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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P35498: Variant p.Val983Ala

Sodium channel protein type 1 subunit alpha
Gene: SCN1A
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Variant information Variant position: help 983 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 Valine (V) to Alanine (A) at position 983 (V983A, p.Val983Ala). 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 hydrophobic (V) to small size and hydrophobic (A) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 0 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 ICEGTC; reduced function; decreased peak current density; results in a negative shift of inactivation and positive shift of activation. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 983 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 2009 The length of the canonical sequence.
Location on the sequence: help AGQAMCLTVFMMVMVIGNLV V LNLFLALLLSSFSADNLAAT 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                         AGQAMCLTVFMMVMVIGNLVVLNLFLALLLSSFSADNLAAT

Mouse                         AGQAMCLTVFMMVMVIGNLVVLNLFLALLLSSFSADNLAAT

Rat                           AGQAMCLTVFMMVMVIRNLVVLNLFLALLLSSFSADNLAAT
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 – 2009 Sodium channel protein type 1 subunit alpha
Transmembrane 966 – 992 Helical; Name=S6 of repeat II
Repeat 750 – 1022 II
Helix 965 – 994



Literature citations
Mutations of sodium channel alpha subunit type 1 (SCN1A) in intractable childhood epilepsies with frequent generalized tonic-clonic seizures.
Fujiwara T.; Sugawara T.; Mazaki-Miyazaki E.; Takahashi Y.; Fukushima K.; Watanabe M.; Hara K.; Morikawa T.; Yagi K.; Yamakawa K.; Inoue Y.;
Brain 126:531-546(2003)
Cited for: VARIANTS DRVT GLY-103; ILE-112; TRP-265; ASP-343; VAL-960; ILE-985; ARG-1231; LEU-1263; ASP-1685; 1807-MET--GLU-1810 DEL; GLY-1812 AND SER-1831; VARIANTS ICEGTC SER-808; ARG-979; ALA-983; ILE-1011; PHE-1611; SER-1632; ILE-1709 AND LEU-1808; VARIANT THR-1067; Sodium channel dysfunction in intractable childhood epilepsy with generalized tonic-clonic seizures.
Rhodes T.H.; Vanoye C.G.; Ohmori I.; Ogiwara I.; Yamakawa K.; George A.L. Jr.;
J. Physiol. (Lond.) 569:433-445(2005)
Cited for: VARIANTS ICEGTC SER-808 AND ILE-1011; CHARACTERIZATION OF VARIANTS ICEGTC SER-808; ARG-979; ALA-983; ILE-1011; PHE-1611; SER-1632; ILE-1709 AND LEU-1808;
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.