UniProtKB/Swiss-Prot Q8WVQ1: Variant p.Ser303Arg

Soluble calcium-activated nucleotidase 1
Gene: CANT1
Chromosomal location: 17q25.3
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 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 Serine (S) to Arginine (R) at position 303 (S303R, p.Ser303Arg).
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 small size and polar (S) to large size and basic (R)
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:  Desbuquois dysplasia (DBQD) [MIM:251450]: A chondrodysplasia characterized by severe prenatal and postnatal growth retardation (less than -5 SD), joint laxity, short extremities, progressive scoliosis, round face, midface hypoplasia, prominent bulging eyes. The main radiologic features are short long bones with metaphyseal splay, a 'Swedish key' appearance of the proximal femur (exaggerated trochanter), and advance carpal and tarsal bone age. Two forms of Desbuquois dysplasia are distinguished on the basis of the presence (type 1) or absence (type 2) of characteristic hand anomalies: an extra ossification center distal to the second metacarpal, delta phalanx, bifid distal thumb phalanx, and phalangeal dislocations. 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 DBQD1.
Any additional useful information about the variant.



Sequence information

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

Protein sequence length:  401
The length of the canonical sequence.

Location on the sequence:   HESACWSDTLQRWFFLPRRA  S QERYSEKDDERKGANLLLSA
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                         HESACWSDTLQRWFFLPRRASQERYSEKDDERKGANLLLSA

Mouse                         HESACWSDTLQRWFFLPRRASHERYSEKDDERKGSNLLLSA

Rat                           HESACWSDTLQRWFFLPRRASHERYSEREDERKGSNLLLSA

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 1 – 401 Soluble calcium-activated nucleotidase 1
Topological domain 63 – 401 Lumenal
Metal binding 284 – 284 Calcium
Alternative sequence 246 – 401 Missing. In isoform 2.
Mutagenesis 301 – 301 R -> A. Reduces activity by 99%.
Beta strand 300 – 305


Literature citations

Further delineation of CANT1 phenotypic spectrum and demonstration of its role in proteoglycan synthesis.
Nizon M.; Huber C.; De Leonardis F.; Merrina R.; Forlino A.; Fradin M.; Tuysuz B.; Abu-Libdeh B.Y.; Alanay Y.; Albrecht B.; Al-Gazali L.; Basaran S.Y.; Clayton-Smith J.; Desir J.; Gill H.; Greally M.T.; Koparir E.; van Maarle M.C.; Mackay S.; Mortier G.; Morton J.; Sillence D.; Vilain C.; Young I.; Zerres K.; Le Merrer M.; Munnich A.; Le Goff C.; Rossi A.; Cormier-Daire V.;
Hum. Mutat. 33:1261-1266(2012)
Cited for: FUNCTION IN PROTEOGLYCAN SYNTHESIS; VARIANTS DBQD1 HIS-300; ARG-303 AND ASN-374;

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.