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UniProtKB/Swiss-Prot Q14524: Variant p.Thr220Ile

Sodium channel protein type 5 subunit alpha
Gene: SCN5A
Chromosomal location: 3p21
Variant information

Variant position:  220
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 Threonine (T) to Isoleucine (I) at position 220 (T220I, p.Thr220Ile).
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 medium size and polar (T) to medium size and hydrophobic (I)
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:  Sick sinus syndrome 1 (SSS1) [MIM:608567]: The term 'sick sinus syndrome' encompasses a variety of conditions caused by sinus node dysfunction. The most common clinical manifestations are syncope, presyncope, dizziness, and fatigue. Electrocardiogram typically shows sinus bradycardia, sinus arrest, and/or sinoatrial block. Episodes of atrial tachycardias coexisting with sinus bradycardia ('tachycardia-bradycardia syndrome') are also common in this disorder. SSS occurs most often in the elderly associated with underlying heart disease or previous cardiac surgery, but can also occur in the fetus, infant, or child without heart disease or other contributing factors. SSS1 onset is in utero, infancy, or early childhood. {ECO:0000269|PubMed:11748104, ECO:0000269|PubMed:14523039, ECO:0000269|PubMed:22795782}. 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:  Brugada syndrome 1 (BRGDA1) [MIM:601144]: A tachyarrhythmia characterized by right bundle branch block and ST segment elevation on an electrocardiogram (ECG). It can cause the ventricles to beat so fast that the blood is prevented from circulating efficiently in the body. When this situation occurs, the individual will faint and may die in a few minutes if the heart is not reset. {ECO:0000269|PubMed:10532948, ECO:0000269|PubMed:10618304, ECO:0000269|PubMed:10690282, ECO:0000269|PubMed:11410597, ECO:0000269|PubMed:11748104, ECO:0000269|PubMed:11823453, ECO:0000269|PubMed:11901046, ECO:0000269|PubMed:12051963, ECO:0000269|PubMed:12106943, ECO:0000269|PubMed:15023552, ECO:0000269|PubMed:15338453, ECO:0000269|PubMed:15579534, ECO:0000269|PubMed:15851320, ECO:0000269|PubMed:16266370, ECO:0000269|PubMed:16325048, ECO:0000269|PubMed:16616735, ECO:0000269|PubMed:17075016, ECO:0000269|PubMed:17081365, ECO:0000269|PubMed:17198989, ECO:0000269|PubMed:18252757, ECO:0000269|PubMed:18341814, ECO:0000269|PubMed:18451998, ECO:0000269|PubMed:18456723, ECO:0000269|PubMed:18616619, ECO:0000269|PubMed:19251209, ECO:0000269|PubMed:19272188, ECO:0000269|PubMed:20129283, ECO:0000269|PubMed:23085483, ECO:0000269|PubMed:23420830, ECO:0000269|PubMed:24167619, ECO:0000269|PubMed:26279430, ECO:0000269|PubMed:26776555, ECO:0000269|PubMed:9521325}. 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 SSS1 and BRGDA1.
Any additional useful information about the variant.

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



Sequence information

Variant position:  220
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  2016
The length of the canonical sequence.

Location on the sequence:   VIIMAYTTEFVDLGNVSALR  T FRVLRALKTISVISGLKTIV
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                         VIIMAYTTEFVDLGNVSALRTFRVLRALKTISVISGLKTIV

Mouse                         VIVMAYTTEFVDLGNVSALRTFRVLRALKTISVISGLKTIV

Rat                           VIVMAYTTEFVDLGNVSALRTFRVLRALKTISVISGLKTIV

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 – 2016 Sodium channel protein type 5 subunit alpha
Transmembrane 217 – 233 Helical; Name=S4 of repeat I
Repeat 113 – 420 I
Glycosylation 214 – 214 N-linked (GlcNAc...) asparagine


Literature citations

Congenital sick sinus syndrome caused by recessive mutations in the cardiac sodium channel gene (SCN5A).
Benson D.W.; Wang D.W.; Dyment M.; Knilans T.K.; Fish F.A.; Strieper M.J.; Rhodes T.H.; George A.L. Jr.;
J. Clin. Invest. 112:1019-1028(2003)
Cited for: VARIANTS SSS1 ILE-220; LEU-1298 AND ARG-1408;

An international compendium of mutations in the SCN5A-encoded cardiac sodium channel in patients referred for Brugada syndrome genetic testing.
Kapplinger J.D.; Tester D.J.; Alders M.; Benito B.; Berthet M.; Brugada J.; Brugada P.; Fressart V.; Guerchicoff A.; Harris-Kerr C.; Kamakura S.; Kyndt F.; Koopmann T.T.; Miyamoto Y.; Pfeiffer R.; Pollevick G.D.; Probst V.; Zumhagen S.; Vatta M.; Towbin J.A.; Shimizu W.; Schulze-Bahr E.; Antzelevitch C.; Salisbury B.A.; Guicheney P.; Wilde A.A.; Brugada R.; Schott J.J.; Ackerman M.J.;
Heart Rhythm 7:33-46(2010)
Cited for: VARIANTS TRP-18; CYS-34; HIS-34; LEU-216; SER-286; SER-291; MET-299; CYS-376; GLY-447; ALA-449; VAL-461; SER-475; TRP-481; TYR-524; ARG-558; HIS-568; ARG-579; LYS-592; GLY-596; ALA-601; PHE-618; ASP-638; LEU-656; THR-672; HIS-689; LYS-692; PHE-705; ILE-924; GLN-986; MET-1016; ARG-1040; ALA-1082; LEU-1090; LEU-1098; TYR-1103; LYS-1107; TRP-1116; GLN-1193; MET-1251; SER-1293; PHE-1308; TRP-1512; ASN-1787; THR-1836; LYS-1901; CYS-1919; LEU-1951; GLN-1958; LEU-1962; MET-1968; GLN-1991; LEU-2004 AND ALA-2006; VARIANTS BRGDA1 GLN-18; LYS-70; ASN-84; SER-93; SER-94; GLN-104; TRP-104; LYS-109; GLN-121; TRP-121; GLU-126; PRO-136; MET-146; GLN-161; LYS-161; ASN-175; GLY-178; ARG-182; VAL-185; VAL-204; GLN-212; ILE-220; GLN-222; LEU-223; TRP-225; VAL-226; ILE-232; MET-240; LYS-270; GLN-276; ASP-278; CYS-282; ILE-300; PRO-315; ASN-320; ARG-325; LEU-336; ASP-351; VAL-351; ASN-356; CYS-367; HIS-367; LEU-367; LYS-369; GLY-374; HIS-376; ARG-386; GLU-386; ALA-396; LEU-396; LYS-439; GLY-501; HIS-526; CYS-532; LEU-543; ARG-552; GLU-615; PHE-619; CYS-620; MET-632; ALA-640; ASP-647; LEU-648; TRP-661; GLY-683; LEU-701; LEU-717; VAL-735; LYS-746; ARG-752; GLU-758; ARG-764; ASN-772; SER-773; ILE-789; PRO-808; PRO-839; LEU-851; GLN-867; CYS-878; HIS-878; PRO-886; CYS-893; HIS-893; LYS-901; LEU-910; ARG-915; ARG-917; SER-927; PRO-928; PRO-935; CYS-965; HIS-965; THR-997; LYS-1053; GLY-1055; TYR-1079; VAL-1113; THR-1140; ASN-1219; LYS-1225; HIS-1228; GLN-1232; TRP-1232; PRO-1239; ASN-1243; ASP-1249; GLY-1253; SER-1262; CYS-1271; ASN-1275; GLY-1288; PRO-1311; VAL-1319; GLY-1323; LEU-1332; LEU-1344; ILE-1346; PRO-1346; ARG-1351; MET-1353; TRP-1358; ASN-1359; CYS-1360; TYR-1363; ILE-1382; LEU-1405; MET-1405; ARG-1406; GLU-1406; ARG-1408; CYS-1409; PHE-1412; GLU-1419; ARG-1420; SER-1427; VAL-1428; GLY-1432; SER-1432; VAL-1433; LEU-1438; GLN-1441; LEU-1448; THR-1448; CYS-1449; ASP-1451; TYR-1463; PHE-1468; VAL-1501; LYS-1521; MET-1525; LYS-1548; CYS-1571; LYS-1574; PRO-1582; CYS-1583; HIS-1583; MET-1604; LEU-1613; MET-1620; GLN-1623; GLN-1629; GLU-1642; VAL-1660; ARG-1661; ILE-1667; TYR-1672; THR-1680; THR-1698; ARG-1709; MET-1709; SER-1712; GLY-1714; ASP-1722; ARG-1728; TRP-1728; ARG-1740; ARG-1743; GLU-1743; PHE-1764; MET-1779; LYS-1784; GLU-1832; ILE-1861; ASN-1872; LEU-1903; THR-1924; SER-1935; LYS-1938 AND VAL-2004;

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.