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UniProtKB/Swiss-Prot P02458: Variant p.Gly303Asp

Collagen alpha-1(II) chain
Gene: COL2A1
Chromosomal location: 12q13.11-q13.2
Variant information

Variant position:  303
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 Glycine (G) to Aspartate (D) at position 303 (G303D, p.Gly303Asp).
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 glycine (G) to medium size and acidic (D)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -1
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:  Kniest dysplasia (KD) [MIM:156550]: Moderately severe chondrodysplasia phenotype that results from mutations in the COL2A1 gene. Characteristics of the disorder include a short trunk and extremities, mid-face hypoplasia, cleft palate, myopia, retinal detachment, and hearing loss. {ECO:0000269|PubMed:7874117, ECO:0000269|PubMed:8863156}. 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 KD; abnormal allele expressed in the cartilage.
Any additional useful information about the variant.

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

Sequence information

Variant position:  303
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  1487
The length of the canonical sequence.

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.







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.

Chain 182 – 1241 Collagen alpha-1(II) chain
Region 201 – 1214 Triple-helical region
Modified residue 287 – 287 5-hydroxylysine
Modified residue 299 – 299 5-hydroxylysine
Modified residue 308 – 308 5-hydroxylysine
Glycosylation 287 – 287 O-linked (Gal...) hydroxylysine
Glycosylation 299 – 299 O-linked (Gal...) hydroxylysine
Glycosylation 308 – 308 O-linked (Gal...) hydroxylysine
Alternative sequence 1 – 1219 Missing. In isoform 3.

Literature citations

A single amino acid substitution (G103D) in the type II collagen triple helix produces Kniest dysplasia.
Wilkin D.J.; Bogaert R.; Lachman R.S.; Rimoin D.L.; Eyres D.R.; Cohn D.H.;
Hum. Mol. Genet. 3:1999-2003(1994)
Cited for: VARIANT KD ASP-303;

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.