畜牧兽医学报 ›› 2026, Vol. 57 ›› Issue (1): 136-145.doi: 10.11843/j.issn.0366-6964.2026.01.012

• 遗传育种 • 上一篇    下一篇

影响苏淮猪粗纤维表观消化率的宿主基因挖掘

许黎明1(), 张聪1, 温墩1, 饶肇玺2, 郝韵1, 刘俊逸1, 杜陶然1, 王文强3, 李强4, 李平华1,3(), 黄瑞华1,3()   

  1. 1.南京农业大学养猪研究所(农业农村部遗传资源(猪)评价与利用重点实验室(南京)),南京 210095
    2.南京农业大学生命科学学院,南京 210095
    3.南京农业大学淮安研究院,淮安 223005
    4.淮安市淮阴新淮种猪场,淮安 223322
  • 收稿日期:2025-06-09 出版日期:2026-01-23 发布日期:2026-01-26
  • 通讯作者: 李平华,黄瑞华 E-mail:2022205006@stu.njau.edu.cn;lipinghua718@njau.edu.cn;rhhuang@njau.edu.cn
  • 作者简介:许黎明,博士生,主要从事猪肠道健康与遗传育种研究,E-mail:2022205006@stu.njau.edu.cn
  • 基金资助:
    江苏省农业科学自主创新资金项目(CX(20)1003);国家重点研发计划(2021YFD13011503)

Mining of Host Gene Loci Affecting the Apparent Digestibility of Crude Fiber in Suhuai Pigs

XU Liming1(), ZHANG Cong1, WEN Dun1, RAO Zhaoxi2, HAO Yun1, LIU Junyi1, DU Taoran1, WANG Wenqiang3, LI Qiang4, LI Pinghua1,3(), HUANG Ruihua1,3()   

  1. 1.Institute of Swine Science,Nanjing Agricultural University(Key Laboratory of Pig Genetic Resources Evaluation and Utilization of Ministry of Agriculture and Rural Affairs(Nanjing)),Nanjing 210095,China
    2.College of Life Sciences,Nanjing Agricultural University,Nanjing 210095,China
    3.Huaian Academy of Nanjing Agricultural University,Huaian 223005,China
    4.Huaiyin Xinhuai Pig Breeding Farm of Huai’an City,Huaian 223322,China
  • Received:2025-06-09 Online:2026-01-23 Published:2026-01-26
  • Contact: LI Pinghua, HUANG Ruihua E-mail:2022205006@stu.njau.edu.cn;lipinghua718@njau.edu.cn;rhhuang@njau.edu.cn

摘要:

旨在挖掘影响苏淮猪(25%淮猪血统和75%大白猪血统)粗纤维表观消化率的功能候选基因,为解析猪粗纤维表观消化率的遗传机制奠定基础。本研究选取320头160日龄苏淮猪作为试验对象,通过测定饲料与粪便的粗纤维含量计算表观消化率。同时采集耳组织样品进行80K单核苷酸多态性(single nucleotide polymorphism,SNP)芯片分型,经质控后保留51 625个SNPs,基于芯片数据计算遗传力,并将芯片数据填充至重测序水平。随后基于填充数据开展全基因组关联分析(genome-wide association study,GWAS),并利用贝叶斯精细定位方法进行深入分析。结果表明,该群体粗纤维表观消化率为54.30%±1.03%,变异系数为33.87%,表型变异较大,具有一定的选育空间。遗传力计算结果为0.268±0.106(P=0.012),属于中等遗传力性状。GWAS分析在4号、5号和9号染色体上鉴别到359个与粗纤维表观消化率显著相关的SNPs(P<3.30×10-6)。贝叶斯精细定位确定了3个数量性状基因座(quantitative trait locus,QTL)区间,分别位于4号染色体11.48~12.75 Mb、5号染色体83.39~84.86 Mb和9号染色体18.81~19.68 Mb,经与Pig QTL数据库比对,均为新发现的影响猪粗纤维表观消化率的QTL。进一步通过数据库与文献检索确定了6个功能候选基因MYCANO4、NR1H4、ACTR6、SCYL2和DLG2。利用FarmGTEx项目的PigBiobank数据库对候选基因进行 PheWAS分析,发现这些基因与猪的日增重、肉色及健康等性状显著相关。本研究新发现了3个影响猪粗纤维消化的QTL以及6个功能候选基因,为纤维表观消化率性状的遗传分子机制研究和分子育种提供了前期基础。

关键词: 猪, 粗纤维表观消化率, 基因, QTL

Abstract:

In this study, the objective of this study was to explore the functional candidate genes affecting the apparent digestibility of crude fiber in Suhuai pigs (25% of Suhuai pigs and 75% of Large White pigs), so as to lay the foundation for the analysis of the genetic mechanism of the apparent digestibility of crude fiber in pigs. A total of 320 160-day-old Sohuai pigs were selected for the study, and the apparent digestibility was calculated by measuring the crude fiber content of feed and feces. At the same time, ear tissue samples were collected for 80K single nucleotide polymorphism (SNP) microarray typing, and 51 625 SNPs were retained after quality control, based on which the heritability was calculated and the microarray data were populated to the resequencing level. Subsequently, genome-wide association study (GWAS) was conducted based on the populated data, and Bayesian fine-tuning method was used for in-depth analysis. The results showed that the apparent digestibility of crude fiber in this population was 54.30%±1.03%, and the coefficient of variation was 33.87%, which showed a large phenotypic variation and certain space for selection and breeding. The heritability was calculated as 0.268±0.106 (P=0.012), which is a medium heritability trait. GWAS (genome-wide association study) analysis identified 359 SNPs on chromosomes 4, 5, and 9 that were significantly associated with crude fiber apparent digestibility (P<3.30×10-6). Three quantitative trait loci (QTL) region were identified by Bayesian fine localization on chromosome 4 (11.48-12.75 Mb), chromosome 5 (83.39-84.86 Mb), and chromosome 9 (18.81-19.68 Mb). After comparison with the Pig QTL database, all of them were newly discovered QTL affecting the apparent digestibility of crude fiber in pigs. Six new functional candidate genes, MYCANO4, NR1H4ACTR6, SCYL2 and DLG2 were identified through database and literature search, and PheWAS analysis of the candidate genes using the PigBiobank database of the FarmGTEx project showed that these genes were associated with daily weight gain, meat color and health of pigs. PheWAS analysis using the PigBiobank database of the FarmGTEx program revealed that these genes were significantly associated with the traits of daily weight gain, meat color and health. In this study, 3 QTLs and 6 functional candidate genes affecting crude fiber digestion in pigs were newly identified, which can be used as a reference for the study of genetic molecular mechanism and the implementation of molecular breeding for the trait of apparent digestibility of fiber.

Key words: pig, crude fiber apparent digestibility, gene, quantitative trait loci

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