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Breast Cancer Research and Treatment

, Volume 145, Issue 2, pp 451–460 | Cite as

Clinical and molecular characterization of the BRCA2 p.Asn3124Ile variant reveals substantial evidence for pathogenic significance

  • Harald Martin Surowy
  • Christian Sutter
  • Max Mittnacht
  • Ruediger Klaes
  • Dieter Schaefer
  • Christina Evers
  • Anna Lena Burgemeister
  • Caroline Goehringer
  • Nicola Dikow
  • Joerg Heil
  • Michael Golatta
  • Sarah Schott
  • Andreas Schneeweiss
  • Peter Bugert
  • Christof Sohn
  • Claus Rainer Bartram
  • Barbara Burwinkel
Epidemiology

Abstract

Variants of uncertain clinical significance (VUS) in the high-penetrance breast cancer susceptibility genes BRCA1 and BRCA2 represent a major obstacle in genetic counseling of high-risk breast cancer families. We analyzed a missense VUS located in BRCA2 (p.Asn3124Ile; HGVS: BRCA2 c.9371A > T) present in seven independent high-risk breast cancer families that were counseled and genetically tested in South-West Germany. The VUS was identified by DNA sequencing. We analyzed co-occurrence with deleterious BRCA1/2 mutations, segregation, evolutionary conservation, in silico impact prediction, and prevalence in the general population. All carriers of the VUS suffered from breast or ovarian cancer. In two families, an additional high burden of other cancers such as pancreatic, prostate, and gastric cancers was reported, one further family included two cases of male breast cancer. The VUS did not co-occur with deleterious BRCA1/2 mutations and segregated in two affected individuals of one family. In contrast to the 7/1,347 (0,5 %) tested high-risk BC families without clearly pathogenic mutations in BRCA1/2, none of 3,126 healthy population controls sharing the same ethnic and geographical background were found to carry this VUS (p = 0.0002). In-silico prediction revealed strong evolutionary conservation of the asparagine residue, residing in the C-terminal oligonucleotide-binding-fold-3 region, and a most likely damaging impact of this exchange on the protein structure. The BRCA2 p.Asn3124Ile (BRCA2 c.9371A > T) variant is a rare mutation with a damaging effect on the BRCA2 protein that is strongly associated with familial breast and ovarian cancer risk, indicating its most likely pathogenic nature and clinical relevance.

Keywords

BRCA2 gene Breast cancer risk Variant of uncertain clinical significance Unclassified variant Familial breast and ovarian cancer 

Abbreviations

VUS

Variant of uncertain clinical significance

BC

Breast cancer

OC

Ovarian cancer

PCC

Pancreatic cancer

PC

Prostate cancer

GC

Gastric cancer

CRC

Colorectal cancer

LC

Lung cancer

ER

Estrogen receptor

PR

Progesterone receptor

HER2

Human epidermal growth factor receptor 2

Notes

Conflict of interest

The authors declare that they have no conflict of interest.

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© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Harald Martin Surowy
    • 1
    • 2
  • Christian Sutter
    • 3
  • Max Mittnacht
    • 1
  • Ruediger Klaes
    • 3
    • 4
  • Dieter Schaefer
    • 5
  • Christina Evers
    • 3
  • Anna Lena Burgemeister
    • 3
  • Caroline Goehringer
    • 3
  • Nicola Dikow
    • 3
  • Joerg Heil
    • 6
  • Michael Golatta
    • 6
  • Sarah Schott
    • 6
  • Andreas Schneeweiss
    • 7
  • Peter Bugert
    • 8
  • Christof Sohn
    • 6
  • Claus Rainer Bartram
    • 3
  • Barbara Burwinkel
    • 1
    • 2
  1. 1.Division Molecular Biology of Breast Cancer, Department of Gynecology and ObstetricsUniversity of HeidelbergHeidelbergGermany
  2. 2.Molecular Epidemiology, C080German Cancer Research Center (DKFZ)HeidelbergGermany
  3. 3.Institute of Human GeneticsUniversity of HeidelbergHeidelbergGermany
  4. 4.Zentrum fuer Humangenetik Mannheim (ZHMA)MannheimGermany
  5. 5.Institute of Human GeneticsUniversity Hospital FrankfurtFrankfurt am MainGermany
  6. 6.Department of Gynecology and ObstetricsUniversity of HeidelbergHeidelbergGermany
  7. 7.Division of Gynecologic Oncology, National Center for Tumor DiseasesUniversity Hospital HeidelbergHeidelbergGermany
  8. 8.Institute of Transfusion Medicine and Immunology, Medical Faculty MannheimUniversity of HeidelbergMannheimGermany

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