Related Experiment Videos
Epileptogenic brain malformations: clinical presentation, malformative patterns and indications for genetic testing.
1Neurosciences Unit, Great Ormond Street Hospital for Sick Children and Institute of Child Health, University College London, The Wolfson Centre, Mecklenburgh Square, London WC1N 2AP, UK. R.Guerrini@ich.ucl.ac.uk
Seizure
|December 26, 2001
Summary
This review covers genetic brain malformations linked to epilepsy, including lissencephaly, heterotopia, tuberous sclerosis, schizencephaly, and polymicrogyria. It highlights genetic causes, diagnostic features, and genetic testing recommendations for these conditions.
Area of Science:
- Neurogenetics
- Developmental Neuroscience
- Epileptology
Background:
- Epilepsy frequently co-occurs with congenital malformations of the cerebral cortex.
- Understanding the genetic basis of these malformations is crucial for diagnosis and counseling.
- Several cortical malformations, including lissencephaly, heterotopia, and tuberous sclerosis, have identified genetic etiologies.
Purpose of the Study:
- To review cerebral cortical malformations commonly observed in epilepsy patients.
- To discuss the elucidated or suspected genetic bases for these malformations.
- To provide guidance on genetic testing strategies for affected individuals and families.
Main Methods:
- Review of literature on genetic causes of cortical malformations associated with epilepsy.
- Analysis of distinct imaging features differentiating lissencephaly subtypes.
- Summary of known gene mutations (LIS1, XLIS/DCX, reelin, FLNA, TSC1/TSC2, EMX2) and their associated phenotypes.
Main Results:
- Identified three main forms of lissencephaly linked to LIS1 and XLIS/DCX gene mutations.
- Subcortical band heterotopia (SBH) is associated with XLIS/DCX mutations, with varying severity in males and females.
- Other reviewed conditions include X-linked bilateral periventricular nodular heterotopia (BPNH), Tuberous Sclerosis (TS), Schizencephaly, and Polymicrogyria, each with specific genetic links and clinical presentations.
Conclusions:
- Genetic testing is indicated for epilepsy patients with specific cortical malformations.
- Distinct imaging features aid in differentiating lissencephaly subtypes and guiding genetic analysis.
- Further research is needed for conditions like schizencephaly and some forms of BPNH with unclear inheritance patterns.