畜牧兽医学报 ›› 2024, Vol. 55 ›› Issue (8): 3436-3445.doi: 10.11843/j.issn.0366-6964.2024.08.017

• 遗传育种 • 上一篇    下一篇

不同单细胞全基因组扩增体系扩增牛微量血液DNA效果评价

牛一凡1,2(), 李崇阳2, 杨柏高2, 张培培2, 张航2, 冯肖艺2, 曹建华2, 余洲2, 马友记1,*(), 赵学明2,*()   

  1. 1. 甘肃农业大学动物科学技术学院,兰州 730070
    2. 中国农业科学院北京畜牧兽医研究所,北京 100193
  • 收稿日期:2023-12-11 出版日期:2024-08-23 发布日期:2024-08-28
  • 通讯作者: 马友记,赵学明 E-mail:nyf.niuyifan@qq.com;yjma@gsau.edu.cn;zhaoxueming@caas.cn
  • 作者简介:牛一凡(1999-),男,河北邯郸人,硕士生,主要从事动物繁殖研究,E-mail: nyf.niuyifan@qq.com
  • 基金资助:
    国家重点研发计划政府间重点专项(2022YFE0100200);国家自然科学基金国际合作项目(32161143032);农业农村部和财政部资助:现代农业产业技术体系资助(CARS-36);国家家养动物种质资源库、中国农业科学院科技创新工程(ASTIP-IAS06)

Evaluation of the Effect of Different Single Cell Whole Genome Amplification Systems on the Amplification of Bovine Trace Blood DNA

Yifan NIU1,2(), Chongyang LI2, Baigao YANG2, Peipei ZHANG2, Hang ZHANG2, Xiaoyi FENG2, Jianhua CAO2, Zhou YU2, Youji MA1,*(), Xueming ZHAO2,*()   

  1. 1. College of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730070, China
    2. Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
  • Received:2023-12-11 Online:2024-08-23 Published:2024-08-28
  • Contact: Youji MA, Xueming ZHAO E-mail:nyf.niuyifan@qq.com;yjma@gsau.edu.cn;zhaoxueming@caas.cn

摘要:

旨在通过二代测序技术评估不同单细胞全基因组扩增(single cell whole genome amplification, scWGA)体系对牛微量血液基因组DNA的扩增效果,建立微量DNA全基因组扩增体系。本研究分别采用MDA(multiple displacement amplification)和MALBAC(multiple annealing and looping-based amplification cycles)两种scWGA体系对华西牛1 ng血液基因组DNA进行全基因组扩增,随后基于两种体系的扩增产物以及原始未稀释血液DNA构建测序文库,利用DNBSEQ-T7RS测序平台进行全基因组测序(whole genome sequencing,WGS),通过比较扩增产物片段大小、浓度、总质量评估扩增效率,通过分析GC含量、测序覆盖度、基因分型一致率、基因型检出率等评估两种体系的扩增效果。结果显示,MDA体系的扩增产物片段大于MALBAC体系(8 kb vs.0.2~2 kb),产物浓度和总质量显著高于MALBAC体系(P < 0.05)。基于测序数据,1×和5×测序深度下,MDA体系的基因组覆盖度显著高于MALBAC体系(P < 0.05),此外, MDA体系的分型一致率、检出率显著高于MALBAC体系,而等位基因缺失率、假阳性率显著低于MALBAC体系(P < 0.05)。综上,本研究揭示了MDA和MALBAC两种扩增体系基于华西牛1 ng血液基因组DNA扩增的体系特点,为改进现有华西牛胚胎基因组选择中的关键扩增技术提供理论依据,促进华西牛遗传育种进展。

关键词: 全基因组扩增, MDA, MALBAC, 微量DNA扩增体系

Abstract:

The purpose of this paper was to evaluate the amplification effect of different single cell whole genome amplification (scWGA) systems on bovine trace blood genomic DNA by next-generation sequencing, and to establish a trace DNA whole genome amplification system. In this study, the whole genome of 1 ng blood genomic DNA of Huaxi cattle was amplified by MDA (multiple displacement amplification) and MALBAC (multiple annealing and looping-based amplification cycles) scWGA systems, and then the sequencing library was constructed based on the amplification products of the two systems and the original undiluted blood DNA. The whole genome sequencing (WGS) was performed using the DNBSEQ-T7RS sequencing platform. The amplification efficiency was evaluated by comparing the fragment's size, concentration and total mass of the amplified products. The amplification effects of the two systems were evaluated by analyzing GC content, average depth, consistent rate of typing and call rate. The results showed that the fragment of the amplified product in MDA system was larger than that in MALBAC system (8 kb vs.0.2-2 kb), the concentration and total mass of the product were significantly higher than those in MALBAC system (P < 0.05). Based on the sequencing data, the genome coverage of MDA system was significantly higher than that of MALBAC system at 1×and 5×sequencing depth(P < 0.05). In addition, the consistency of typing rate and call rate of MDA system were significantly higher than MALBAC system, while the allele drop rate and false positive rate of MALBAC system were significantly lower than MALBAC system(P < 0.05). In summary, this study revealed that the characteristics of two amplification systems of MDA and MALBAC were based on the DNA amplification of Huaxi cattle 1 ng blood genome, which provided a theoretical basis for improving the key amplification techniques in Huaxi cattle embryo genome selection and promoting the progress of Huaxi cattle genetics and breeding.

Key words: whole genome amplification, MDA, MALBAC, trace DNA amplification system

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