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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P06753: Variant p.Arg168His

Tropomyosin alpha-3 chain
Gene: TPM3
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Variant information Variant position: help 168 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LP/P [Disclaimer] The variants are classified into three categories: LP/P, LB/B and US.
  • LP/P: likely pathogenic or pathogenic.
  • LB/B: likely benign or benign.
  • US: uncertain significance

Residue change: help From Arginine (R) to Histidine (H) at position 168 (R168H, p.Arg168His). Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.
Physico-chemical properties: help Change from large size and basic (R) to medium size and polar (H) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 0 The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page

Variant description: help In CMYP4A; also found in patients with undefined congenital myopathy. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 168 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 285 The length of the canonical sequence.
Location on the sequence: help QLKEAKHIAEEADRKYEEVA R KLVIIEGDLERTEERAELAE The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.
Residue conservation: help The multiple alignment of the region surrounding the variant against various orthologous sequences.
Human                         QLKEAKHIAEEADRKYEEVARKLVIIEGDLERTEERAELAE

Mouse                         QLKEAKHIAEEADRKYEEVARKLVIIEGDLERTEERAELAE

Rat                           QLKEAKHIAEEADRKYEEVARKLVIIEGDLERTEERAELAE

Pig                           QLKEAKHIAEEADRKYEEVARKLVIIEGDLERTEERAELAE

Bovine                        QLKEAKHIAEEADRKYEEVARKLVIIEGDLERTEERAELAE

Caenorhabditis elegans        QVDEAKVIAEDADRKYEEVARKLAMVEADLERAEERAEAGE

Sequence annotation in neighborhood: help The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.
TypePositionsDescription
Chain 2 – 285 Tropomyosin alpha-3 chain
Coiled coil 1 – 285



Literature citations
A second pedigree with autosomal dominant nemaline myopathy caused by TPM3 mutation: a clinical and pathological study.
Penisson-Besnier I.; Monnier N.; Toutain A.; Dubas F.; Laing N.;
Neuromuscul. Disord. 17:330-337(2007)
Cited for: VARIANT CMYP4A HIS-168; Mutations in TPM3 are a common cause of congenital fiber type disproportion.
Clarke N.F.; Kolski H.; Dye D.E.; Lim E.; Smith R.L.; Patel R.; Fahey M.C.; Bellance R.; Romero N.B.; Johnson E.S.; Labarre-Vila A.; Monnier N.; Laing N.G.; North K.N.;
Ann. Neurol. 63:329-337(2008)
Cited for: VARIANTS CMYP4A MET-100; CYS-168; GLY-168; HIS-168; GLU-169 AND GLY-245; A TPM3 mutation causing cap myopathy.
De Paula A.M.; Franques J.; Fernandez C.; Monnier N.; Lunardi J.; Pellissier J.F.; Figarella-Branger D.; Pouget J.;
Neuromuscul. Disord. 19:685-688(2009)
Cited for: VARIANT CMYP4A HIS-168; Mutations of tropomyosin 3 (TPM3) are common and associated with type 1 myofiber hypotrophy in congenital fiber type disproportion.
Lawlor M.W.; Dechene E.T.; Roumm E.; Geggel A.S.; Moghadaszadeh B.; Beggs A.H.;
Hum. Mutat. 31:176-183(2010)
Cited for: VARIANTS CMYP4A VAL-4; PRO-91; HIS-168 AND LYS-241; Congenital fibre type disproportion associated with mutations in the tropomyosin 3 (TPM3) gene mimicking congenital myasthenia.
Munot P.; Lashley D.; Jungbluth H.; Feng L.; Pitt M.; Robb S.A.; Palace J.; Jayawant S.; Kennet R.; Beeson D.; Cullup T.; Abbs S.; Laing N.; Sewry C.; Muntoni F.;
Neuromuscul. Disord. 20:796-800(2010)
Cited for: VARIANTS CMYP4A HIS-168 AND ALA-174; Mutation update and genotype-phenotype correlations of novel and previously described mutations in TPM2 and TPM3 causing congenital myopathies.
Marttila M.; Lehtokari V.L.; Marston S.; Nyman T.A.; Barnerias C.; Beggs A.H.; Bertini E.; Ceyhan-Birsoy O.; Cintas P.; Gerard M.; Gilbert-Dussardier B.; Hogue J.S.; Longman C.; Eymard B.; Frydman M.; Kang P.B.; Klinge L.; Kolski H.; Lochmueller H.; Magy L.; Manel V.; Mayer M.; Mercuri E.; North K.N.; Peudenier-Robert S.; Pihko H.; Probst F.J.; Reisin R.; Stewart W.; Taratuto A.L.; de Visser M.; Wilichowski E.; Winer J.; Nowak K.; Laing N.G.; Winder T.L.; Monnier N.; Clarke N.F.; Pelin K.; Groenholm M.; Wallgren-Pettersson C.;
Hum. Mutat. 35:779-790(2014)
Cited for: VARIANTS CMYP4A PHE-88; VAL-100; ALA-151; CYS-168; HIS-168 AND ILE-245; VARIANTS CYS-91 AND LYS-253;
Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.