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Haplotype Study in Argentinean Variegate Porphyria Patients.

BACKGROUND/AIMS: The porphyrias are genetically heterogeneous diseases, and each mutation is exclusive to one or two families. Among the mutations responsible for variegate porphyria in our country, c.1042_1043insT stands out, since it was described only in Argentina and is present in about 40% of genetically diagnosed families. Thus, we hypothesized the possible existence of a common ancestor for the mutation in our population.

METHODS: We conducted a study based on microsatellite (short tandem repeats) haplotypes.

RESULTS: We found a common haplotype in all of the patients carrying the common mutation. The age of the mutation was estimated to be about 375 years.

CONCLUSION: There is a recent founder effect in our population for this particular genetic alteration in variegate porphyria.

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