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UniProtKB/Swiss-Prot P45378: Variant p.Arg74His

Troponin T, fast skeletal muscle
Gene: TNNT3
Variant information

Variant position:  74
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Arginine (R) to Histidine (H) at position 74 (R74H, p.Arg74His).
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:  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:  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

Involvement in disease:  Arthrogryposis, distal, 2B2 (DA2B2) [MIM:618435]: A form of distal arthrogryposis, a disease characterized by congenital joint contractures that mainly involve two or more distal parts of the limbs, in the absence of a primary neurological or muscle disease. Distal arthrogryposis type 2 is characterized by contractures of the hands and feet, and a distinctive face characterized by prominent nasolabial folds, small mouth and downslanting palpebral fissures. DA2B2 inheritance is autosomal dominant. {ECO:0000269|PubMed:12865991, ECO:0000269|PubMed:19142688, ECO:0000269|PubMed:21402185, ECO:0000269|PubMed:25337069}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In DA2B2.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  74
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  269
The length of the canonical sequence.

Location on the sequence:   LTAPKIPEGEKVDFDDIQKK  R QNKDLMELQALIDSHFEARK
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: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         LTAPKIPEGEKVDFDDIQKKRQNKDLMELQALIDSHFEARK

Mouse                         LTAPKIPEGEKVDFDDIQKKRQNKDLMELQALIDSHFEARK

Rat                           LTAPKIPEGEKVDFDDIQKKRQNKDLMELQALIDSHFEARK

Pig                           LTAPKIPEGEKVDFDDIQKKRQNKDLMELQALIDSHFEARK

Bovine                        LTAPKIPEGEKVDFDDIQKKRQNKDLMELQALIDSHFEARK

Rabbit                        LTAPKIPEGEKVDFDDIQKKRQNKDLMELQALIDSHFEARK

Chicken                       LTAPKIPEGEKVDFDDIQKKRQNKDLIELQALIDSHFEARR

Sequence annotation in neighborhood:  
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 – 269 Troponin T, fast skeletal muscle
Modified residue 88 – 88 Phosphoserine


Literature citations

Mutations in TNNT3 cause multiple congenital contractures: a second locus for distal arthrogryposis type 2B.
Sung S.S.; Brassington A.-M.E.; Krakowiak P.A.; Carey J.C.; Jorde L.B.; Bamshad M.;
Am. J. Hum. Genet. 73:212-214(2003)
Cited for: INVOLVEMENT IN DA2B2; VARIANT DA2B2 HIS-74;

Skeletal muscle contractile gene (TNNT3, MYH3, TPM2) mutations not found in vertical talus or clubfoot.
Gurnett C.A.; Alaee F.; Desruisseau D.; Boehm S.; Dobbs M.B.;
Clin. Orthop. Relat. Res. 467:1195-1200(2009)
Cited for: INVOLVEMENT IN DA2B2; VARIANT DA2B2 HIS-74;

Exome sequencing identifies a dominant TNNT3 mutation in a large family with distal arthrogryposis.
Daly S.B.; Shah H.; O'Sullivan J.; Anderson B.; Bhaskar S.; Williams S.; Al-Sheqaih N.; Mueed Bidchol A.; Banka S.; Newman W.G.; Girisha K.M.;
Mol. Syndromol. 5:218-228(2014)
Cited for: INVOLVEMENT IN DA2B2; VARIANT DA2B2 HIS-74;

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.