The Tay-Sachs disease prevention program in Australia: Sydney pilot study

Area of Science:

• Medical Genetics
• Population Screening
• Genetic Carrier Status

Background:

• Tay-Sachs disease is a severe genetic disorder prevalent in Ashkenazi Jewish populations.
• Understanding carrier frequency is crucial for genetic counseling and reproductive planning.
• Previous studies have established carrier rates, but community attitudes towards testing vary.

Purpose of the Study:

• To determine the carrier frequency of the Tay-Sachs disease gene (HEXA mutations) in an asymptomatic Ashkenazi Jewish cohort in Sydney.
• To assess community and client preferences for different genetic testing and reporting strategies.
• To inform the development of culturally sensitive and effective screening programs.

Main Methods:

• A pilot survey involving 147 individuals of Ashkenazi Jewish origin who underwent genetic testing for Tay-Sachs disease.
• Consultation with Jewish religious, medical, and community organizations and leaders.
• Analysis of carrier rates and community attitudes towards various testing and reporting methods.

Main Results:

• The frequency of heterozygous carriers for Tay-Sachs disease was found to be 1 in 18.
• The relative frequency of the three major allelic variants matched overseas studies.
• Most participants preferred individual reporting of carrier status, but community representatives expressed reservations, highlighting potential issues with this approach for certain community segments.

Conclusions:

• The observed carrier frequency may be higher than in other countries due to ascertainment bias.
• A testing strategy relying solely on medical referral and individual reporting may not be suitable for the entire at-risk community.
• A modified, more inclusive testing strategy is necessary to address community concerns and ensure effective screening.