Intrafamilial phenotypic variability in four families with Anderson-Fabry disease

Area of Science:

• Genetics
• Rare Diseases
• Metabolic Disorders

Background:

• Anderson-Fabry Disease is a rare genetic disorder.
• It is caused by mutations in the GLA gene, leading to alpha-galactosidase A deficiency.
• This deficiency results in the accumulation of globotriaosylceramide (Gb3) in various tissues.

Observation:

• A clinical history analysis of 16 hemizygous males from four families with Anderson-Fabry Disease was performed.
• Seven patients died (ages 26-61), while nine are alive (ages 23-55).
• Eleven patients received enzyme replacement therapy (ERT) for 5-10 years.

Findings:

• A wide spectrum of intrafamilial phenotypic variability was observed.
• Variability was noted in terms of target organ involvement and disease severity among family members with the same mutation.
• These findings confirm significant intrafamilial heterogeneity in Anderson-Fabry Disease.

Implications:

• The study highlights the challenge of providing accurate prognostic information during genetic counseling for Anderson-Fabry Disease.
• Prognosis based solely on family history is difficult due to the unpredictable disease course and variable organ involvement.
• Further research is needed to identify factors influencing phenotypic variability and improve patient counseling.