{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent findings in mammary epithelial biology have highlighted the central role of Wnt signaling and beta‐catenin in regulating cell fate. In a mouse model, deletion of exon 3 from the endogenous beta‐catenin gene results in a constitutively active form that drives transdifferentiation of the mammary alveolar epithelium into squamous metaplasias. This perturbation disrupts normal differentiation and shifts the expression profile of multiple gene groups, thereby unmasking several previously uncharacterized gene products."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAmong the genes activated during this transdifferentiation process, a novel small 20 kDa protein—referred to in related reports as SMIM33 (also known as PANE1)—has been identified. This protein exhibits dynamic subcellular localization; it is predominantly nuclear in nonconfluent cells and relocates to the cytoplasm in confluent or actively dividing cells. This behavior suggests that SMIM33 may act as a contextual modulator, integrating cues from the aberrant Wnt/beta‐catenin pathway to influence cell cycle status and differentiation decisions."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFurthermore, the stabilization of beta‐catenin—and the concomitant induction of SMIM33—appears to be associated with the retention of differentiated epithelium during involution, along with altered protease activity within transdifferentiated tissue. This observation implies that SMIM33 might play a regulatory role in tissue remodeling by modulating proteolytic mechanisms and ensuring that the balance between differentiation and proliferation is appropriately maintained during the transition between cellular phenotypes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Jean-Pierre Renou, Brian Bierie, Keiko Miyoshi, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Identification of genes differentially expressed in mouse mammary epithelium transformed by an activated beta-catenin."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Oncogene (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/sj.onc.1206596"}], "href": "https://doi.org/10.1038/sj.onc.1206596"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12881717"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12881717"}]}]}]}