Exome-wide comparative analyses revealed differentiating genomic regions for performance traits in Indian native...

Area of Science:

• Animal Genetics
• Genomics
• Livestock Breeding

Background:

• Limited research exists on the performance potential of India's 20 registered buffalo breeds, particularly native ones.
• Understanding genetic diversity is crucial for improving milk yield, composition, fertility, and adaptation in indigenous buffalo populations.

Purpose of the Study:

• To identify important genetic variants and unique genes in Indian local buffalo breeds using whole exome sequencing.
• To explore the genetic basis of milk yield, milk composition, fertility, and adaptation traits in these breeds.

Main Methods:

• Whole exome sequencing was performed on four Indian buffalo breeds: Chhattisgarhi, Chilika, Gojri, and Murrah.
• Analysis included stringent quality control, identification of InDels (insertions/deletions), and exome-wide FST outlier window detection.
• Comparative exome analysis and gene ontology were used to identify breed-specific genes.

Main Results:

• Thousands of InDels were identified across the studied breeds, with significant outlier windows detected.
• Unique breed-specific genes were identified for key economic traits: milk yield (CAMSAP3), milk composition (CLCN1, NUDT3), fertility (PTGER3), and adaptation (KCNA3, TH).

Conclusions:

• The study provides insights into the evolutionary mechanisms and genomic impacts of natural selection on Indian buffalo breeds.
• Identified genetic variants and genes are crucial for maintaining breed purity and have significant implications for future breeding applications and genetic improvement programs.