Fusion of the tumor-suppressor gene CHEK2 and the gene for the regulatory subunit B of protein phosphatase 2 PPP2R2A in childhood teratoma.

Abstract:

:We characterized the molecular genetic consequences of a balanced chromosome translocation t(8;22)(p21;q12), which occurred as the sole cytogenetic aberration in short-term cultured cells from an intrathoracic mature teratoma in a 15-year-old girl. Fluorescence in situ hybridization and reverse transcription-polymerase chain reaction disclosed that t(8;22) resulted in the fusion of the genes PPP2R2A and CHEK2, with an inserted fragment belonging to class I endogenous retrovirus-related sequences at the junction. Sequencing of the two genes did not reveal any additional mutation. None of the three detected PPP2R2A/CHEK2 fusion transcripts resulted in an in-frame PPP2R2A/CHEK2 chimerical open reading frame; however, in all of them, the known open reading frame of CHEK2 was preserved. Thus, promoter swapping leading to deregulated CHEK2 expression would be the most likely oncogenic mechanism. Whereas inactivating mutations of CHEK2 previously have been described in a variety of sporadic tumors and in inherited cancer-predisposing syndromes, PPP2R2A, encoding a regulatory subunit of the multimeric enzyme phosphatase 2, has not been directly implicated in tumorigenesis. Our findings suggest that deregulation of CHEK2 and/or PPP2R2A is of pathogenetic importance in at least a subset of germ cell tumors.

journal_name

Neoplasia

authors

Jin Y,Mertens F,Kullendorff CM,Panagopoulos I

doi

10.1593/neo.06139

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

413-8

issue

5

eissn

1522-8002

issn

1476-5586

journal_volume

8

pub_type

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