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UniProtKB/Swiss-Prot P35498: Variant p.Phe1687Ser

Sodium channel protein type 1 subunit alpha
Gene: SCN1A
Variant information

Variant position:  1687
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 Phenylalanine (F) to Serine (S) at position 1687 (F1687S, p.Phe1687Ser).
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 large size and aromatic (F) to small size and polar (S)
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:  Generalized epilepsy with febrile seizures plus 2 (GEFS+2) [MIM:604403]: A rare autosomal dominant, familial condition with incomplete penetrance and large intrafamilial variability. Patients display febrile seizures persisting sometimes beyond the age of 6 years and/or a variety of afebrile seizure types. This disease combines febrile seizures, generalized seizures often precipitated by fever at age 6 years or more, and partial seizures, with a variable degree of severity. {ECO:0000269|PubMed:10742094, ECO:0000269|PubMed:11254444, ECO:0000269|PubMed:11254445, ECO:0000269|PubMed:11524484, ECO:0000269|PubMed:11756608, ECO:0000269|PubMed:12535936, ECO:0000269|PubMed:12576172, ECO:0000269|PubMed:12919402, ECO:0000269|PubMed:14672992, ECO:0000269|PubMed:15525788, ECO:0000269|PubMed:15694566, ECO:0000269|PubMed:15715999, ECO:0000269|PubMed:16525050, ECO:0000269|PubMed:17347258, ECO:0000269|PubMed:17507202, ECO:0000269|PubMed:17561957, ECO:0000269|PubMed:17927801, ECO:0000269|PubMed:17928445, ECO:0000269|PubMed:18251839, ECO:0000269|PubMed:18413471, ECO:0000269|PubMed:18566737, ECO:0000269|PubMed:19339291, ECO:0000269|PubMed:19464195, ECO:0000269|PubMed:19522081, ECO:0000269|PubMed:20117752, ECO:0000269|PubMed:20550552, ECO:0000269|PubMed:20600615, ECO:0000269|PubMed:20729507, ECO:0000269|PubMed:21248271, ECO:0000269|PubMed:21864321}. 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 GEFS+2.
Any additional useful information about the variant.

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

Sequence information

Variant position:  1687
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  2009
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 – 2009 Sodium channel protein type 1 subunit alpha
Transmembrane 1670 – 1687 Helical; Name=S5 of repeat IV
Repeat 1523 – 1821 IV

Literature citations

Idiopathic epilepsies with seizures precipitated by fever and SCN1A abnormalities.
Marini C.; Mei D.; Temudo T.; Ferrari A.R.; Buti D.; Dravet C.; Dias A.I.; Moreira A.; Calado E.; Seri S.; Neville B.; Narbona J.; Reid E.; Michelucci R.; Sicca F.; Cross H.J.; Guerrini R.;
Epilepsia 48:1678-1685(2007)
Cited for: VARIANTS EIEE6 GLN-101; ILE-322; GLY-356; THR-358; CYS-393; HIS-393; LEU-957; TYR-1414; TRP-1470; ARG-1588; TYR-1608; MET-1630; ARG-1658; ARG-1716; VAL-1783 AND LYS-1787; VARIANTS GEFS+2 PRO-74; ARG-1204 AND SER-1687;

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.