Adenomatosis polyposis coli down-regulated 1 (APCDD1) encodes a membrane bound glycoprotein. Apcdd1 is predominantly expressed in epidermal and dermal compartments of human hair follicles. In human chromosome, the gene APCDD1 is localized on 18p11.22.
Biochem/physiol Actions
Adenomatosis polyposis coli down-regulated 1 (APCDD1) inhibits wnt (wingless/integrated) signalling and promotes human hair growth. Mutations in APCDD1 results in a rare autosomal dominant hereditary hypotrichosis, which is characterized by hair loss due to hair follicle miniaturization. APCDD1 is directly regulated by β-catenin/T-cell factor 4 (TCF4). The high expression of Apcdd1 in colon cancer cells promotes its proliferation. APCDD1 is essential for adipocyte differentiation. Downregulation of APCDD1 in diet induced obesity impairs adipocyte differentiation and causes obesity related metabolic diseases.
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To clarify the molecular mechanisms of human carcinogenesis associated with abnormal beta-catenin/T-cell factor (Tcf) signaling, we have been using cDNA microarrays to search for genes whose expression is significantly altered after introduction of wild-type APC into SW480 colon cancer cells.
Hereditary hypotrichosis simplex is a rare autosomal dominant form of hair loss characterized by hair follicle miniaturization. Using genetic linkage analysis, we mapped a new locus for the disease to chromosome 18p11.22, and identified a mutation (Leu9Arg) in the adenomatosis
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