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UniProtKB/Swiss-Prot Q8NHS3: Variant p.Glu336Gln

Major facilitator superfamily domain-containing protein 8
Gene: MFSD8
Variant information

Variant position:  336
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 Glutamate (E) to Glutamine (Q) at position 336 (E336Q, p.Glu336Gln).
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 (E) to medium size and polar (Q)
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

Involvement in disease:  Macular dystrophy with central cone involvement (CCMD) [MIM:616170]: An ocular disease characterized by decreased visual acuity, slight pigmentary changes and color vision abnormalities, becoming apparent in the third to sixth decade of life. Fundus anomalies are variable and include bull's eye maculopathy, severe atrophy of central fovea, relatively spared fovea with surrounding atrophic ring, central retinal pigment epithelium and/or choroid changes, pale or atrophic peripapillary area, pale optic disk, relatively spared periphery, and slightly or moderately attenuated vessels. {ECO:0000269|PubMed:25227500}. 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 CCMD.
Any additional useful information about the variant.

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



Sequence information

Variant position:  336
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  518
The length of the canonical sequence.

Location on the sequence:   LGVEAVVIFLGVKLLSKKIG  E RAILLGGLIVVWVGFFILLP
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                         LGVEAVVIFLGVKLLSKKIGERAILLGGLIVVWVGFFILLP

Mouse                         FGVEAVLVFMGVKLLSKKIGERAILLGGFVVVWVGFFILLP

Xenopus laevis                VGVESVIVFLTVKILCKKTGERVLLLGGLAVIWIGFFILLP

Zebrafish                     IGFESILVFLVVKVVSARVGDRPLLLGGLILIFVGFFMLLP

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 – 518 Major facilitator superfamily domain-containing protein 8
Topological domain 326 – 337 Cytoplasmic
Alternative sequence 237 – 518 Missing. In isoform 2.


Literature citations

Mutations in MFSD8, encoding a lysosomal membrane protein, are associated with nonsyndromic autosomal recessive macular dystrophy.
Roosing S.; van den Born L.I.; Sangermano R.; Banfi S.; Koenekoop R.K.; Zonneveld-Vrieling M.N.; Klaver C.C.; van Lith-Verhoeven J.J.; Cremers F.P.; den Hollander A.I.; Hoyng C.B.;
Ophthalmology 122:170-179(2015)
Cited for: INVOLVEMENT IN CCMD; VARIANT CCMD GLN-336;

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.