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The parathyroid hormone-responsive B1 gene is interrupted by a t(1;7)(q42;p15) breakpoint associated with Wilms' tumour

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Author(s)

EG Vernon, K Malik, Paul Andrew Reynolds, R Powlesland, AR Dallosso, S Jackson, K Henthorn, ED Green, KW Brown

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Abstract

Wilms' tumour (WT) has a diverse and complex molecular aetiology, with several different loci identified by cytogenetic and molecular analyses. One such locus is on chromosome 7p, where cytogenetic abnormalities and loss of heterozygosity (LOH) indicate the presence of a Wilms' tumour suppressor gene. In order to isolate a candidate gene for this locus, we have characterized the breakpoint regions at a novel constitutional chromosome translocation (t(1;7)(q42;p15)), found in a child with WT and skeletal abnormalities. We identified two genes that were interrupted by the translocation: the parathyroid hormone-responsive B1 gene (PTH-B1) at 7p and obscurin at 1q. With no evidence for LOH at 1q42, we focused on the characterization of PTH-B1. We detected novel alternately spliced isoforms of PTH-B1, which were expressed in a wide range of adult and foetal tissues. Importantly, expression of two isoforms were disrupted in the WT of the t(1;7) patient. We also identified an additional splice isoform expressed only in 7p LOH tumours. The disruption of PTH-B1 by the t(1;7), together with aberrant splicing in sporadic WTs, suggests that PTH-B1 is a candidate for the 7p Wilms' tumour suppressor gene.

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Original languageEnglish
Pages (from-to)1371-1380
Number of pages10
JournalOncogene
Volume22
Issue number9
DOIs
Publication statusPublished - 6 Mar 2003

    Research areas

  • Wilms' tumour, chromosome 7, PTH-B1 gene, SHORT ARM, HETEROZYGOSITY, TRANSLOCATION, CHROMOSOME-7, CELLS, LOCUS, IDENTIFICATION, ABNORMALITIES, MUTATIONS, ALLELES

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