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A high frequent BRCA1 founder mutation identified in the Greenlandic population

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Abstract

Approximately 10% of all breast and ovarian cancers are dominantly inherited and mutations are mainly found in the BRCA 1 and 2 genes. The penetrance of BRCA1 mutations is reported to be between 68 and 92% and confers a 36–92% life time risk of breast cancer. Most mutations in BRCA1 are uniquely occurring mutations, but founder mutations have been described. In this study we describe a founder mutation with wide spread presence in the Inuit population. We have screened 2,869 persons from Greenland for the presence of a BRCA1 mutation (p.Cys39Gly) only found in the Inuit population. The overall carrier frequency was 1.6% in the general population, but the frequency differs geographically from 0.6% on the West coast to 9.7% in the previously isolated population of the East coast. This is to our knowledge the highest population frequency of a BRCA1 mutation ever to be described. To determine the clinical relevance of the mutation, we have examined ten breast cancer patients and nine ovarian cancer patients from Greenland for the presence of the p.Cys39Gly mutation. We found three ovarian cancer patients (33%) and one breast cancer patient (10%) carrying the mutation. The high number of women carrying a BRCA1 mutation known to trigger the development of potentially lethal diseases leads us to recommend an offer of genetic counselling and test for the mutation to all females of Inuit origin, thereby hopefully preventing a number of breast and ovarian cancer deaths.

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Acknowledgments

The authors would like to thank Tina Wandall, Gitte Kristensen, Theresa Wass and Karina Thaysen for their excellent laboratory assistance. This study was supported by the following foundations: Olga og Espen Boels Fond, Fabrikant Einar Willumsens Mindelegat, Kong Christian den Tiendens Fond, Civilingenør Bent Bøgh og Hustru Inge Bøgh’s Fond, Victoria og Henry Andersens legat, Meta og Håkon Baggers Fond and Grosserer Valdemar Foerson og Hustru Thyra Foersom, født Ottos Fond and Arvid Nilssons Fond. TLH was generously supported with a senior research scholarship from Fonden af 17-12-1981. This study has been approved by the Danish Research Ethics Committees and The Commission for Scientific Research in Greenland.

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Correspondence to Theresa Larriba Harboe.

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Harboe, T.L., Eiberg, H., Kern, P. et al. A high frequent BRCA1 founder mutation identified in the Greenlandic population. Familial Cancer 8, 413–419 (2009). https://doi.org/10.1007/s10689-009-9257-5

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