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Area of Science:

  • Genetics
  • Molecular Biology
  • Neurology

Background:

  • Titin gene (TTN) mutations are linked to tibial muscular dystrophy (TMD).
  • Some patients exhibit complex, severe, or unusual phenotypes beyond typical TMD.
  • Understanding the genetic basis of these variant phenotypes is crucial.

Purpose of the Study:

  • To investigate the molecular causes of varied phenotypes in patients with TTN mutations.
  • To analyze genetic and molecular data from 8 patients across 7 European families.
  • To clarify the role of TTN mutations in muscular dystrophy variability.

Main Methods:

  • Reanalysis of clinical, histopathological, and muscle imaging data.
  • Western blotting for titin protein analysis.
  • RT-PCR and Sanger sequencing for TTN gene analysis.

Main Results:

  • Western blotting revealed more severe C-terminal titin abnormalities than expected.
  • Unequal mRNA expression of TTN alleles was observed in 6 patients.
  • Novel frameshift mutations were identified in 5 patients; one patient had a novel A-band titin mutation.

Conclusions:

  • Unequal TTN transcript expression suggests reduced expression of mutated alleles, explaining severe phenotypes.
  • Homozygosity for the Iberian TMD mutation may lead to severe TMD, not LGMD2J.
  • Coexisting TTN mutations represent a significant mechanism for muscular dystrophy phenotype variability.