The 12 base pair duplication/insertion alteration could be a regulatory mutation.

Abstract excerpt

A wide array of mutations now numbering more than 200 have been identified in the BRCA1 gene, one of the two breast cancer susceptibility genes identified so far. In addition, there have been several variants described but it is not known if they really represent functionally significant mutations of the BRCA1 gene. We report evidence to show that the duplication/ insertion of 12 base pairs in intron 20 could...

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