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The mutation analysis of alpha-galactosidase A gene was carried out in two families with Fabry disease described by us earlier. In the family P. a new point mutation E341K (a G to A transition at position 10,999 of the gene) was identified. The mutation causes a Glu341Lys substitution in alpha-galactosidase A molecule. Another point mutation was identified in a patient from family N. who had unusual unusually high residual activity of alpha-galactosidase A. The mutation was identified as R112C (a C to T transition at position 5233 of alpha-galactosidase A gene) and it caused the Arg112Cys substitution in the enzyme molecule. This mutation was earlier described in Japanese patient with showed a complete loss of enzyme activity. However, in this case the mutation was combined with another mutation Glu66Gln. The relationship between genetic heterogeneity and clinical manifestation of Fabry disease is discussed.