Mutations in exon 3 of the CTNNB1 gene (beta-catenin gene) in cutaneous adnexal tumors.

Abstract

Previous studies suggested that mutant beta-catenin gene cells in cutaneous adnexal tumors with matrical differentiation contribute to their tumorigenesis. Except for pilomatricoma and pilomatrical carcinoma, only a handful of other cutaneous adnexal tumor types have been studied. DNA was extracted from 86 lesions including 17 proliferating tricholemmal and trichilemmal tumors, 15 trichoblastomas, 7 trichoadenomas, 4 pilomatricomas, 1 pilomatrical carcinoma, 4 basal cell carcinomas (BCCs) with shadow cells, 2 trichofolliculomas, 3 BCCs with sebaceous differentiation, 9 sebaceous adenomas, 6 sebaceomas, 14 sebaceous carcinomas (both ocular and extraocular forms), 2 gigantic horns, and 2 apocrine mixed tumors with shadow cells and subjected to polymerase chain reaction with newly designed primers encompassing glycogen synthase kinase-3beta phosphorylation sites of the CTNNB1 gene. Also, 3 craniopharyngiomas were studied. Sequenced polymerase chain reaction products for possible beta-catenin gene mutations showed a total of 8 alterations. These included 5 different point mutations, 3 of them identified in 2 different tumors: S23N (cribriform trichoblastoma), D32Y (pilomatricoma and craniopharyngioma), G34R (pilomatrical carcinoma and craniopharyngioma), S37F (2 BCCs with shadow cell differentiation), and G34V (craniopharyngioma). This study broadens the list of cutaneous adnexal tumors harboring CTNNB1 mutations and extends the listing of the mutations occurring in these neoplasms.

• Authors: Dmitry V Kazakov, Radek Sima, Tomas Vanecek, Heinz Kutzner, Gabriele Palmedo, Denisa Kacerovska, Petr Grossmann, Michal Michal
• Journal: The American Journal of dermatopathology (Am J Dermatopathol) Vol. 31 Issue 3 Pg. 248-55 (May 2009) ISSN: 1533-0311 [Electronic] United States
• PMID: 19384065 (Publication Type: Journal Article)

Chemical References

• CTNNB1 protein, human
• beta Catenin

Topics

• Adolescent
• Adult
• Aged
• Aged, 80 and over
• Base Sequence
• Cell Differentiation
• Child
• Child, Preschool
• Craniopharyngioma (genetics)
• DNA Mutational Analysis
• Exons
• Female
• Gene Expression Regulation, Neoplastic
• Humans
• Male
• Middle Aged
• Molecular Sequence Data
• Mutation
• Neoplasms, Adnexal and Skin Appendage (genetics, pathology)
• Pituitary Neoplasms (genetics)
• Skin Neoplasms (genetics, pathology)
• Young Adult
• beta Catenin (genetics)