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X-linked ataxias.

Ginevra Zanni1, Enrico Bertini1

  • 1Unit of Neuromuscular and Neurodegenerative Disorders, Bambino Gesu' Children's Research Hospital, Rome, Italy.

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|June 13, 2018
PubMed
Summary
This summary is machine-generated.

X-linked cerebellar ataxias (XLCA) are diverse genetic disorders affecting the cerebellum. Early genetic counseling is crucial for families due to the high risk of X-linked inheritance in males.

Keywords:
X-chromosome (or X-linked)ataxiacerebellar atrophycerebellar hypoplasiaintellectual disabililty

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Area of Science:

  • Genetics
  • Neurology
  • Developmental Biology

Background:

  • X-linked cerebellar ataxias (XLCA) encompass a growing number of heterogeneous genetic disorders.
  • These conditions are characterized by cerebellar dysgenesis, stemming from mutations or genomic imbalances on the X chromosome.
  • Neurologic manifestations include hypotonia, developmental delay, intellectual disability, and ataxia.

Purpose of the Study:

  • To review the genetic landscape of X-linked cerebellar ataxias.
  • To highlight the clinical variability and inheritance patterns.
  • To emphasize the importance of genetic counseling for at-risk families.

Main Methods:

  • Literature review of reported XLCA cases and associated genes.
  • Analysis of genetic mutations and genomic imbalances on the X chromosome.
  • Correlation of genotype with clinical and neuroradiologic phenotypes.

Main Results:

  • Over 20 X-linked genes implicated in XLCA, primarily encoding proteins vital for brain development and synaptic function.
  • XLCA presents with variable cerebellar defects, ranging from isolated malformations to syndromic presentations with extraneurologic involvement.
  • X-linked inheritance is a significant factor, with a notable prevalence in males.

Conclusions:

  • XLCA represents an underestimated group of disorders due to X-linked inheritance patterns.
  • Genetic heterogeneity and clinical variability are hallmarks of XLCA.
  • Families with suspected cerebellar disorders should be evaluated for potential X-linked inheritance and offered genetic counseling.