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1.
The Duroc pig has high adaptability and feeding efficiency, making it one of the most popular pig breeds worldwide. Over long periods of natural and artificial selection, genetic footprints, i.e., selective signatures, were left in the genome. In this study, a Duroc pig population (n=715) was genotyped with the Porcine SNP60K Bead Chip and the GeneSeek Genomic Profiler (GGP) Porcine Chip. The relative extended haplotype homozygosity (REHH) method was used for selective signature detection in a subset of the population (n=368), selected to represent a balanced family structure. In total, 154 significant core regions were detected as selective signatures (P<0.01), some of which overlap with previously reported quantitative trait loci associated with several economically important traits, including average daily gain and backfat thickness. Genome annotation for these significant core regions revealed a variety of interesting candidate genes including GATA3, TAF3, ATP5C1, and FGF1. These genes were functionally related to anterior/posterior pattern specification, phosphatidylinositol 3-kinase signaling, embryonic skeletal system morphogenesis, and oxidation-reduction processes. This research provides knowledge for the study of selection mechanisms and breeding practices in Duroc and other pigs.  相似文献   

2.
【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   

3.
利用PCR-SSCP技术,对约克夏、杜洛克、长白猪、金华猪、碧湖猪和嵊县花猪共6个品种258头猪的PPARγ2基因外显子1进行多态性分析,并采用SPSS程序中GLM模型分析该位点与胴体性状的相关性。研究结果发现编码区175 bp处存在A175G单核苷酸多态。国内外猪种的基因型频率间存在较大差异,在国外种猪中,AA基因型频率较高,国内猪种中AG基因型频率较高。相关性分析结果表明,在长白猪群中,PPARγ2基因与肩部背膘厚、腰荐结合部背膘厚均存在极显著相关性(P<0.01),与6/7th肋背膘厚和眼肌面积均存在显著相关性(P<0.05)。在金华猪群内,PPARγ2基因与肩部背膘厚显著相关(P<0.05)。因此推测PPARγ2基因可能是影响猪胴体性状的潜在分子育种标记。  相似文献   

4.
Erhualian (E), Meishan (MS) and Mi (MI) pigs are excellent indigenous pig breeds in Chinese Taihu Basin, which have made great contributions to the genetic improvement of commercial pigs. Investigation of the genetic structure and inbreeding level of the 3 pig breeds is of great significance for the sustainable breeding of commercial pigs. The length and number of runs of homozygosity (ROH) as well as the frequency of genomes covered by ROH can be used as indicators to evaluate the level of inbreeding and the origin of the population. In this study, the ROH characteristics of E, MS, MI and Landrace (L) pigs were analyzed by SLAF-seq data, and the inbreeding coefficient based on ROH (FROH) was calculated. In addition, we have identified candidate genes in the genomic regions associated with ROH. A total of 10568 ROH were detected in 116 individuals of 4 pig breeds. The analysis showed that there were significant differences in genetic structure between 3 Taihu Basin pig breeds and L, and the genetic structure of E and MI was similar. The results of FROH showed that the inbreeding level of MS was the highest (0.25±0.07), while E and MI were lower than L. Compared with the other 3 pig populations, MS showed a higher frequency of long ROH (>5 Mb), indicating higher inbreeding in MS in recent generations. A large number of candidate genes related to reproductive traits are located in the genomic regions with a high frequency of ROH, and these genes are expected to be used as candidate genes in marker-assisted selection (MAS) breeding programs. Our findings can provide theoretical support for genetic conservation and genetic improvement of 3 pig breeds in Chinese Taihu Basin.  相似文献   

5.
猪POU1F1基因启动子区多态分析及其与生长性状的关联   总被引：2，自引：1，他引：1  
 【目的】获得猪POU1F1基因启动子区的多态信息,揭示其在不同品种中的分布特点,阐明其与生长性状的关联性。【方法】采用PCR克隆、DNA测序和PCR-RFLP技术进行POU1F1基因启动子区多态分析,利用一般线形模型分析其与生长性状的关联性。【结果】在POU1F1基因1.5 kb的启动子区域内发现5个多态位点;其中,5 bp短片段插入或缺失突变的A等位基因频率在引入品种猪中最高,在培育品种中中等,在中国地方品种最低。一般线形模型分析表明,该多态位点与猪的生长性状存在显著相关。多重比较分析发现,AA基因型个体的体高、体长、胸围和体重显著高于AB和BB基因型个体（P＜0.05）,而AB和BB基因型个体的体高、胸围和体重差异不显著（P＞0.05）,但AB基因型个体的体长显著高于BB基因型个体（P＜0.05）。【结论】5 bp短片段插入或缺失突变的A等位基因是生长性状的优势等位基因,是生长性状可能的分子标记。  相似文献   

6.
选取FSHβ基因为影响猪繁殖性状候选基因,对8个猪种906头猪进行FSHβ基因的多态性分析,并采用最小二乘法分析了其对总产仔数、产活仔数和妊娠期的遗传效应。结果显示,FSHβ基因在嘉兴黑猪、巴马香猪、金华猪和八眉猪中几乎只有A等位基因,在美系杜洛克和嵊县花猪中以B等位基因为主,只有在大约克、长白、台系杜洛克中A,B等位基因均衡分布。遗传效应分析表明,在初产美系杜洛克猪中,BB基因型妊娠期比AB型缩短0.94 d（P<0.01）;在初产大约克猪中,BB基因型妊娠期比AA型缩短1.61 d（P<0.01）;在经产长白猪中,AB型产仔数和产活仔数分别比BB型多了227头（P<0.05）和231头（P<0.05）。总体而言,FSHβ基因对不同品种母猪繁殖性能效应各有差异,在初产美系杜洛克和大约克中BB基因型妊娠期更短,在经产长白猪中AB型产仔数和产活仔数更多。  相似文献   

7.
Meat quality is an important trait in the pig industry. To identify genomic regions and haplotype blocks responsible for meat quality traits in pigs, a genome-wide association study was conducted for five traits including intramuscular fat content, pH at 45 min and 24 h, drip loss within 24 h and water-holding capacity in 231 Yorkshire barrows using illumina porcine 60k SNP chips. The results showed that a total of 344 single nucleotide polymorphisms (SNP) were significantly associated with five meat quality traits (P<1×10-4). Moreover, 323 SNPs were within the reported QTL regions, of which 21 were novel. Also, 158 SNPs fell into the proximal region of meat quality related genes. In addition, 25 haplotype blocks based on 116 SNPs were revealed with SNP combination patterns for five traits. Our study added new SNP information for identification of meat quality traits in pigs and will help elucidate the mechanisms of meat quality in pigs.  相似文献   

8.
In modern pig breeding programs, growth and fatness are vital economic traits that significantly influence porcine production. To identify underlying variants and candidate genes associated with growth and fatness traits, a total of 1 067 genotyped Duroc pigs with de-regressed estimated breeding values(DEBV) records were analyzed in a genome wide association study(GWAS) by using a single marker regression model. In total, 28 potential single nucleotide polymorphisms(SNPs) were associated with these traits of interest. Moreover, VPS4 B, PHLPP1, and some other genes were highlighted as functionally plausible candidate genes that compose the underlying genetic architecture of porcine growth and fatness traits. Our findings contribute to a better understanding of the genetic architectures underlying swine growth and fatness traits that can be potentially used in pig breeding programs.  相似文献   

9.
Domestic pigs are the second most important source of meat world-wide, and the genetic improvement of economic traits, such as meat production, growth, and disease resistance, is a critical point for efficient production in pigs. Through conventional breeding and selection programs in pigs, which are painstakingly slow processes, some economic traits, such as growth and backfat, have been greatly improved over the past several decades. However, the improvement of many polygenetic traits is still very slow and challenging to be improved by conventional breeding strategies. The development of reproductive knowledge and a variety of techniques, including foreign gene transfer strategies, somatic cell nuclear transfer(SCNT) and particularly, recently developed nuclease-mediated genome editing tools, has provided efficient ways to produce genetically modified(GM) pigs for the dramatic improvement of economic traits. In this review, we briefly discuss the progress of genomic markers used in pig breeding program, trace the history of genetic engineering, mainly focusing on the progress of recently developed genome editing tools, and summarize the GM pigs which have been generated to aim at the agricultural purposes. We also discuss the specific challenges facing application of gene engineering in pig breeding, and future prospects.  相似文献   

10.
【背景】基因组选择育种自2001年被MEUWISSEN等提出以来,已广泛应用在奶牛、猪等重要家畜的育种中,并显著加快了其重要经济性状的遗传改良速度。2017年,在全国畜牧总站的组织协调下,在全国生猪遗传改良计划框架内,猪全基因组选择育种平台项目正式启动。【目的】尽管基因组选择在种猪选育中取得了良好的效果,基因分型技术的不断升级也带来了成本的持续下降,但对于我国多数核心育种场依然面临着基因芯片分型个体数量不足、基因组选择实施流程不完善等问题,限制了该技术的大规模推广应用。结合我国生猪育种的实际情况,研究提出了一种“终测选择-早期选择”的“两步走”基因组选择策略。“终测选择”指在终测结束后利用一步法基因组BLUP对后备猪进行遗传评估,当群体中芯片分型个体数量达到一定规模后进行“早期选择”。【方法】以杜洛克、长白和大白三个种猪品种真实的50K基因芯片数据作为基础群体对不同品种分别进行大群模拟,共模拟4个世代,前3个世代作为基础群体,第4个世代作为测试群体,每个个体模拟两个性状（中等遗传力性状和低遗传力性状）,利用猪基因组选择育种平台基于HIBLUP软件计算不同品种、不同性状的育种值,比较一步法基因组BLUP和常规BLUP两种方法的预测准确性。根据测试群个体有无终测成绩对其基因组育种值影响大小来评估早期选择效果。【结果】分析表明在3个品种内中等遗传力性状的终测选择效果和早期选择效果均好于低遗传力性状。一步法基因组BLUP的选择准确性均优于常规BLUP的选择准确性,并且随着测试群中芯片分型个体数量的增加、群体规模的扩大,预测准确性越来越高。一步法基因组BLUP的早期选择效果好于常规BLUP,当群体中芯片数量达到2 000张时就可以开展早期选择,阉割排名后30%的个体,可以保证前1%的优秀个体不会被错误淘汰,并且随着芯片数量的增加、早期选择的效果会越来越好。【结论】基因组选择“两步走”的策略符合我国国情、容易在生猪育种中推广实施。当芯片数量较少时,可以开展“终测选择”,一定程度上提高选择的准确性,提高育种效率;当芯片数量较多时,可以开展“早期选择”,对排名靠后的猪只个体进行早期阉割,增加优秀个体的测定量,增大选择强度、加快遗传进展。“两步走”策略符合我国生猪产业基因组选择育种的实际需求,该策略的实施将有利于推动我国猪基因组选择的应用、加快种猪改良进程。  相似文献   

11.
[目的]为转基因猪生产的整合效率、外源目的基因表达水平、目的基因在猪体内组织特异性表达分布等相关领域的进一步研究奠定基础。[方法]用显微注射法将GFP标记的转基因猪表达载体PM1导入湖北白猪和通湖猪1-细胞、2-细胞胚胎中,胚胎移植妊娠后生产仔猪,取耳或尾组织样提取基因组总DNA,用PCR法检测PM1在猪基因组中的整合情况。[结果]在所有生产的78头仔猪中,有6头猪用PCR检测为转PM1基因阳性猪,这6头猪在3次PCR扩增反应中都得到650 bp目的扩增片段。其他样品没有得到目的扩增片段的为阴性猪。[结论]载体PM1可以用于携带外源基因进行转基因猪生产。  相似文献   

12.
【目的】筛选出影响从江香猪产仔性状的基因调控网络,揭示其繁殖分子机理,为后期开展从江香猪繁殖性能研究及良种选育提供理论依据。【方法】以高产仔家系（平均产仔数≥12头,遗传稳定）和低产仔家系（平均产仔数8～10头,遗传稳定）从江香猪为研究对象,选择初情期不同产仔家系从江香猪卵巢组织各3个,使用Illumina HiSeqTM 2000测序仪进行转录组测序（RNA-Seq）,并对筛选获得的差异表达基因进行GO功能富集分析及KEGG信号通路富集分析,以寻找与从江香猪产仔数相关的基因调控网络。【结果】从高产仔家系和低产仔家系从江香猪卵巢组织中测序获得的纯净序列（Clean reads）均超过5000万条,且有96.00%以上的Clean reads能比对上猪参考基因组。以|log2FC|≥1.0且P<0.01为标准,筛选获得高产仔家系和低产仔家系从江香猪卵巢组织差异表达基因212个,其中上调表达基因138个、下调表达基因74个。采用实时荧光定量PCR对随机选择的10个差异表达基因进行定量分析,发现OSAP、MSMB、FGFBP1、RLN、HAS1和PLBD1基因在高产仔家系从江香猪卵巢中的相对表达量显著高于低产仔家系从江香猪（P<0.05,下同）,而EDG7、PTX3、BSP1和MRO基因在低产仔家系从江香猪卵巢中的相对表达量显著高于高产仔家系从江香猪,与RNA-Seq测序结果一致。212个差异表达基因共富集在48个GO功能条目上,包含分子功能（Molecular function）、生物学过程（Biological process）和细胞组分（Cellular component）;经KEGG信号通路分析发现共有70个差异表达基因注释到特定的代谢信号通路上,其中显著性富集的KEGG信号通路有类固醇生物合成通路（Steroid biosynthesis）、钙信号通路（Calcium signaling pathway）、卵巢类固醇生成通路（Ovarian steroidogenesis）、心肌细胞肾上腺信号通路（Adrenergic signaling in cardiomyocytes）和肥厚型心肌病通路（Hypertrophic cardiomyopathy,HCM）。在卵巢类固醇生成通路上发现SCARB1、STAR、COX2、CYP11A、CYP17A、17βHSD和CYP19A等7个基因与从江香猪的繁殖性能存在密切联系。【结论】从江香猪卵巢类固醇生成通路上的STAR、CYP11A、CYP17A、17βHSD和CYP19A基因与其发情排卵密切相关,于发情期上调表达能促进卵泡发育成熟及类固醇激素合成,通过增加排卵数量而促使从江香猪表现高产,故可作为从江香猪繁殖性状的候选基因。  相似文献   

13.
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   

14.
VRTN基因是影响猪胸椎数的主效基因,其优势等位基因（Q）比劣势等位基因（q）具有多1对肋骨的效应。本文旨在探索VRTN基因在2个长白种猪群中的分子标记辅助选择方法,以期提高配套肉猪的肋骨数。采用PCR方法检测影响胸椎数（肋骨对数）的VRTN基因在温氏集团420头商品肉猪以及2个专门化长白种猪（913头W51系长白,240头W52系长白）群体中的分布情况。通过商品肉猪的效应分析,验证了在终端商品肉猪中QQ型较qq型猪只多近1对肋骨,说明分子标记辅助选择进行基因改良是可行的。试验结果显示：VRTN基因在2个长白群体中的等位基因频率相差不大,有利等位基因频率分别为0.844和0.905。通过基因型与选育性状表型的相关分析,发现W51系长白猪中,优势基因型猪只体长优势明显,对其他选育性状无影响。W52系中,优势等位基因与达100 kg/115 kg日龄估计育种值呈显著负相关,与其他性状无显著相关性。VRTN优势等位基因型的效应与选育目标一致,2个品系均可开展分子标记辅助选择。结合现场实践育种,W51通过种群更新优化,经过半年就实现了优势等位基因频率100%的完全纯化。W52在扩群的同时,经过2年达到基本纯化。  相似文献   

15.
采用金华猪和六白猪为母本,长白猪和巴克夏猪为父本,进行了4种杂交组合(长金、长六、巴金、巴六)猪的繁殖、生长、屠宰、肉质性能的研究。通过选育筛选和性能测定,长金猪在产活仔数(12.51头),平均日增重(510.38 g·d-1),料重比(3.52),瘦肉率(60.27%),背膘厚(27.32 mm),皮厚(3.11 mm),大理石纹(2.85),平均剪切力(15.64 N),粗蛋白(260 mg·g-1)等指标显著优于其他杂交组合。通过4种杂交组合猪的性能测定,筛选出了长金猪作为最佳选育的商品代,为其在养殖场的推广应用提供了科学依据。  相似文献   

16.
选择对仔猪腹泻有显著影响的产肠毒索大肠杆菌（ETEC）F4ac的受体基因MUC13为研究对象,采用PCR-SNaPshot判型与常规育种技术相结合的方法,对544头大白猪核心育种群进行基因判定及基因型与生长、肉质性状相关性的研究．结果表明,大白猪MUC13基因型分布大小为：腹泻易感杂合基因型GA〉腹泻抗性纯合基因型GG〉腹泻易感纯合基因型从,腹泻抗性有利基因G的等位基因频率为0．669,腹泻易感不利基因A的等位基因频率为O．331．3种基因型个体达100kg日龄及其估计育种值（EBV）、达100kg背膘厚及其EBV的大小为：从〉GA〉GG;眼肌面积、肌内脂肪含量和估计瘦肉率的大小为：GG〉GA〉AA,差异不显著（P〉0．05）．可见,在种猪选育上,逐代选择带有G等位基因的个体,建立抗性纯合GG基因型个体的种猪核心群,即可降低仔猪腹泻率,又不影响生长和肉质的性状．  相似文献   

17.
【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   

18.
Birth weight(BW) and days to 100 kg(D100) are important economic traits that are both affected by polygenes. However, the genetic architecture of these quantitative traits is still elusive. Genotyping-by-sequencing(GBS) data containing a large number of single nucleotide polymorphisms(SNPs) have become a powerful tool in genomic analysis. To better understand their complex genetic structure, a total of 600 Yorkshire pigs were sequenced using GBS technology. After quality control, 279 787 SNPs were generated for subsequent genome-wide association study(GWAS). A total of 30 genome-wide SNPs(P1.79 E–07) were identified for D100. Furthermore, a total of 22 and 2 suggestive SNPs(P3.57 E–06) were detected for D100 and BW, respectively. Of these, one locus located on SSC12(position: 46 226 512 bp) were evaluated to affect both BW and D100 in Yorkshire pigs, indicating the pleiotropism in different traits. Considering the function of candidate genes, two genes, NSRP1 and DOCK7, were suggested as the most promising candidate genes involved in growth traits. Thus, use of GBS is able to identify novel variants and potential candidate genes for BW and D100, and provide an opportunity for improving pig growth traits using genomic selection in pigs.  相似文献   

19.
Hair provides thermal regulation for mammals and protects the skin from wounds, bites and ultraviolet (UV) radiation, and is important in adaptation to volatile environments. Pigs in nature are divided into hairy and hairless, which provide a good model for deciphering the molecular mechanisms of hairlessness. We conducted a genomic scan for genetically differentiated regions between hairy and hairless pigs using 60K SNP data, with the aim to better understand the genetic basis for the hairless phenotype in pigs. A total of 38405 SNPs in 498 animals from 36 diverse breeds were used to detect genomic signatures for pig hairlessness by estimating between-population (FST) values. Seven diversifying signatures between Yucatan hairless pig and hairy pigs were identified on pig chromosomes (SSC) 1, 3, 7, 8, 10, 11 and 16, and the biological functions of two notable genes, RGS17 and RB1, were revealed. When Mexican hairless pigs were contrasted with hairypigs, strong signatures were detected on SSC1 and SSC10, which harbor two functionally plausible genes, REV3L and BAMBI. KEGG pathway analysis showed a subset of overrepresented genes involved in the T cell receptor signaling pathway, MAPK signaling pathway and the tight junction pathways. All of these pathways may be important in local adaptability of hairless pigs. The potential mechanisms underlying the hairless phenotype in pigs are reported for the first time. RB1 and BAMBI are interesting candidate genes for the hairless phenotype in Yucatan hairless and Mexico hairless pigs, respectively. RGS17, REV3L, ICOS and RASGRP1 as well as other genes involved in the MAPK and T cell receptor signaling pathways may be important in environmental adaption by improved tolerance to UV damage in hairless pigs. These findings improve our understanding of the genetic basis for inherited hairlessness in pigs.  相似文献   

20.
肉质性状与胴体性状间的相关分析   总被引：14，自引：0，他引：14  
选取长白、约克、荣昌猪和约长猪等 4个代表性品种和组合的猪只 6 7头 ,收集其屠宰后的肉质性状和胴体性状测定结果。分析肉质性状间、胴体性状间及肉质性状和胴体性状间的相关性 ,结果表明肉质性状间普遍存在一定程度的表型相关 ,尤其以失水率和贮藏损失间的相关系数最高 (r=0 6 4 4 2 ;Pr =0 0 0 0 1)。胴体性状间也存在较高的表型相关 ,以眼肌面积和瘦肉率间的相关系数最高 (r =0 8810 ;Pr =0 0 0 0 1)。而且 ,肉质性状与胴体性状间在总体上存在中等偏低的颉颃关系  相似文献   

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