title: Implication of snoRNA U50 in human breast cancer.
abstract: Deletion of chromosome 6q is frequent in breast cancer, and the deletion often involves a region in 6q14-q16. At present, however, the underlying tumor suppressor gene has not been established. Based on a recent study identifying snoRNA U50 as a candidate for the 6q14-16 tumor suppressor gene in prostate cancer, we investigated whether U50 is also involved in breast cancer. PCR-based approaches showed that U50 underwent frequent genomic deletion and transcriptional downregulation in cell lines derived from breast cancer. Mutation screening identified the same 2-bp deletion of U50 as in prostate cancer in both cell lines and primary tumors from breast cancer, and the deletion was both somatic and in germline. Genotyping of a cohort of breast cancer cases and controls for the mutation demonstrated that, while homozygous genotype of the mutation was rare, its heterozygous genotype occurred more frequently in women with breast cancer. Functionally, re-expression of U50 resulted in the inhibition of colony formation in breast cancer cell lines. These results suggest that noncoding snoRNA U50 plays a role in the development and/or progression of breast cancer.
authors.affiliation: Department of Hematology and Medical Oncology and Winship Cancer Institute, Emory University School of Medicine, 1365 Clifton Road, Atlanta, Georgia 30322, USA.
authors.forename: Xue-Yuan
authors.initials: XY
authors.lastname: Dong
authors.forename: Peng
authors.initials: P
authors.lastname: Guo
authors.forename: Jeff
authors.initials: J
authors.lastname: Boyd
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Sun
authors.forename: Qunna
authors.initials: Q
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.forename: Jin-Tang
authors.initials: JT
authors.lastname: Dong
mesh_terms: D000483:Alleles; D001483:Base Sequence; D001943:Breast Neoplasms / Q000235:genetics*; D002478:Cells, Cultured; D015536:Down-Regulation; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D015894:Genome, Human; D006801:Humans; D009154:Mutation; D020537:RNA, Small Nucleolar / Q000235:genetics*; D012307:Risk Factors; D014158:Transcription, Genetic
chemical_list: D020537:RNA, Small Nucleolar
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