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SCA2 predictive testing in Cuba: challenging concepts and protocol evolution.

Tania Cruz-Mariño¹, Yaimeé Vázquez-Mojena, Luis Velázquez-Pérez

¹Predictive Genetics Department, Center for the Research and Rehabilitation of Hereditary Ataxias, Holguín, Cuba, taniacruz@hotmail.ca.

Journal of Community Genetics

|April 21, 2015

Summary

This summary is machine-generated.

Cuba

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Area of Science:

Neurogenetics
Neurodegenerative Diseases
Clinical Genetics

Background:

Spinocerebellar ataxia type 2 (SCA2) is a neurodegenerative disorder caused by ATXN2 gene CAG repeat expansion.
Cuba exhibits the world's highest SCA2 prevalence, necessitating robust predictive testing programs.

Purpose of the Study:

To analyze the outcomes and ethical challenges of Cuba's pioneering SCA2 predictive testing program.
To inform modifications in genetic testing protocols for late-onset neurodegenerative disorders.

Main Methods:

Retrospective analysis of medical records from 1193 individuals undergoing SCA2 predictive testing over 13 years.
Evaluation of presymptomatic and prenatal test uptake rates and associated ethical considerations.

Main Results:

Presymptomatic and prenatal test uptake rates were 43.4% and 23.9%, respectively.
Ethical challenges included protocol length, adolescent participation, and decisions regarding affected fetuses.
High frequency of large normal ATXN2 alleles (23-31 repeats) presented unique issues.

Conclusions:

The Cuban SCA2 predictive testing program adapted its guidelines to address ethical challenges and improve accessibility.
Community-level genetic counseling and health education are crucial for successful predictive testing programs.
Lessons learned in Cuba offer valuable insights for international efforts in late-onset neurodegenerative disease genetic testing.