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Migratory Behavior of Cells Generated in Ganglionic Eminence Cultures
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Neuronal migration disorders.

Renzo Guerrini1, Elena Parrini

  • 1Pediatric Neurology and Neurogenetics Unit and Laboratories, Children's Hospital A. Meyer, University of Florence, Florence, Italy. r.guerrini@meyer.it

Neurobiology of Disease
|February 28, 2009
PubMed
Summary
This summary is machine-generated.

Neuronal migration disorders (NMDs) like lissencephaly and polymicrogyria stem from genetic mutations, leading to varied neurological impairments. Understanding these conditions is crucial for diagnosing and managing cognitive and neurological deficits.

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • Neuronal migration disorders (NMDs) encompass conditions like lissencephaly, pachygyria, and heterotopia, characterized by severe global neurological impairment.
  • These disorders arise from disruptions in neuronal migration, affecting both diffuse and focal patterns, with varying degrees of neurological and cognitive deficits.
  • Polymicrogyria, a disorder of late cortical organization, can be associated with abnormal neuronal migration and lead to specific deficits, such as language and higher cognition impairments.

Purpose of the Study:

  • To review the genetic underpinnings of various neuronal migration disorders.
  • To explore the spectrum of neurological and cognitive impairments associated with NMDs.
  • To discuss the functional consequences and understanding of malformed cortical function.

Main Methods:

  • Literature review of genetic mutations associated with NMDs.
  • Analysis of clinical presentations and associated deficits in NMDs.
  • Synthesis of current understanding regarding functional consequences in malformed cortices.

Main Results:

  • Specific genes (LIS1, DCX, ARX, TUBA1A, RELN, FLN1A, ARFGEF2, GPR56, SRPX2) are linked to different NMDs.
  • NMDs present a wide range of severity, from severe global impairment to mild cognitive deficits.
  • Focal cortical dysplasias, a type of focal migration abnormality, are highly epileptogenic.

Conclusions:

  • Genetic abnormalities are central to the etiology of NMDs.
  • The functional impact of NMDs is complex and not fully understood, with possibilities of functional conservation, atypical representation, or relocation.
  • Reliance on anatomical landmarks for functional localization may be unreliable in cases of NMDs.