Volume 13, Issue 3 pp. 192-202
Research Article
Full Access

Molecular, cytogenetic, and phenotypic studies of a constitutional reciprocal translocation t(5; I0)(q22; q25) responsible for familial adenomatous polyposis in a Dutch pedigree

Rob B. Van Der Luijt

Corresponding Author

Rob B. Van Der Luijt

MGC-Department of Human Genetics, Sylvius Laboratory, Leiden University, Leiden, The Netherlands

MGC-Department of Human Genetics, Sylvius Laboratory, Leiden University, Wassenaarseweg 72, 2333 AL Leiden, The NetherlandsSearch for more papers by this author
Carli M. J. Tops

Carli M. J. Tops

MGC-Department of Human Genetics, Sylvius Laboratory, Leiden University, Leiden, The Netherlands

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P. Meera Khan

P. Meera Khan

MGC-Department of Human Genetics, Sylvius Laboratory, Leiden University, Leiden, The Netherlands

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Heleen M. Van Der Klift

Heleen M. Van Der Klift

MGC-Department of Human Genetics, Sylvius Laboratory, Leiden University, Leiden, The Netherlands

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Cor Breukel

Cor Breukel

MGC-Department of Human Genetics, Sylvius Laboratory, Leiden University, Leiden, The Netherlands

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Inge S. J. Van Leeuwen-Cornelisse

Inge S. J. Van Leeuwen-Cornelisse

The Netherlands Foundation for the Detection of Hereditary Tumors, Leiden, The Netherlands

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Hans G. Dauwerse

Hans G. Dauwerse

Department of Clinical Cytogenetics, Leiden University Hospital, Leiden, The Netherlands

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Geoffrey C. Beverstock

Geoffrey C. Beverstock

Department of Clinical Cytogenetics, Leiden University Hospital, Leiden, The Netherlands

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Ellen Van Noort

Ellen Van Noort

Department of Clinical Cytogenetics, Leiden University Hospital, Leiden, The Netherlands

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Pleun Snel

Pleun Snel

Department of Gastroenterology, Slotervaart Hospital, Amsterdam, The Netherlands

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Frederik J. M. Slors

Frederik J. M. Slors

Department of Surgery, Academic Medical Center, Amsterdam, The Netherlands

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Hans F. A. Vasen

Hans F. A. Vasen

The Netherlands Foundation for the Detection of Hereditary Tumors, Leiden, The Netherlands

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Riccardo Fodde

Riccardo Fodde

MGC-Department of Human Genetics, Sylvius Laboratory, Leiden University, Leiden, The Netherlands

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First published: July 1995
Citations: 15

Abstract

Familial adenomatous polyposis (FAP) is an inherited predisposition to colorectal cancer caused by germline mutations in the adenomatous polyposis coli (APC) gene located on chromosome segment 5q21-q22. We detected a germline rearrangement of the APC gene in a Dutch FAP family by screening genomic DNA samples with APC cDNA probes. Subsequent molecular and cytogenetic studies revealed a constitutional reciprocal translocation t(5; 10) (q22; q25) that resulted in the disruption of the APC gene. Southern blot and polymorphic marker analysis indicated that part of the APC gene had been deleted. Analysis of the APC protein product indicated that the translocation breakpoint did not lead t o the formation of a detectable truncated APC protein but apparently resulted in a null allele. Evaluation of the clinical phenotypes in the patients suggested that they exhibited features of an unusual form of FAP characterized by a slightly delayed age of onset of colorectal cancer and a reduced number of colorectal polyps. The latter were mainly sessile and were located predominantly in the proximal colon. To our knowledge, this is the first description of FAP caused by a reciprocal translocation disrupting the APC gene. © 1995 Wiley-Liss, Inc.

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