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Delineation of a 1Mb breakpoint region at 1p13 in Wilms tumors by fine‐tiling oligonucleotide array CGH

Identifieur interne : 002524 ( Istex/Corpus ); précédent : 002523; suivant : 002525

Delineation of a 1Mb breakpoint region at 1p13 in Wilms tumors by fine‐tiling oligonucleotide array CGH

Auteurs : Rachael Natrajan ; Richard D. Williams ; Anita Grigoriadis ; Alan Mackay ; Kerry Fenwick ; Alan Ashworth ; Jeffrey S. Dome ; Paul E. Grundy ; Kathy Pritchard-Jones ; Chris Jones

Source :

RBID : ISTEX:F5CEC1ED5BB14FBB1AA8F7830851736E0F5A8172

Abstract

Wilms tumor karyotypes frequently exhibit recurrent, large‐scale chromosomal imbalances, among the most common of which are concurrent loss of 1p and gain of 1q. We have previously identified a novel breakpoint at 1p13 by 1 Mb‐spaced array CGH, and have now undertaken a fine‐tiling oligonucleotide array approach to map the region accurately in four tumors exhibiting rearrangements at this locus. The use of a 10 bp‐spaced platform revealed that all four tumors in fact harbored different breakpoints, which targeted intragenic sequences in PHTF1, DCLRE1B, and NRAS, and an intergenic region immediately downstream of TRIM33. All four genes and breakpoints were within the 1.78 Mb intervals identified by the genome‐wide BAC arrays. The precise breakpoint interval was in each case mapped to a 200–1,200 bp region and was confirmed for one case to lie within intron 3 of DCLRE1B by quantitative PCR. Analysis of local genome architecture revealed no convincing conservation of repetitive sequences or specific translocation/recombination‐associated elements within the breakpoint regions. This study highlights the power of fine‐tiling oligonucleotide arrays to delineate breakpoint regions identified by genome‐wide screens. © 2007 Wiley‐Liss, Inc.

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DOI: 10.1002/gcc.20446

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ISTEX:F5CEC1ED5BB14FBB1AA8F7830851736E0F5A8172

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<abstract lang="en">Wilms tumor karyotypes frequently exhibit recurrent, large‐scale chromosomal imbalances, among the most common of which are concurrent loss of 1p and gain of 1q. We have previously identified a novel breakpoint at 1p13 by 1 Mb‐spaced array CGH, and have now undertaken a fine‐tiling oligonucleotide array approach to map the region accurately in four tumors exhibiting rearrangements at this locus. The use of a 10 bp‐spaced platform revealed that all four tumors in fact harbored different breakpoints, which targeted intragenic sequences in PHTF1, DCLRE1B, and NRAS, and an intergenic region immediately downstream of TRIM33. All four genes and breakpoints were within the 1.78 Mb intervals identified by the genome‐wide BAC arrays. The precise breakpoint interval was in each case mapped to a 200–1,200 bp region and was confirmed for one case to lie within intron 3 of DCLRE1B by quantitative PCR. Analysis of local genome architecture revealed no convincing conservation of repetitive sequences or specific translocation/recombination‐associated elements within the breakpoint regions. This study highlights the power of fine‐tiling oligonucleotide arrays to delineate breakpoint regions identified by genome‐wide screens. © 2007 Wiley‐Liss, Inc.</abstract>
<note type="funding">Cancer Research UK</note>
<note type="funding">Breakthrough Breast Cancer</note>
<note type="funding">Lisa Thaxter Trust</note>
<relatedItem type="host">
<titleInfo>
<title>Genes, Chromosomes and Cancer</title>
</titleInfo>
<titleInfo type="abbreviated">
<title>Genes Chromosom. Cancer</title>
</titleInfo>
<genre type="journal">journal</genre>
<subject>
<genre>article-category</genre>
<topic>Research Article</topic>
</subject>
<identifier type="ISSN">1045-2257</identifier>
<identifier type="eISSN">1098-2264</identifier>
<identifier type="DOI">10.1002/(ISSN)1098-2264</identifier>
<identifier type="PublisherID">GCC</identifier>
<part>
<date>2007</date>
<detail type="volume">
<caption>vol.</caption>
<number>46</number>
</detail>
<detail type="issue">
<caption>no.</caption>
<number>6</number>
</detail>
<extent unit="pages">
<start>607</start>
<end>615</end>
<total>9</total>
</extent>
</part>
</relatedItem>
<identifier type="istex">F5CEC1ED5BB14FBB1AA8F7830851736E0F5A8172</identifier>
<identifier type="DOI">10.1002/gcc.20446</identifier>
<identifier type="ArticleID">GCC20446</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Copyright © 2007 Wiley‐Liss, Inc.</accessCondition>
<recordInfo>
<recordContentSource>WILEY</recordContentSource>
<recordOrigin>Wiley Subscription Services, Inc., A Wiley Company</recordOrigin>
</recordInfo>
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<serie></serie>
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