UniProtKB/Swiss-Prot P78381: Variant p.Val331Ile

UDP-galactose translocator
Gene: SLC35A2
Chromosomal location: Xp11.22-p11.23
Variant information

Variant position:  331
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 Valine (V) to Isoleucine (I) at position 331 (V331I, p.Val331Ile).
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:  Similar physico-chemical property. Both residues are medium size and hydrophobic.
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  3
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:  Congenital disorder of glycosylation 2M (CDG2M) [MIM:300896]: A disorder characterized by developmental delay, hypotonia, ocular anomalies, and brain malformations. Othere more variable clinical features included seizures, hypsarrhythmia, poor feeding, microcephaly, recurrent infections, dysmorphic features, shortened limbs, and coagulation defects. Congenital disorders of glycosylation are caused by a defect in glycoprotein biosynthesis and characterized by under-glycosylated serum glycoproteins and a wide variety of clinical features. The broad spectrum of features reflects the critical role of N-glycoproteins during embryonic development, differentiation, and maintenance of cell functions. {ECO:0000269|PubMed:23561849, ECO:0000269|PubMed:24115232}. 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 CDG2M.
Any additional useful information about the variant.

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

Sequence information

Variant position:  331
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  396
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 1 – 396 UDP-galactose translocator
Transmembrane 315 – 335 Helical

Literature citations

Mosaicism of the UDP-galactose transporter SLC35A2 causes a congenital disorder of glycosylation.
Ng B.G.; Buckingham K.J.; Raymond K.; Kircher M.; Turner E.H.; He M.; Smith J.D.; Eroshkin A.; Szybowska M.; Losfeld M.E.; Chong J.X.; Kozenko M.; Li C.; Patterson M.C.; Gilbert R.D.; Nickerson D.A.; Shendure J.; Bamshad M.J.; Freeze H.H.;
Am. J. Hum. Genet. 92:632-636(2013)
Cited for: VARIANT CDG2M ILE-331;

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.