ClinVar Miner

Submissions for variant NM_000238.4(KCNH2):c.2477C>T (p.Thr826Ile)

dbSNP: rs199473002
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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
GeneDx RCV000181868 SCV000234171 pathogenic not provided 2013-06-12 criteria provided, single submitter clinical testing The Thr826Ile mutation in the KCNH2 gene has been reported in one Japanese patient with a suspected diagnosis of congenital LQTS, and it was absent from 200 Japanese control individuals (Itoh H et al., 2010). Thr826Ile results in a non-conservative amino acid substitution of a neutral, polar Threonine with a non-polar Isoleucine at a position that is conserved across species. Mutations in nearby residues (Val822Met, Arg823Trp, Arg835Trp) have been reported in association with LQTS, further supporting the functional importance of this region of the protein. Furthermore, the Thr826Ile mutation was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The variant is found in LQT panel(s).
Cardiovascular Biomedical Research Unit, Royal Brompton & Harefield NHS Foundation Trust RCV000058127 SCV000089647 not provided Congenital long QT syndrome no assertion provided literature only This variant has been reported as associated with Long QT syndrome in the following publications (PMID:20541041). This is a literature report, and does not necessarily reflect the clinical interpretation of the Imperial College / Royal Brompton Cardiovascular Genetics laboratory.

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