Genotype/Phenotype Correlations in Tuberous Sclerosis Complex.

Area of Science:

• Genetics
• Neurology
• Oncology

Background:

• Tuberous sclerosis complex (TSC) is an autosomal dominant disorder.
• Characterized by hamartomatous lesions in multiple organs, including the brain, skin, and kidneys.
• Central nervous system involvement is common, leading to epilepsy, intellectual disability, and autism spectrum disorder in many patients.

Purpose of the Study:

• To review the genetic basis of TSC, focusing on TSC1 and TSC2 mutations.
• To understand the role of mammalian target of rapamycin (mTOR) pathway overactivation in TSC pathogenesis.
• To explore genotype-phenotype correlations and the impact of genetic testing on clinical management.

Main Methods:

• Literature review of studies on TSC genetics and clinical manifestations.
• Analysis of the molecular mechanisms involving TSC1, TSC2, and mTOR signaling.
• Examination of genotype-phenotype correlations based on identified mutations.

Main Results:

• TSC is caused by mutations in TSC1 or TSC2, encoding hamartin and tuberin, respectively.
• mTOR overactivation due to these mutations drives lesion formation and neurological abnormalities.
• TSC2 mutations are often associated with a more severe phenotype, including earlier seizures and intellectual disability.

Conclusions:

• Genetic mutations in TSC1/TSC2 are key drivers of TSC pathogenesis via mTOR pathway.
• Significant clinical variability exists, challenging individual phenotype prediction.
• Advanced molecular techniques and registries can improve mutation detection and genotype-phenotype correlations for personalized care.