Paralogue Annotation for KCNQ1 residue 344

Residue details

Gene: KCNQ1
Reference Sequences: LRG: LRG_287, Ensembl variant: ENST00000155840 / ENSP00000155840
Amino Acid Position: 344
Reference Amino Acid: A - Alanine
Protein Domain: Transmembrane/Linker/Pore


Paralogue Variants mapped to KCNQ1 residue 344

ParalogueVariantAssociated DiseaseMapping QualityConsensusPubmed
KCNA1V404IEpisodic ataxia / myokymiaMedium9 9600245, 21307345, 25659636, 26944241
KCNQ2A309VEpileptic encephalopathy, early-onsetHigh9 23692823
KCNC3V535MSpinocerebellar ataxia 13Medium9 25756792, 25756792

To assess whether the paralogue annotation here confidently predicts that variation at this residue is pathogenic, it is important to check the reports in the Pubmed links above to ascertain that the mutations in these paralogues have been proved likely to be disease-causing. It is also important to check that the direction of effect of the variant in the paralogue is compatible with your observed phenotype in KCNQ1.



KCNQ1GYGDKVPQTWVGKTIASCFSVFAISFFALP>A<GILGSGFALKVQQKQRQKHFNRQIPA--AA372
KCNQ2GYGDKYPQTWNGRLLAATFTLIGVSFFALP>A<GILGSGFALKVQEQHRQKHFEKRRNP--AA337
KCNQ3GYGDKTPKTWEGRLIAATFSLIGVSFFALP>A<GILGSGLALKVQEQHRQKHFEKRRKP--AA376
KCNQ4GYGDKTPHTWLGRVLAAGFALLGISFFALP>A<GILGSGFALKVQEQHRQKHFEKRRMP--AA343
KCNQ5GYGDKTPLTWLGRLLSAGFALLGISFFALP>A<GILGSGFALKVQEQHRQKHFEKRRNP--AA371
KCNA1GYGDMYPVTIGGKIVGSLCAIAGVLTIALP>V<PVIVSNFNYFYHRETEGEEQAQLLH-----429
KCNA10GYGDMCPTTPGGKIVGTLCAIAGVLTIALP>V<PVIVSNFNYFYHRETENEEKQNIPGEIERI483
KCNA2GYGDMVPTTIGGKIVGSLCAIAGVLTIALP>V<PVIVSNFNYFYHRETEGEEQAQYLQ-----431
KCNA3GYGDMHPVTIGGKIVGSLCAIAGVLTIALP>V<PVIVSNFNYFYHRETEGEEQSQYMH-----501
KCNA4GYGDMKPITVGGKIVGSLCAIAGVLTIALP>V<PVIVSNFNYFYHRETENEEQTQLTQ-----581
KCNA5GYGDMRPITVGGKIVGSLCAIAGVLTIALP>V<PVIVSNFNYFYHRETDHEEPAVLKEE--QG540
KCNA6GYGDMYPMTVGGKIVGSLCAIAGVLTIALP>V<PVIVSNFNYFYHRETEQEEQGQYTHV----480
KCNA7GYGDMAPVTVGGKIVGSLCAIAGVLTISLP>V<PVIVSNFSYFYHRETEGEEAGMFSHV----416
KCNB1GYGDIYPKTLLGKIVGGLCCIAGVLVIALP>I<PIIVNNFSEFYKEQKRQEKAIKRREA--LE437
KCNB2GYGDIYPKTLLGKIVGGLCCIAGVLVIALP>I<PIIVNNFSEFYKEQKRQEKAIKRREA--LE441
KCNC1GYGDMYPQTWSGMLVGALCALAGVLTIAMP>V<PVIVNNFGMYYSLAMAKQKLPKKKKK--HI460
KCNC2GYGDMYPQTWSGMLVGALCALAGVLTIAMP>V<PVIVNNFGMYYSLAMAKQKLPRKRKK--HI497
KCNC3GYGDMYPKTWSGMLVGALCALAGVLTIAMP>V<PVIVNNFGMYYSLAMAKQKLPKKKNK--HI563
KCNC4GYGDMYPKTWSGMLVGALCALAGVLTIAMP>V<PVIVNNFGMYYSLAMAKQKLPKKRKK--HV496
KCND1GYGDMVPSTIAGKIFGSICSLSGVLVIALP>V<PVIVSNFSRIYHQNQRADKRRAQQKV--RL432
KCND2GYGDMVPKTIAGKIFGSICSLSGVLVIALP>V<PVIVSNFSRIYHQNQRADKRRAQKKA--RL430
KCND3GYGDMVPKTIAGKIFGSICSLSGVLVIALP>V<PVIVSNFSRIYHQNQRADKRRAQKKA--RL427
KCNF1GYGDIYPKTTLGKLNAAISFLCGVIAIALP>I<HPIINNFVRYYNKQRVLETAAKHELE--LM430
KCNG1GYGDMVPRSTPGQVVALSSILSGILLMAFP>V<TSIFHTFSRSYLELKQEQERVMFRRA--QF484
KCNG2GYGDMVPRSLPGQVVALSSILSGILLMAFP>V<TSIFHTFSRSYSELKEQQQRAASPEP--AL429
KCNG3GYGDMYPITVPGRILGGVCVVSGIVLLALP>I<TFIYHSFVQCYHELKFRSARYSR-------428
KCNG4GYGDMVPRSVPGQMVALSSILSGILIMAFP>A<TSIFHTFSHSYLELKKEQEQLQARLR--HL478
KCNS1GYGDVVPVTVAGKLAASGCILGGILVVALP>I<TIIFNKFSHFYRRQKALEAAVRNSNH--QE481
KCNS2GYGDVVPGTTAGKLTASACILAGILVVVLP>I<TLIFNKFSHFYRRQKQLESAMRSCDF--GD434
KCNS3GYGDTHPVTLAGKLIASTCIICGILVVALP>I<TIIFNKFSKYYQKQKDIDVDQCSEDA--PE430
KCNV1GYGDIRPDTTTGKIVAFMCILSGILVLALP>I<AIINDRFSACYFTLKLKEAAVRQREA--LK452
KCNV2GYGDMYPETHLGRFFAFLCIAFGIILNGMP>I<SILYNKFSDYYSKLKAYEYTTIRRER--GE517
cons                              > <                              

See full Alignment of Paralogues


Known Variants in KCNQ1

ProteinCDSDisease ClassificationDiseasedbSNP linksEffect Prediction
p.A344Ec.1031C>A Inherited ArrhythmiaLQTSSIFT: deleterious
Polyphen: probably damaging
ReportsInherited ArrhythmiaLQTS Mutation site-specific differences in arrhythmic risk and sensitivity to sympathetic stimulation in the LQT1 form of congenital long QT syndrome: multicenter study in Japan. J Am Coll Cardiol. 2004 44(1):117-25. 15234419
Inherited ArrhythmiaLQTS Compendium of cardiac channel mutations in 541 consecutive unrelated patients referred for long QT syndrome genetic testing. Heart Rhythm. 2005 2(5):507-17. 15840476
p.A344Vc.1031C>T Inherited ArrhythmiaLQTSSIFT: deleterious
Polyphen: probably damaging
ReportsInherited ArrhythmiaLQTS KVLQT1 C-terminal missense mutation causes a forme fruste long-QT syndrome. Circulation. 1997 96(9):2778-81. 9386136
Inherited ArrhythmiaLQTS Spectrum and frequency of cardiac channel defects in swimming-triggered arrhythmia syndromes. Circulation. 2004 110(15):2119-24. 15466642
Inherited ArrhythmiaLQTS Compendium of cardiac channel mutations in 541 consecutive unrelated patients referred for long QT syndrome genetic testing. Heart Rhythm. 2005 2(5):507-17. 15840476
Inherited ArrhythmiaLQTS Spectrum and prevalence of mutations from the first 2,500 consecutive unrelated patients referred for the FAMILION long QT syndrome genetic test. Heart Rhythm. 2009 6(9):1297-303. 19716085
Inherited ArrhythmiaLQTS New mutations in the KVLQT1 potassium channel that cause long-QT syndrome. Circulation. 1998 97(13):1264-9. 9570196
Inherited ArrhythmiaLQTS Clinical aspects of type-1 long-QT syndrome by location, coding type, and biophysical function of mutations involving the KCNQ1 gene. Circulation. 2007 115(19):2481-9. 17470695
p.Ala344Glyc.1031C>G UnknownSIFT:
Polyphen: