| First Author | Kolb AF | Year | 2002 |
| Journal | Biochim Biophys Acta | Volume | 1579 |
| Issue | 2-3 | Pages | 101-16 |
| PubMed ID | 12427545 | Mgi Jnum | J:80463 |
| Mgi Id | MGI:2445898 | Doi | 10.1016/s0167-4781(02)00533-x |
| Citation | Kolb AF (2002) Structure and regulation of the murine gamma-casein gene. Biochim Biophys Acta 1579(2-3):101-16 |
| abstractText | The murine casein locus consists of five genes, which are coordinately regulated during mammary development. The levels of casein-specific mRNAs in mammary epithelial cells increase during the second half of pregnancy and remain high during lactation. The murine gamma-casein gene, which corresponds to the alphaS2-casein gene in ruminants, was isolated from a mouse bacterial artificial chromosome (BAC) library (strain 129SV). The gene contains 14 exons, which are distributed over 14 kb of DNA sequence. The expression pattern of the murine gamma-casein gene mimics that of the neighbouring beta-casein gene in terms of developmental induction in vivo. In cell culture, both the beta- and gamma-casein promoter are synergistically induced by prolactin and glucocorticoids. Glucocorticoid induction is critically dependent on prolactin-mediated activation of STAT5 in both promoters. Several consensus STAT5 binding sites were identified in the gamma-casein promoter, some of which may have an additive effect on prolactin induction. mRNA levels of gamma- and beta-casein are similar in lactating mammary tissue. However, promoter segments derived from the gamma-casein gene are significantly less active in cell culture than comparable fragments of the beta-casein promoter. Promoter hybrids between the gamma- and beta-casein promoters revealed that the critical sequences which are responsible for the different in vitro activity are located in a short promoter proximal region. |
