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UniProtKB/Swiss-Prot P12111: Variant p.Leu1726Arg

Collagen alpha-3(VI) chain
Gene: COL6A3
Chromosomal location: 2q37
Variant information

Variant position:  1726
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 Leucine (L) to Arginine (R) at position 1726 (L1726R, p.Leu1726Arg).
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 medium size and hydrophobic (L) to large size and basic (R)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -2
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:  Bethlem myopathy 1 (BTHLM1) [MIM:158810]: A benign proximal myopathy characterized by early childhood onset and joint contractures most frequently affecting the elbows and ankles. {ECO:0000269|PubMed:10399756, ECO:0000269|PubMed:15689448, ECO:0000269|PubMed:17886299, ECO:0000269|PubMed:9536084}. 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 BTHLM1.
Any additional useful information about the variant.

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



Sequence information

Variant position:  1726
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  3177
The length of the canonical sequence.

Location on the sequence:   INKVVYKGGRHANTKVGLEH  L RVNHFVPEAGSRLDQRVPQI
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                         INKVVYKGGRHANTKVGLEHLRVNHFVPEAGSRLDQRVPQI

Chicken                       INKVIYKGGRVANTGAAIKHLQAKHFVKEAGSRIDQRVPQI

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 26 – 3177 Collagen alpha-3(VI) chain
Domain 1639 – 1812 VWFA 9
Region 26 – 2038 Nonhelical region
Alternative sequence 1444 – 3177 Missing. In isoform 3 and isoform 5.


Literature citations

Molecular consequences of dominant Bethlem myopathy collagen VI mutations.
Baker N.L.; Moergelin M.; Pace R.A.; Peat R.A.; Adams N.E.; Gardner R.J.; Rowland L.P.; Miller G.; De Jonghe P.; Ceulemans B.; Hannibal M.C.; Edwards M.; Thompson E.M.; Jacobson R.; Quinlivan R.C.M.; Aftimos S.; Kornberg A.J.; North K.N.; Bateman J.F.; Lamande S.R.;
Ann. Neurol. 62:390-405(2007)
Cited for: VARIANT BTHLM1 ARG-1726; VARIANTS HIS-677; GLN-1576; VAL-2431; LYS-2453; HIS-2831; VAL-2988 AND ILE-3069;

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.