Tibial muscular dystrophy is a titinopathy caused by mutations in TTN, the gene encoding the giant skeletal-muscle protein titin

Am J Hum Genet. 2002 Sep;71(3):492-500. doi: 10.1086/342380. Epub 2002 Jul 26.


Tibial muscular dystrophy (TMD) is an autosomal dominant late-onset distal myopathy linked to chromosome 2q31. The linked region includes the giant TTN gene, which encodes the central sarcomeric protein, titin. We have previously shown a secondary calpain-3 defect to be associated with TMD, which further underscored that titin is the candidate. We now report the first mutations in TTN to cause a human skeletal-muscle disease, TMD. In Mex6, the last exon of TTN, a unique 11-bp deletion/insertion mutation, changing four amino acid residues, completely cosegregated with all tested 81 Finnish patients with TMD in 12 unrelated families. The mutation was not found in 216 Finnish control samples. In a French family with TMD, a Leu-->Pro mutation at position 293,357 in Mex6 was discovered. Mex6 is adjacent to the known calpain-3 binding site Mex5 of M-line titin. Immunohistochemical analysis using two exon-specific antibodies directed to the M-line region of titin demonstrated the specific loss of carboxy-terminal titin epitopes in the TMD muscle samples that we studied, thus implicating a functional defect of the M-line titin in the genesis of the TMD disease phenotype.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Base Sequence
  • Chromosomes, Human, Pair 2 / genetics*
  • Connectin
  • DNA Mutational Analysis
  • Epitopes / analysis
  • Exons / genetics
  • Finland
  • France
  • Heterozygote
  • Humans
  • Immunohistochemistry
  • Molecular Sequence Data
  • Muscle Proteins / chemistry
  • Muscle Proteins / genetics*
  • Muscle Proteins / immunology
  • Muscle Proteins / metabolism
  • Muscle, Skeletal / metabolism*
  • Muscular Dystrophies / genetics*
  • Mutation / genetics*
  • Polymorphism, Single Nucleotide / genetics
  • Polymorphism, Single-Stranded Conformational
  • Protein Binding
  • Protein Kinases / chemistry
  • Protein Kinases / genetics*
  • Protein Kinases / immunology
  • Protein Kinases / metabolism
  • Reverse Transcriptase Polymerase Chain Reaction


  • Connectin
  • Epitopes
  • Muscle Proteins
  • TTN protein, human
  • Protein Kinases

Associated data

  • GENBANK/AJ277892
  • OMIM/600334