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UniProtKB/Swiss-Prot P35499: Variant p.Met1592Val

Sodium channel protein type 4 subunit alpha
Gene: SCN4A
Variant information

Variant position:  1592
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 Methionine (M) to Valine (V) at position 1592 (M1592V, p.Met1592Val).
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:  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:  Periodic paralysis hyperkalemic (HYPP) [MIM:170500]: An autosomal dominant channelopathy characterized by episodic flaccid generalized muscle weakness associated with high levels of serum potassium. Concurrence of myotonia is found in HYPP patients. {ECO:0000269|PubMed:1659668, ECO:0000269|PubMed:1659948, ECO:0000269|PubMed:20076800}. 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.

Involvement in disease:  Periodic paralysis normokalemic (NKPP) [MIM:170500]: A disorder closely related to hyperkalemic periodic paralysis, but marked by a lack of alterations in potassium levels during attacks of muscle weakness. {ECO:0000269|PubMed:15596759, ECO:0000269|PubMed:18046642, ECO:0000269|PubMed:20522878}. 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 HYPP and NKPP.
Any additional useful information about the variant.

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



Sequence information

Variant position:  1592
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  1836
The length of the canonical sequence.

Location on the sequence:   SIGICFFCSYIIISFLIVVN  M YIAIILENFNVATEESSEPL
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                         SIGICFFCSYIIISFLIVVNMYIAIILENFNVATEESSEPL

Mouse                         SIGICFFCSYIIISFLIVVNMYIAIILENFNVATEESSEPL

Rat                           SIGICFFCSYIIISFLIVVNMYIAIILENFNVATEESSEPL

Horse                         SIGICFFCSYIIISFLIVVNMYIAIILENFNVATEESSDPL

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 – 1836 Sodium channel protein type 4 subunit alpha
Transmembrane 1575 – 1597 Helical; Name=S6 of repeat IV
Repeat 1335 – 1633 IV
Helix 1571 – 1605


Literature citations

A Met-to-Val mutation in the skeletal muscle Na+ channel alpha-subunit in hyperkalaemic periodic paralysis.
Rojas C.V.; Wang J.; Schwartz L.S.; Hoffman E.P.; Powell B.R.; Brown R.H. Jr.;
Nature 354:387-389(1991)
Cited for: VARIANT HYPP VAL-1592;

Mutations of sodium channel alpha-subunit genes in Chinese patients with normokalemic periodic paralysis.
Xiuhai G.; Weiping W.; Ke Z.; Hongbin W.; Yiling S.; Yanling M.;
Cell. Mol. Neurobiol. 28:653-661(2008)
Cited for: VARIANTS NKPP GLN-675 AND VAL-1592; VARIANT ILE-781;

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.