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The highly prevalent BRCA2 mutation c.2808_2811del (3036delACAA) is located in a mutational hotspot and has multiple origins

AuthorsInfante, Mar ; Durán, Mercedes ; Acedo, Alberto ; Sánchez-Tapia, E. M.; Díez-Gómez, Beatriz; Hoya, Miguel de la; Esteban Cardeñosa, Eva ; Díez, Orland; Osorio, Ana; Lastra, Enrique; González-Sarmiento, Rogelio ; Miner, Cristina ; Velasco, Eladio
Issue Date2013
PublisherOxford University Press
CitationCarcinogenesis 34(11): 2505-2511 (2013)
AbstractBRCA2-c.2808_2811del (3036delACAA) is one of the most reported germline mutations in non-Ashkenazi breast cancer patients. We investigated its genetic origin in 51 Spanish carrier families that were genotyped with eleven 13q polymorphic markers. Three independent associated haplotypes were clearly distinguished accounting for 23 (WCL), 20 (ECL) and 6 families (SoS). Mutation age was estimated with the DMLE software in a range of 45-68 and 45-71 generations for WCL and ECL haplotypes, respectively. The most prevalent variants, c.2808_2811del and c.2803G>A, were located in a double-hairpin loop structure (c.2794-c.2825) predicted by Quikfold that was proposed as a mutational hotspot. To check this hypothesis, random mutagenesis was performed over a 923-bp fragment of BRCA2 and 86 DNA variants were characterized. Interestingly, three mutations reported in the mutation databases (c.2680G>A, c.2944del and c.2957dup) were replicated and 20 affected the same position with different nucleotide changes. Moreover, five variants were placed in the same hairpin-loop of c.2808_2811del, and one affected the same position (c.2808A>G). In conclusion, our results support that at least three different mutational events occurred to generate c.2808_2811del. Other highly prevalent DNA variants, such as BRCA1-c.68_69delAG and BRCA2-c.5946delT and c.8537delAG, are concentrated in hairpin-loops suggesting that these structures may represent mutational hotspots.
DescriptionSupplementary Tables S1–S3 and figures S1 and S2 can be found at: http://carcin.oxfordjournals.org/.-- et al.
Publisher version (URL)http://dx.doi.org/10.1093/carcin/bgt272
Identifiersdoi: 10.1093/carcin/bgt272
issn: 0143-3334
e-issn: 1460-2180
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