Introgression contributes to distribution of structural variations in cattle

Area of Science:

• Genomics
• Animal Genetics

Background:

• Structural variations (SVs) contribute significantly to phenotypic diversity in cattle breeds.
• Understanding SVs is crucial for cattle breeding and genetic improvement.

Purpose of the Study:

• To identify and characterize structural variations (SVs) in taurine and zebu cattle genomes.
• To compare identified SVs with existing databases and investigate novel findings.

Main Methods:

• Whole genome sequencing of 72 cattle individuals (taurine and zebu).
• Application of multiple computational approaches for SV identification.
• Comparison of identified SVs against the Database of Genomic Variants.

Main Results:

• Identification of 16,738 SVs, with 1575 being novel.
• Discovery of a novel GALNT15 gene duplication exclusively in N'Dama cattle.
• Observation of a zebu-associated navel length duplication in N'Dama cattle.
• Identification of a novel deletion upstream of CAST13 in Italian cattle and zebu, indicating introgression.

Conclusions:

• SVs play a critical role in shaping cattle genetic diversity.
• Demographic factors and gene flow significantly influence SV distribution in cattle populations.
• Novel SVs identified offer insights into breed-specific adaptations and evolutionary history.