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[Medical pathology due to trinucleotide repeats]
D Arenas-Aranda1, R Peñaloza, F Salamanca-Gómez
1Unidad de Investigacíon Médica en Genética Humana, Centro Médico Nacional Siglo XXI, IMSS, D.F. arenasdi@servidor.unam.mx
Gaceta Medica De Mexico
|April 16, 1999
Summary
Trinucleotide repeat expansions cause ten human diseases, including neurodegenerative disorders like Huntington's disease. These expansions explain genetic anticipation and are linked to fragile sites and epilepsy.
Area of Science:
- Genetics
- Molecular Biology
- Human Diseases
Context:
- Trinucleotide repeat expansions are implicated in numerous human genetic disorders.
- The type, number, and location of repeats vary across different diseases.
- Expansions can range from small changes in coding regions to large alterations at fragile sites.
Purpose:
- To review the role of trinucleotide repeat expansions in human diseases.
- To highlight the genetic mechanisms, including genetic anticipation, associated with these expansions.
- To discuss the involvement of expanded minisatellite sequences in specific conditions like progressive myoclonus epilepsy type 1.
Summary:
- Trinucleotide repeat expansions are the underlying cause of ten identified human diseases.
- These expansions, varying in repeat type and location, are linked to neurodegenerative conditions (e.g., Huntington's disease) and fragile sites.
- Genetic anticipation, characterized by increasing disease severity in successive generations, is explained by continuous repeat expansion.
- Expanded minisatellite sequences have also been identified in progressive myoclonus epilepsy type 1 and FRA16B.
Impact:
- Understanding trinucleotide repeat expansions is crucial for diagnosing and potentially treating a range of genetic disorders.
- The study emphasizes the importance of these expansions in common human degenerative diseases.
- This knowledge aids in comprehending peculiar inheritance patterns and their link to complex diseases.