Krt79, a type II cytokeratin, is a key structural protein. It has been identified as a regulator of hair canal morphogenesis and regeneration in the skin [1]. In the liver, it is a PPARA target, and its expression is highly associated with liver damage, suggesting it could be a diagnostic marker for human liver diseases [1].

In mouse studies, Krt79 expression is undetectable in normal mice but significantly increased by PPARA agonists like WY-14643 and fenofibrate, and completely abolished in Ppara-null mice, indicating PPARA's control over Krt79 [1]. In cashmere goats, multi-omics analysis shows Krt79 has a positive regulatory effect on cashmere fineness [2]. During mammalian skin development, K79+ cells (expressing Krt79) at the distal tips of columns in early hair buds change shape, recede, and undergo cell death to create an orifice for hair emergence, and defects in this process may lead to hair-related pathologies [3].

In conclusion, Krt79 is involved in multiple biological processes, such as hair canal formation in skin development and potentially in liver disease development. Mouse models, especially those with Ppara-null background, have been crucial in revealing its role in the liver. Its role in cashmere fineness regulation also provides new insights into animal fiber development. These findings contribute to our understanding of related biological processes and potential disease mechanisms.