基因相对表达量与藏猪背膘呈显著负相关。【结论】杜藏猪的肉质性状与藏猪相似,但杜藏猪具有更佳的生长性能,说明以杜洛克为父本与藏猪母本杂交得到的杜藏猪具有更优的生产效率。藏猪和杜藏猪的肌内脂肪含量差异与脂肪沉积相关基因的表达差异有关,即猪的肌内脂肪含量受多种脂肪沉积相关基因调控。 相似文献
19.
山东省猪种mtDNA CytB基因遗传多样性及系统进化研究 总被引：3，自引：0，他引：3
【目的】利用mtDNA CytB基因为标记,从分子水平探讨12个猪种166个样本（8个山东省猪种,3个引进猪种和梅山猪种）的遗传多样性和各猪种间的亲缘关系,为山东省猪种合理利用以及生物多样性保护提供基础资料。【方法】对各猪种样本mtDNA CytB基因进行PCR扩增和测序,采用现代生物信息学方法进行数据处理分析。【结果】山东8个猪种种内遗传变异和种间遗传距离均较小,有共享单倍型。山东各猪种和梅山猪与大约克的遗传距离也较小,但与引进猪种杜洛克和长白的遗传距离较大。利用分子系统进化树和CytB基因4个SNP位点的分类方法将上述样本分为2个独立的支系,第一支以中国猪种为主,将除鲁烟白猪的一种单倍型在内的所有山东猪种、梅山猪和大约克的两种单倍型聚为一类,第二支以引进猪种为主,将长白、杜洛克、大约克的一种单倍型和鲁烟白猪的一种单倍型聚为一类。【结论】山东猪种有共同的母系祖先,品种内母系遗传多样性较贫乏;外来猪种引入山东后主要是用作父本以提高生产速度和瘦肉率等,对本地猪种未有母系贡献;利用CytB基因4个SNP位点对欧洲单倍型和亚洲单倍型的分类方法,可以方便地估测利用中外猪种结合培育的猪新品种（配套系）的母系血统情况。 相似文献
20.
【目的】揭示ARHGEF37基因多态性及其对猪生长性状的影响,为利用该基因标记推进滇撒猪配套系的进一步选育及开发利用提供参考依据。【方法】以274头杜撒♂×大长撒♀F1代猪为试验材料,采用PCR扩增产物直接测序法检测ARHGEF37基因外显子8多态性,采用最小二乘模型分析各SNP位点基因型及单倍型组合对5个生长性状的影响。【结果】在杜撒♂×大长撒♀F1代猪ARHGEF37基因外显子8上检测出C1262G、T1293C、G1395A和C1398T 4个SNPs位点,分别以CC、TT、GA、CC基因型、等位基因C、T、G、C及单倍型CTGC的频率最高;除T1293C位点外,其余各位点的杂合度在0.4552~0.4940,遗传多样性较丰富。C1262G位点GG基因型个体达100 kg体重日龄(258.93±2.95 d)显著高于CG基因型个体(249.87±2.68 d)(P<0.05,下同),CG基因型个体30~60 kg日增重(462.44±15.44 g)显著高于CC基因型个体(409.29±14.30 g);T1293C位点TT基因型个体30~60 kg日增重(445.04±9.70 g)极显著高于TC基因型个体(329.33±42.26 g)(P<0.01),TT基因型个体30~100 kg日增重(516.96±6.44 g)显著高于TC基因型和CC基因型个体(470.92±28.08 g和480.64±16.94 g)。此外,达60 kg体重日龄和达100 kg体重日龄均以CTGC/GTGC组合最短(161.84±5.07 d和241.00±5.11 d),CTGC/CCGC组合最长(188.80±11.33 d和272.60±11.42 d);30~60 kg日增重和30~100 kg日增重分别以CTGC/GTAT组合和CTGC/GTGC组合最高(479.56±20.66 g和545.42±19.76 g),均以CTAC/CCGC组合最低(275.00±84.33 g和437.00±55.88 g)。【结论】ARHGEF37基因的G1395A和C1398T位点的遗传多样性较丰富;C1262G位点的CG基因型、T1293C位点的TT基因型及CTGC/GTGC单倍型组合对杜撒♂×大长撒♀F1代生长性状的影响较大,携带有CTGC单倍型个体的各生长性状均处于较高水平。 相似文献