Genetics and clinical practice in rheumatology

Area of Science:

• Genetics
• Medical Diagnostics
• Bioethics

Background:

• Recent advances in human genome research have increased interest in genetic testing.
• Genetic testing results are definitive and have implications for patients and their families, necessitating a thorough risk/benefit assessment.

Discussion:

• French legislation distinguishes between diagnostic tests for symptomatic individuals and predictive tests for asymptomatic individuals with family history.
• Predictive genetic tests can only be ordered by multidisciplinary teams with clinical and genetic expertise.
• Physicians must obtain informed consent, use accredited laboratories, and communicate results directly to patients, respecting confidentiality, especially concerning family members.

Key Insights:

• For monogenic diseases, genetic testing has significant diagnostic value, though limitations exist.
• In multifactorial diseases, genetic testing identifies low-risk factors, requiring interpretation alongside clinical presentation, family history, and genetic background.
• The predictive value of genetic tests is often limited, particularly when family members are affected, and requires careful communication to avoid patient anxiety.

Outlook:

• Genetic testing for diseases like Paget's disease of bone and rheumatoid arthritis illustrates the complexities of interpreting results in monogenic and multifactorial conditions.
• Future applications will likely involve refining the interpretation of genetic data for complex diseases.
• Continued ethical and legislative oversight is crucial for responsible implementation of genetic testing.