Lissencephaly plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
Introduction
Lissencephaly is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes. [@neonatalonset]
Lissencephaly (from Greek "lissos" meaning smooth and "enkephalos" meaning brain) is a rare brain malformation characterized by the absence of convolutions (gyri) and sulci on the surface of the brain, resulting in a smooth appearance. [@expanding]
Classification
Classic Lissencephaly
Complete agyria (no gyri)
Severe phenotype
Often associated with profound intellectual disability
Band Lissencephaly (Subcortical Band Heterotopia)
Partial lissencephaly
Band of heterotopic gray matter
Variable clinical presentation
Grinning and Pachygyria
Simplified gyral pattern
Less severe phenotype
Broader gyri than classic lissencephaly
Genetics
Major Genes
DCX (Doublecortin): X-linked dominant
LIS1 (PAFAH1B1): Autosomal dominant
ARX: X-linked
TUBA1A: Autosomal dominant
RELN: Autosomal recessive
Inheritance Patterns
X-linked (DCX, ARX)
Autosomal dominant (LIS1, TUBA1A)
Autosomal recessive (RELN, CRLM2)
Pathophysiology
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Lissencephaly
Overview
Lissencephaly plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
Introduction
Lissencephaly is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes. [@neonatalonset]
Lissencephaly (from Greek "lissos" meaning smooth and "enkephalos" meaning brain) is a rare brain malformation characterized by the absence of convolutions (gyri) and sulci on the surface of the brain, resulting in a smooth appearance. [@expanding]
Classification
Classic Lissencephaly
Complete agyria (no gyri)
Severe phenotype
Often associated with profound intellectual disability
Band Lissencephaly (Subcortical Band Heterotopia)
Partial lissencephaly
Band of heterotopic gray matter
Variable clinical presentation
Grinning and Pachygyria
Simplified gyral pattern
Less severe phenotype
Broader gyri than classic lissencephaly
Genetics
Major Genes
DCX (Doublecortin): X-linked dominant
LIS1 (PAFAH1B1): Autosomal dominant
ARX: X-linked
TUBA1A: Autosomal dominant
RELN: Autosomal recessive
Inheritance Patterns
X-linked (DCX, ARX)
Autosomal dominant (LIS1, TUBA1A)
Autosomal recessive (RELN, CRLM2)
Pathophysiology
Neuronal Migration Defects
Impaired radial migration
Failure to form proper cortical layers
Abnormal neuronal positioning
Cytoskeletal Dysfunction
Microtubule abnormalities
Dynein defects
Centrosomal dysfunction
Molecular Mechanisms
DCX affects microtubule polymerization
LIS1 regulates dynein function
Reelin pathway disruption
Clinical Features
Neurological
Severe intellectual disability
Epilepsy (present in >90%)
Developmental delays
Hypotonia progressing to spasticity
Feeding difficulties
Physical
Microcephaly (often)
Characteristic facial features
Failure to thrive
Motor impairments
Associated Conditions
Miller-Dieker syndrome (LIS1 deletion)
X-linked lissencephaly with abnormal genitalia (ARX)
Cortical malformations
Diagnosis
Imaging
MRI brain: smooth cortical surface
CT scan:agyria/pachygyria
Band heterotopia visualization
Genetic Testing
Chromosomal microarray
Targeted gene panels
Whole exome sequencing
Prenatal Diagnosis
Fetal MRI
Ultrasound (limited)
Genetic testing
Management
Seizure Control
Antiepileptic medications
Ketogenic diet
Surgical options for refractory seizures
Supportive Care
Physical therapy
Occupational therapy
Speech therapy
Feeding support
Experimental
Gene therapy approaches
Stem cell transplantation
Association with Neurodegeneration
Alzheimer's Disease
Similar cytoskeletal mechanisms
[Tau](/proteins/tau) pathology parallels
Possible shared therapeutic targets
Parkinson's Disease
Microtubule dysfunction
Axonal transport defects
Overview
Lissencephaly plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications. [@mribased]
Background
The study of Lissencephaly has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development. [@roles]
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions. [^6]
This section highlights recent publications relevant to this disease.
[Bi-allelic variants in NRDC cause a neurodevelopmental disorder characterized by neonatal lethality, microcephaly, and brain abnormalities.](https://pubmed.ncbi.nlm.nih.gov/41734767/) (2026 Mar 5) - American journal of human genetics
[Neonatal-onset epileptic encephalopathy with lissencephaly associated with a SCN3A variant: The first case in Korea and literature review.](https://pubmed.ncbi.nlm.nih.gov/41643417/) (2026 Mar) - Seizure
[Expanding genetic and clinical spectra of β-tubulinopathies: A Korean study.](https://pubmed.ncbi.nlm.nih.gov/41152456/) (2026 Mar) - Journal of human genetics
[MRI-based spectral analysis of fetal brain gyrification in typical development and in lissencephaly and polymicrogyria.](https://pubmed.ncbi.nlm.nih.gov/41720847/) (2026 Feb 20) - Scientific reports
[Roles of microtubules and LIS1 in dynein transport machinery assembly.](https://pubmed.ncbi.nlm.nih.gov/41708859/) (2026 Feb 18) - Nature
References
Pathway Diagram
The following diagram shows the key molecular relationships involving Lissencephaly discovered through SciDEX knowledge graph analysis: