The Genomic Landscape of Cattle: Domestication, Dispersal, and Adaptive Evolution

TL;DR

This review explores how cattle genomes evolved through domestication, migration, and human influence, offering insights for sustainable breeding in a changing climate.

Contribution

The paper synthesizes paleogenomic and population genetic data to reconstruct cattle's evolutionary history and genomic diversity.

Findings

Cattle domestication occurred in two regions: the Fertile Crescent and the Indus Valley.

Genetic introgression and admixture shaped the global dispersal and diversity of cattle.

The bovine pangenome reveals hidden genetic variations important for climate resilience and disease resistance.

Abstract

From the initial domestication of the aurochs in the Fertile Crescent and Indus Valley to the emergence of specialized breeds such as Simmental and Holstein, cattle have coevolved inextricably with humans. This review highlights that modern cattle are not static entities but dynamic genomic mosaics, shaped by ancient migrations, genetic introgression from extinct wild relatives, and continuous adaptation to human demands and environmental challenges. Understanding this complex history through the lens of modern genomics extends far beyond documenting the diversity of the cattle genome; it provides an essential roadmap for molecular breeding and sustainable livestock systems to respond to the challenge of a changing global climate.

Domestic cattle represent one of the most significant evolutionary successes in the history of human–animal mutualism. This review synthesizes evidence from paleogenomics and modern population genetics, particularly recent pangenome analyses, to reconstruct a comprehensive evolutionary trajectory of cattle. We outline the two domestication events: the emergence of taurine cattle (Bos taurus) in the Fertile Crescent (~10,500 years ago) and zebu cattle (Bos indicus) in the Indus Valley (~8000 years ago). Following domestication, cattle dispersed globally alongside human migration, resulting in a complex genetic mosaic shaped by introgression with wild relatives and extensive admixture between lineages. By integrating data from mitochondrial DNA, Y-chromosome haplotypes, and whole-genome sequencing of modern, ancient, and wild samples, we reconstruct the detailed global dispersal of cattle. Furthermore, we dissect the molecular mechanisms underlying phenotypic diversity, emphasizing how natural selection has driven environmental adaptation, how artificial selection has optimized production traits, and how the emerging bovine pangenome is unveiling “hidden” genetic variations critical for climate resilience and disease resistance. Ultimately, this review summarizes the origin, dispersal, and genomic diversity of cattle, offering vital insights for the conservation of indigenous genetic resources and the advancement of molecular breeding strategies in the face of a changing global climate.

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