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Gonadal mosaicism and familial adenomatous polyposis

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Abstract

De novo mutations in the adenomatous polyposis coli (APC) gene are estimated to constitute approximately 25% of familial adenomatous polyposis (FAP) cases. A small percentage of these arise in the mosaic form, affecting only a subset of cells in the affected individual. A family is described here whereby an unaffected mother with no detectible mutation in APC, transmitted the identical APC c.4729G>T (p.Glu1577X) mutation to two children. A third child, with the same APC allelic haplotype received a normal APC allele, suggesting that the mutation originated in the gonadal tissues of the mother. These results underscore the utility of mutation-specific genetic testing for the parents and siblings of a proband of an adult-onset disease, even if the proband appears to have a de novo mutation. Parents who test negative for the mutation should be counseled about the possibility of having another affected child due to gonadal mosaicism.

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Abbreviations

Familial adenomatous polyposis:

FAP

Adenomatous polyposis coli:

APC

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Acknowledgements

We greatly appreciate the diagnostic skills and far-reaching intuition of Dr. Mark Peterson D.D.S, who first recognized osteomas and cysts in the family and referred them for further medical attention. We also acknowledge Jared Cox for family history data evaluation and pedigree construction. This research is supported by NCI grants P01-CA073992 (RWB) and R01-CA040641(RWB).

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Correspondence to Thérèse M. F. Tuohy.

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Schwab, A.L., Tuohy, T.M.F., Condie, M. et al. Gonadal mosaicism and familial adenomatous polyposis. Familial Cancer 7, 173–177 (2008). https://doi.org/10.1007/s10689-007-9169-1

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  • DOI: https://doi.org/10.1007/s10689-007-9169-1

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