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ARX spectrum disorders: making inroads into the molecular pathology
Cheryl Shoubridge1, Tod Fullston, Jozef Gécz
1Department of Genetics and Molecular Pathology, SA Pathology at the Women's and Children's Hospital, North Adelaide, South Australia 5006, Australia. cheryl.shoubridge@adelaide.edu.au
Human Mutation
|May 28, 2010
Summary
Mutations in the Aristaless-related homeobox gene (ARX) cause X-linked intellectual disability (ID) and related disorders. Studies reveal diverse ARX mutations leading to varied clinical presentations and guiding research into therapeutic interventions.
Area of Science:
- Genetics
- Neuroscience
- Developmental Biology
Background:
- The Aristaless-related homeobox gene (ARX) is crucial for brain development.
- Mutations in ARX are a significant cause of X-linked intellectual disability (ID).
- Over 44 distinct ARX mutations have been identified in nearly 100 families.
Purpose of the Study:
- To review the spectrum of phenotypes associated with ARX mutations.
- To explore the genetic heterogeneity and clinical pleiotropy of ARX-related disorders.
- To highlight recent advances in understanding ARX molecular pathology and potential therapies.
Main Methods:
- Literature review of reported ARX mutation cases.
- Analysis of genotype-phenotype correlations.
- Review of findings from animal and cellular models.
Main Results:
- ARX mutations are linked to at least 10 distinct clinical entities, including Ohtahara syndrome and X-linked infantile spasms.
- Polyalanine tract expansions constitute 59% of identified ARX mutations.
- Significant intra- and interfamilial variability in clinical presentation is observed.
- Carrier females can exhibit phenotypes, particularly malformations.
Conclusions:
- ARX mutations represent a major genetic cause of X-linked ID with diverse clinical outcomes.
- Understanding ARX's molecular function is key to developing targeted therapeutic strategies.
- Sophisticated models are providing insights into ARX pathology and potential treatments.
