Sonstegard Tad S, Flórez Julio M, Garcia José Fernando
Acceligen Inc., Eagan, MN 55121.
Department of Preventive Veterinary Medicine and Animal Reproduction, School of Agricultural and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, 14884-900, Brazil.
JDS Commun. 2024 Sep 2;5(6):767-771. doi: 10.3168/jdsc.2023-0481. eCollection 2024 Nov.
Genome editing is the latest breeding tool capable of accelerating the rate of genetic improvement for health and well-being traits in food animals. It enables the introduction of beneficial alleles within a single generation, including those that are of low frequency or absent in the population, while effectively bypassing linkage drag. For the dairy industry, genome editing can be used to make rapid genetic improvements that are precise, efficient, and transgene-free for functional traits that are not practically addressed without disrupting conventional breeding goals for overall economic merit based on genomic selection. Herein, various case studies for dairy cattle breeding are presented that demonstrate applications of genome editing for enhancing heat stress tolerance, reduced disease susceptibility, and other qualitative traits absent in some breeds. One case highlights the success of simultaneous editing of multiple loci through recent advancements in embryonic stem cell biology. Multiplexed editing is crucial for addressing the polygenic nature inherent to many economically important traits in livestock. However, maximizing the benefits of genome editing depends on the continued discovery of targets for editing that are commercially important. Commercialization also depends on rapidly evolving regulatory statutes for risk assessment, where some countries already permit the commercialization of cattle with non-GMO genome alterations through existing regulations. New breeding technologies such as genome editing are now poised to have significant impact in equipping elite performance cattle to be more resilient to infectious disease and climate change without the loss of production gains obtained from decades of selection.
基因组编辑是最新的育种工具,能够加快食用动物健康和福利性状的遗传改良速度。它能在一代内引入有益等位基因,包括群体中低频或不存在的等位基因,同时有效绕过连锁累赘。对于乳制品行业而言,基因组编辑可用于对功能性状进行快速、精确、高效且无转基因的遗传改良,而这些功能性状若不干扰基于基因组选择的整体经济价值的传统育种目标则难以实际解决。本文介绍了各种奶牛育种的案例研究,展示了基因组编辑在增强耐热性、降低疾病易感性以及改善某些品种中不存在的其他质量性状方面的应用。一个案例突出了通过胚胎干细胞生物学的最新进展同时编辑多个位点所取得的成功。多重编辑对于解决家畜许多经济重要性状所固有的多基因性质至关重要。然而,最大化基因组编辑的益处取决于持续发现具有商业重要性的编辑靶点。商业化还取决于快速演变的风险评估监管法规,一些国家已经通过现有法规允许具有非转基因基因组改变的牛商业化。诸如基因组编辑等新育种技术如今有望在使优质性能的奶牛更能抵御传染病和气候变化且不损失数十年来选择所获得的生产收益方面产生重大影响。