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Science 16 November 1990:
Vol. 250. no. 4983, pp. 991 - 994
DOI: 10.1126/science.2173145
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Articles

Science, Vol 250, Issue 4983, 991-994
Copyright © 1990 by American Association for the Advancement of Science

articles

Tissue, developmental, and tumor-specific expression of divergent transcripts in Wilms tumor

A Huang, CE Campbell, L Bonetta, MS McAndrews-Hill, S Chilton-MacNeill, MJ Coppes, DJ Law, AP Feinberg, H Yeger, and BR Williams

Department of Genetics, Hospital for Sick Children, Toronto, Ontario, Canada.

The Wilms tumor locus on chromosome 11p13 has been mapped to a region defined by overlapping, tumor-specific deletions. Complementary DNA clones representing transcripts of 2.5 (WIT-1) and 3.5 kb (WIT-2) mapping to this region were isolated from a kidney complementary DNA library. Expression of WIT-1 and WIT-2 was restricted to kidney and spleen. RNase protection revealed divergent transcription of WIT-1 and WIT-2, originating from a DNA region of less than 600 bp. Both transcripts were present at high concentrations in fetal kidney and at much reduced amounts in 5-year-old and adult kidneys. Eleven of 12 Wilms tumors classified as histopathologically heterogeneous exhibited absent or reduced expression of WIT-2, whereas only 4 of 14 histopathologically homogeneous tumors showed reduced expression. These data demonstrate a molecular basis for the pathogenetic heterogeneity in Wilms tumorigenesis.


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