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Published in: BMC Cancer 1/2012

Open Access 01-12-2012 | Research article

Li-Fraumeni-like syndrome associated with a large BRCA1 intragenic deletion

Authors: Amanda Gonçalves Silva, Ingrid Petroni Ewald, Marina Sapienza, Manuela Pinheiro, Ana Peixoto, Amanda França de Nóbrega, Dirce M Carraro, Manuel R Teixeira, Patricia Ashton-Prolla, Maria Isabel W Achatz, Carla Rosenberg, Ana C V Krepischi

Published in: BMC Cancer | Issue 1/2012

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Abstract

Background

Li-Fraumeni (LFS) and Li-Fraumeni-like (LFL) syndromes are associated to germline TP53 mutations, and are characterized by the development of central nervous system tumors, sarcomas, adrenocortical carcinomas, and other early-onset tumors. Due to the high frequency of breast cancer in LFS/LFL families, these syndromes clinically overlap with hereditary breast cancer (HBC). Germline point mutations in BRCA1, BRCA2, and TP53 genes are associated with high risk of breast cancer. Large rearrangements involving these genes are also implicated in the HBC phenotype.

Methods

We have screened DNA copy number changes by MLPA on BRCA1, BRCA2, and TP53 genes in 23 breast cancer patients with a clinical diagnosis consistent with LFS/LFL; most of these families also met the clinical criteria for other HBC syndromes.

Results

We found no DNA copy number alterations in the BRCA2 and TP53 genes, but we detected in one patient a 36.4 Kb BRCA1 microdeletion, confirmed and further mapped by array-CGH, encompassing exons 9–19. Breakpoints sequencing analysis suggests that this rearrangement was mediated by flanking Alu sequences.

Conclusion

This is the first description of a germline intragenic BRCA1 deletion in a breast cancer patient with a family history consistent with both LFL and HBC syndromes. Our results show that large rearrangements in these known cancer predisposition genes occur, but are not a frequent cause of cancer susceptibility.
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Metadata
Title
Li-Fraumeni-like syndrome associated with a large BRCA1 intragenic deletion
Authors
Amanda Gonçalves Silva
Ingrid Petroni Ewald
Marina Sapienza
Manuela Pinheiro
Ana Peixoto
Amanda França de Nóbrega
Dirce M Carraro
Manuel R Teixeira
Patricia Ashton-Prolla
Maria Isabel W Achatz
Carla Rosenberg
Ana C V Krepischi
Publication date
01-12-2012
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2012
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-12-237

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