UniProtKB/Swiss-Prot Q9UMX9: Variant p.Asp157Asn

Membrane-associated transporter protein
Gene: SLC45A2
Chromosomal location: 5p15.1
Variant information

Variant position:  157
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 Aspartate (D) to Asparagine (N) at position 157 (D157N, p.Asp157Asn).
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 medium size and polar (N)
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:  Albinism, oculocutaneous, 4 (OCA4) [MIM:606574]: A disorder of pigmentation characterized by reduced biosynthesis of melanin in the skin, hair and eyes. Patients show reduced or lacking pigmentation associated with classic albinism ocular abnormalities, including decreased visual acuity, macular hypoplasia, optic dysplasia, atypical choroidal vessels, and nystagmus. {ECO:0000269|PubMed:11574907, ECO:0000269|PubMed:14722913, ECO:0000269|PubMed:14961451, ECO:0000269|PubMed:15656822, ECO:0000269|PubMed:17768386, ECO:0000269|PubMed:19865097, ECO:0000269|PubMed:23504663}. 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 OCA4.
Any additional useful information about the variant.

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

Sequence information

Variant position:  157
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  530
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 – 530 Membrane-associated transporter protein
Transmembrane 139 – 159 Helical; Name=4
Alternative sequence 129 – 187 Missing. In isoform 3.

Literature citations

Oculocutaneous albinism type 4 is one of the most common types of albinism in Japan.
Inagaki K.; Suzuki T.; Shimizu H.; Ishii N.; Umezawa Y.; Tada J.; Kikuchi N.; Takata M.; Takamori K.; Kishibe M.; Tanaka M.; Miyamura Y.; Ito S.; Tomita Y.;
Am. J. Hum. Genet. 74:466-471(2004)
Cited for: VARIANTS OCA4 SER-58; ASN-157 AND VAL-188; VARIANTS LYS-272; PRO-500 AND LEU-507;

A Korean case of oculocutaneous albinism type IV caused by a D157N mutation in the MATP gene.
Suzuki T.; Inagaki K.; Fukai K.; Obana A.; Lee S.-T.; Tomita Y.;
Br. J. Dermatol. 152:174-175(2005)
Cited for: VARIANT OCA4 ASN-157;

SLC45A2 variations in Indian oculocutaneous albinism patients.
Sengupta M.; Chaki M.; Arti N.; Ray K.;
Mol. Vis. 13:1406-1411(2007)
Cited for: VARIANTS OCA4 ILE-42; SER-64; ASN-157; SER-302 AND CYS-348; VARIANTS LYS-272 AND PHE-374;

A comprehensive analysis reveals mutational spectra and common alleles in Chinese patients with oculocutaneous albinism.
Wei A.; Wang Y.; Long Y.; Wang Y.; Guo X.; Zhou Z.; Zhu W.; Liu J.; Bian X.; Lian S.; Li W.;
J. Invest. Dermatol. 130:716-724(2010)
Cited for: VARIANTS OCA4 ARG-110; PRO-151; ASN-157; HIS-160; GLN-233; ARG-349; LYS-368 AND LEU-418;

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.