¿Cómo caracterizar una enfermedad genética?
Characterizing a Genetic Disease
Introduction to Genetic Disease Characterization
- The lesson focuses on how to characterize a genetic disease, starting from the clinical phenotype of a patient with symptoms.
- A workflow diagram is introduced, outlining steps based on results obtained during the characterization process.
Initial Steps in Diagnosis
- The first step involves determining if the disease has known mutations; if so, tests are designed to study these mutations.
- If mutations are present, they are recorded in the family history and genetic counseling may be provided regarding transmission possibilities.
Family Study and Inheritance Patterns
- It is essential to study not just the affected individual but also two or three generations of relatives to establish inheritance patterns and identify carriers.
- This comprehensive approach helps inform all family members about potential risks associated with the disease.
Detecting Unknown Mutations
- If known mutations are absent, sequencing methods such as microarrays can be employed to detect genetic variants present in the patient.
- A linkage or association study may follow to determine which variants correlate more strongly with the disease and identify involved proteins.
Functional Analysis of Mutations
- Once mutations are identified, understanding their functional impact is crucial; this involves studying protein expression levels related to those mutations.
- Two scenarios arise: either proteins related to the mutation are known (allowing direct measurement) or unknown (requiring expression studies in mutant cells).
Expression Studies and Protein Functionality
- Transcriptomic analysis can reveal whether protein expression levels are normal or decreased; abnormal levels suggest structural changes affecting functionality.
- Further interaction tests may be necessary to understand why a protein does not function correctly—whether due to transcription issues or inherent instability at the protein level.