Regulation of Milk Production by the MAPK/ERK Pathway in Water Buffalo (Bubalus bubalis): Genomic and Molecular Insights.

The MAPK/ERK pathway plays a critical role in the regulation of milk production by controlling cellular processes such as proliferation, differentiation and survival, which are essential for lactogenesis and mammary gland function. Bubalus bubalis (Water buffalo), known for its unique physiological and ecological characteristics, serves as an ideal model to explore the evolutionary and molecular roles of MAPK/ERK pathway genes. This study presents the first comprehensive computational analysis of MAPK/ERK genes in B. bubalis, identifying 21 key genes involved in the pathway. Phylogenetic analysis clustered these genes into 13 distinct clades, such as MST1, GRB2, RAS, ETS1, JUN and FOS, and revealed close evolutionary relationships with Bos taurus and Camelus bactrianus. Structural characterization identified 10 conserved motifs, including essential domains like protein kinase, ETS and RAS, reflecting their functional significance. Gene structure analysis revealed substantial variation in exon-intron patterns, while synteny analysis confirmed collinearity with human orthologs, indicating genomic conservation. Physicochemical analysis highlighted a broad range of molecular weights and isoelectric points, with most proteins classified as hydrophilic and thermostable. Gene duplication and selection analyses revealed seven segmentally duplicated gene pairs, with the JUN-ETS1 and DUSP6-MST1 pairs showing evidence of positive selection, suggesting functional divergence. These findings establish a foundational understanding of MAPK/ERK pathway genes in B. bubalis and provide valuable insights into potential targets for genetic improvement, selective breeding and sustainable dairy management strategies aimed at enhancing milk production and quality.