UniProtKB/Swiss-Prot P49747: Variant p.Asp420Ala

Cartilage oligomeric matrix protein
Gene: COMP
Chromosomal location: 19p13.1
Variant information

Variant position:  420
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 have been found in patients and disease-association is reported in literature. However, this classification is not a definitive assessment of variant pathogenicity.
  • Polymorphism: No disease-association has been reported.
  • Unclassified: Variants have been found in patients but disease-association remains unclear.

Residue change:  From Aspartate (D) to Alanine (A) at position 420 (D420A, p.Asp420Ala).
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 acidic (D) to small size and hydrophobic (A)
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

Variant description:  In EDM1.
Any additional useful information about the variant.



Sequence information

Variant position:  420
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  757
The length of the canonical sequence.

Location on the sequence:   GDGIGDACDNCPQKSNPDQA  D VDHDFVGDACDSDQDQDGDG
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                         GDGIGDACDNCPQKSNPDQADVDHDFVGDACDSDQDQDGDG

Mouse                         GDGVGDACDNCPQKDNPDQRDVDHDFVGDACDSDQDQDGDG

Rat                           GDGVGDACDNCPQKDNPDQRDVDHDFVGDACDSDQDQDGDG

Bovine                        GDGVGDACDNCPQKSNADQRDVDHDFVGDACDSDQDQDGDG

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 21 – 757 Cartilage oligomeric matrix protein
Repeat 419 – 456 TSP type-3 6
Disulfide bond 410 – 430


Literature citations

A mutation in COL9A1 causes multiple epiphyseal dysplasia: further evidence for locus heterogeneity.
Czarny-Ratajczak M.; Lohiniva J.; Rogala P.; Kozlowski K.; Peraelae M.; Carter L.; Spector T.D.; Kolodziej L.; Seppaenen U.; Glazar R.; Krolewski J.; Latos-Bielenska A.; Ala-Kokko L.;
Am. J. Hum. Genet. 69:969-980(2001)
Cited for: VARIANTS EDM1 ARG-276; ALA-420 AND MET-585;

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.