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Translation01:31

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Label-Free Non-Linear Optics for the Study of Tubulin-Dependent Defects in Central Myelin
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Mutations in TUBB4B Cause a Distinctive Sensorineural Disease.

Romain Luscan1, Sabrina Mechaussier2, Antoine Paul1

  • 1Laboratory of Embryology and Genetics of Human Malformation, INSERM UMR1163, Institute of Genetic Diseases, Imagine and Paris Descartes University, 75015 Paris, France.

American Journal of Human Genetics
|December 5, 2017
PubMed
Summary
This summary is machine-generated.

Mutations in TUBB4B cause Leber congenital amaurosis (LCA) and hearing loss by disrupting microtubule dynamics. This finding links sensorineural diseases to microtubule anomalies, distinct from ciliary dysfunction.

Keywords:
Leber congenital amaurosisTUBB4Babnormal dynamics of microtubule growthde novo mutationsdominant mutationsearly-onset sensorineural hearing lossmosaicismretino-cochlear tubulinopathy

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Area of Science:

  • Genetics
  • Neurobiology
  • Cell Biology

Background:

  • Leber congenital amaurosis (LCA) is a severe inherited retinal disease causing early-onset blindness.
  • LCA is typically linked to photoreceptor dysfunction, but syndromic forms exist.
  • Microtubules (MTs) are crucial cytoskeletal components involved in cellular structure and function.

Purpose of the Study:

  • To investigate the genetic basis of an atypical LCA presentation with early-onset hearing loss.
  • To identify novel genes and understand the molecular mechanisms underlying syndromic LCA.
  • To explore the role of beta-tubulin 4B isotype (TUBB4B) in LCA pathogenesis.

Main Methods:

  • Exome sequencing was performed on a multiplex family and simplex cases with LCA and hearing loss.
  • Structural analysis of the identified TUBB4B mutations.
  • Functional studies using cell culture (overexpression) and patient-derived fibroblasts to assess MT dynamics.

Main Results:

  • Two heterozygous mutations in TUBB4B, affecting Arg391, were identified in affected individuals.
  • The Arg391 residue is critical for MT stability through interaction with alpha-tubulin.
  • Mutant TUBB4B assembled into MTs but significantly altered MT growth dynamics.

Conclusions:

  • This study identifies TUBB4B mutations as a cause of syndromic LCA associated with hearing loss.
  • The findings establish a link between sensorineural diseases and aberrant MT behavior.
  • This LCA form is unrelated to known ciliary dysfunction, highlighting novel pathogenic pathways.