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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P35499: Variant p.Gln270Lys

Sodium channel protein type 4 subunit alpha
Gene: SCN4A
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Variant information Variant position: help 270 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LP/P [Disclaimer] The variants are classified into three categories: LP/P, LB/B and US.
  • LP/P: likely pathogenic or pathogenic.
  • LB/B: likely benign or benign.
  • US: uncertain significance
Residue change: help From Glutamine (Q) to Lysine (K) at position 270 (Q270K, p.Gln270Lys). 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: help Change from medium size and polar (Q) to large size and basic (K) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 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
Variant description: help In PMC. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 270 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 1836 The length of the canonical sequence.
Location on the sequence: help LSDVMILTVFCLSVFALVGL Q LFMGNLRQKCVRWPPPFNDT 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences. 
Human                         LSDVMILTVFCLSVFALVGLQLFMGNLRQKCVRWPPPFNDT

Mouse                         LSDVMILTVFCLSVFALVGLQLFMGNLRQKCVRWPPPMNDT

Rat                           LSDVMILTVFCLSVFALVGLQLFMGNLRQKCVRWPPPMNDT

Horse                         LSDVMILTVFCLSVFALVGLQLFMGNLRQKCVRWPQPFNDT
Sequence annotation in neighborhood: help 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 253 – 272 Helical; Name=S5 of repeat I
Repeat 113 – 454 I
Glycosylation 288 – 288 N-linked (GlcNAc...) asparagine
Helix 251 – 272



Literature citations
Cold extends electromyography distinction between ion channel mutations causing myotonia.
Fournier E.; Viala K.; Gervais H.; Sternberg D.; Arzel-Hezode M.; Laforet P.; Eymard B.; Tabti N.; Willer J.-C.; Vial C.; Fontaine B.;
Ann. Neurol. 60:356-365(2006)
Cited for: VARIANT PMC LYS-270; VARIANTS MYOSCN4A THR-715; ASN-804 AND ASN-1310; What causes paramyotonia in the United Kingdom? Common and new SCN4A mutations revealed.
Matthews E.; Tan S.V.; Fialho D.; Sweeney M.G.; Sud R.; Haworth A.; Stanley E.; Cea G.; Davis M.B.; Hanna M.G.;
Neurology 70:50-53(2008)
Cited for: VARIANTS PMC LYS-270; MET-704; ALA-1306; GLU-1306; MET-1313; PRO-1436; CYS-1448; HIS-1448; LEU-1448; GLU-1456; SER-1473 AND MET-1589;
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.