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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q14524: Variant p.Ala997Ser

Sodium channel protein type 5 subunit alpha
Gene: SCN5A
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Variant information Variant position: help 997 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 Alanine (A) to Serine (S) at position 997 (A997S, p.Ala997Ser). 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 small size and hydrophobic (A) to small size and polar (S) 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 LQT3; also found in patients with atrial fibrillation; sodium current characterized by slower decay and a 2- to 3-fold increase in late sodium current. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 997 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 2016 The length of the canonical sequence.
Location on the sequence: help TWDFCCGLLRQRPQKPAALA A QGQLPSCIATPYSPPPPETE 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                         TWDFCCGLLRQRPQKPAALAAQGQLPSCIATPYSPPPPETE

Mouse                         TWDFCCGLLRRRPKKPAALATHSQLPSCIAAPRSPPPPEVE

Rat                           TWDFCCGILRRRPKKPAALATHSQLPSCITAPRSPPPPEVE
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 – 2016 Sodium channel protein type 5 subunit alpha
Topological domain 942 – 1203 Cytoplasmic



Literature citations
Postmortem molecular analysis of SCN5A defects in sudden infant death syndrome.
Ackerman M.J.; Siu B.L.; Sturner W.Q.; Tester D.J.; Valdivia C.R.; Makielski J.C.; Towbin J.A.;
JAMA 286:2264-2269(2001)
Cited for: CHARACTERIZATION OF VARIANTS LQT3 SER-997 AND HIS-1826; Cardiac sodium channel (SCN5A) variants associated with atrial fibrillation.
Darbar D.; Kannankeril P.J.; Donahue B.S.; Kucera G.; Stubblefield T.; Haines J.L.; George A.L. Jr.; Roden D.M.;
Circulation 117:1927-1935(2008)
Cited for: VARIANTS ATFB10 ILE-138; LEU-216; HIS-376; LYS-428; ASP-445; LYS-470; ASP-572; LYS-655; LYS-1053; ILE-1131; CYS-1826 AND MET-1951; VARIANTS CYS-34; VAL-461; TRP-481; TYR-524; ARG-558; PHE-618; SER-997 AND TYR-1103; VARIANTS LQT3 GLN-1193; LEU-1951 AND LEU-2004; Spectrum and prevalence of mutations from the first 2,500 consecutive unrelated patients referred for the FAMILION long QT syndrome genetic test.
Kapplinger J.D.; Tester D.J.; Salisbury B.A.; Carr J.L.; Harris-Kerr C.; Pollevick G.D.; Wilde A.A.; Ackerman M.J.;
Heart Rhythm 6:1297-1303(2009)
Cited for: VARIANTS LQT3 GLN-18; HIS-27; GLY-30; GLN-43; LYS-48; SER-52; GLN-53; GLY-104; GLY-115; LEU-125; PRO-212; GLN-222; TRP-225; MET-240; LEU-247; LYS-275; SER-289; TRP-340; CYS-367; MET-370; THR-397; LYS-406; VAL-409; MET-411; GLU-429 DEL; ALA-462; VAL-530; GLN-535; TRP-569; ILE-571; SER-572; VAL-572; 586-ALA-LEU-587 DEL; GLU-615; ARG-639; LYS-654; PRO-673; CYS-689; LEU-701; ILE-731; ARG-750; ASN-772; TYR-816; PHE-848; LYS-960; LEU-965; PHE-981; SER-997; ARG-1004; LYS-1053; MET-1069; VAL-1100; ASN-1114; ASN-1166; SER-1199; ILE-1212 DEL; MET-1283; MET-1304; SER-1325; SER-1326; VAL-1334; VAL-1338; SER-1432; SER-1472; CYS-1473; GLU-1481; LEU-1487; ARG-1488; ASP-1489; ARG-1493; SER-1495; VAL-1498; VAL-1501; ASN-1505; ILE-1532; PHE-1560; MET-1593; SER-1594; ILE-1596; PHE-1617 DEL; GLN-1623; LEU-1623; HIS-1626; CYS-1644; PHE-1650; THR-1652; ASN-1723; TRP-1739; HIS-1761; PHE-1761; MET-1763; MET-1777; MET-1779; LYS-1784; CYS-1795; HIS-1826; GLY-1839; TRP-1897; GLN-1901; ASN-1977; VAL-2004 AND CYS-2012;
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.