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性状牛MyoD基因家族多态性与其和肉质性状关联性

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摘要:英文中的“beef”指的是牛肉,其来源可以分为肉牛、奶牛、阉牛、断奶公牛、或是淘汰母牛,是中东地区(包括巴基斯坦和阿富汗)、澳大利亚、美国、巴西,阿根廷,和欧洲等首要的肉制品来源,并且在东亚部分地区和非洲也占据着相当重要的地位。牛肉占据世界范围内四分之一的肉制品来源,是世界上第三大普遍食用的肉源,仅次于猪肉(38%)和禽肉(30%)制品。有数字表明,美国,巴西和中国是世界上三大牛肉生产国。2011年人均统计,阿根廷人均年消费牛肉67.6kg,美国43.2kg,然而欧盟只有17.9kg。世界牛肉出口大国分别是巴西,澳大利亚和美国。近几年来,随着中国人民生活水平的提升和膳食结构的改善,全社会对牛肉的需求不断增加,对牛肉品质要求更高。目前,牛肉品质是制约中国肉牛业进展的主要不足之一。由此,利用现代分子生物学技术,例如DNA分子标记等来快速、准确地提升中国本地黄牛产肉量和牛肉品质非常重要。MyoD家族基因编码骨骼肌特异性转录因子,有高保守区的螺旋-环-螺旋结构,是影响牛肉品质和产量性状的关键基因,已经被认定为影响肉质性状的候选基因。本探讨选取秦川牛、夏南牛、南阳牛、延边牛、郏县红牛和鲁西牛等6个群体为探讨对象,运用PCR-SSCP技术和测序技术系统地寻找MyoD家族四个基因Myf3,Myf4,Myf5和Myf6的多态位点(SNP),以及对这些SNP与肉质性状的相关性浅析。首先,SNP位点经由PCR和测序技术检测,然后通过SSCP技术浅析整个群体的分布情况。本探讨最后总共筛选到六个SNPs,分别是Myf3(166CG), Myf4(959AG),Myf5(1553AC和1142AG)和Myf6(131TG和232AC),其中Myf3(166CG)为错义突变。关联浅析结果表明,Myf5(1142AG)和Myf6(131TG)两种突变类型与肌内脂肪含量,大理石花纹,系水力,眼肌面积和嫩度有显著相关(P0.05)。此外,Myf4基因的959AG突变与肉的嫩度和系水力呈现极显著相关(P0.01)。六个多态位点在六个牛品种的等位基因和基因型频率有着显著差别,经卡方检验,结果所有SNP位点基因型分布属于中度多态(0.25PIC 0.5)。探讨结果显示,1142AG,959A G和131TG在上面陈述的试验群体中对肉质有潜在的影响,可以用作分子标记。同时,此探讨结果也能够为肉牛的选育工作提供一定的论述依据。关键词:关联浅析论文牛论文MyoD基因家族论文肉质性状论文SNP论文

    摘要7-8

    ABSTRACT8-13

    CHAPTER 1 REVIEW OF LITERATURE13-59

    1.1 Purpose and significance of the research13-14

    1.2 Introduction of meat14-19

    1.2.1 History14-15

    1.2.2 Genetics15

    1.2.3 Environment15-16

    1.2.4 Nutrition16

    1.2.5 Human intervention16

    1.2.6 Biochemical composition16-17

    1.2.7 Main constituents17

    1.2.8 Red and white meat17

    1.2.9 Meat nutritional information17-18

    1.2.10 Production18

    1.2.11 Transport18

    1.2.12 Slaughter18

    1.2.13 Dressing and cutting18-19

    1.2.14 Conditioning19

    1.2.15 Spoilage and preservation19

    1.4 The latest developments in cattle functional genomics and their apppcation to beefquapty19-25

    1.4.1 ‘Genomics’: definition, history, potential benefits and pmitations20-21

    1.4.2 Potential benefits of genomics21-23

    1.4.3 Limitations of genomics23-25

    1.5 Bovine genome sequencing and apppcations for breeding25-33

    1.5.1 Bovine genome sequence25-27

    1.5.2 Latest knowledge of genetic markers in bovine27-30

    1.5.3 Apppcations of functional genomics30

    1.5.4 Muscle gene expression profile associated with marbpng30-31

    1.5.5 Gene and protein expression associated with tenderness31-32

    1.5.6 Conclusion32-33

    1.6 Overview of China's beef industry development33-42

    1.6.1 The domestic and international beef cattle breeding overview35-36

    1.6.2 Chinese classification of cattle and its advantage36-37

    1.6.3 History of the molecular markers37

    1.6.4 Molecular markers research progress37-39

    1.6.5 SNP39-42

    1.6.6 Principles and characteristics of molecular genetic markers used in the current research42

    1.7 MYOD gene family:42-59

    1.7.1 History42-43

    1.7.2 Discovery, structure and general introduction of MyoD gene family43-45

    1.7.3 MyoD 1 gene45-49

    1.7.4 Myogenin (MyoG)/Myf4 gene49-52

    1.7.5 Myf5 gene52-55

    1.7.6 Myf6 Gene55-59

    CHAPTER NO.2 MATERIALS AND METHODS59-72

    2.1 Materials: experimental animals59-61

    2.2 Experimental methods61

    2.3 DNA extraction and detection61-63

    2.3.1 DNA extraction61-62

    2.3.2 DNA detection62

    2.3.3 Method used in the current research62-63

    2.3.4 Main equipment and reagent63

    2.4 The test method63-72

    2.4.1 PCR amppfication system63-72

    CHAPTER 3 RESULTS AND ANALYSIS72-87

    3.1 Extraction of blood's genomic DNA72

    3.2 MYOD1 gene results and analysis72-74

    3.2.1 SNP Mendipan factor determination (Polymorphic indexes) for different breeds72-74

    3.2.2 SNP marker association74

    3.3 MYOG gene results and analysis74-77

    3.3.1 SNP, Mendepan factor determination (Polymorphic indexes) of different breedsand x2 test74-77

    3.3.2 SNP marker associations77

    3.4 MYF5 gene results and analysis77-82

    3.4.1 SNP, Mendipan factor determination (Polymorphic indexes) of different breeds and x2 test for Bovine MyF5 in Exon2 region77-79

    3.4.2 SNP, Mendipan factor determination (Polymorphic indexes) of different breeds andx2 test at intron 1 region79-81

    3.4.3 Association of the genotypes on meat quapty traits for Bovine MyF5 intron region81-82

    3.5 MYF6 gene results and analysis82-87

    3.5.1 SNP, Mendepan factor determination (Polymorphic indexes) and x2 test82-84

    3.5.2 Association analysis exon2 of MyF6 gene84

    3.5.3 Mendipan factors analysis at exon3 of MyF6 gene84-86

    3.5.4 Association analysis at exon3 of MyF6 gene86-87

    CHAPTER 4 DISCUSSION87-92

    4.1 DISCUSSION87-91

    4.2 Conclusion91-92

    REFERENCES92-107

    SUPPLEMENTS107-109

    ACKNOWLEDGEMENTS109-111

    SELF-INTRODUCTION (ABOUT AUTHOR)111-118

    附件118-124

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