ClinVar Genomic variation as it relates to human health
NM_000238.4(KCNH2):c.56T>C (p.Ile19Thr)
The aggregate germline classification for this variant, typically for a monogenic or Mendelian disorder as in the ACMG/AMP guidelines, or for response to a drug. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the aggregate classification.
Stars represent the aggregate review status, or the level of review supporting the aggregate germline classification for this VCV record. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the review status. The number of submissions which contribute to this review status is shown in parentheses.
No data submitted for somatic clinical impact
No data submitted for oncogenicity
Variant Details
- Identifiers
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NM_000238.4(KCNH2):c.56T>C (p.Ile19Thr)
Variation ID: 3255226 Accession: VCV003255226.1
- Type and length
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single nucleotide variant, 1 bp
- Location
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Cytogenetic: 7q36.1 7: 150977858 (GRCh38) [ NCBI UCSC ] 7: 150674946 (GRCh37) [ NCBI UCSC ]
- Timeline in ClinVar
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First in ClinVar Help The date this variant first appeared in ClinVar with each type of classification.
Last submission Help The date of the most recent submission for each type of classification for this variant.
Last evaluated Help The most recent date that a submitter evaluated this variant for each type of classification.
Germline Jul 23, 2024 Jul 23, 2024 Jul 17, 2023 - HGVS
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Nucleotide Protein Molecular
consequenceNM_000238.4:c.56T>C MANE Select Help Transcripts from the Matched Annotation from the NCBI and EMBL-EBI (MANE) collaboration.
NP_000229.1:p.Ile19Thr missense NM_172056.3:c.56T>C NP_742053.1:p.Ile19Thr missense NR_176254.1:n.464T>C non-coding transcript variant NC_000007.14:g.150977858A>G NC_000007.13:g.150674946A>G NG_008916.1:g.5069T>C LRG_288:g.5069T>C LRG_288t1:c.56T>C LRG_288p1:p.Ile19Thr LRG_288t2:c.56T>C LRG_288p2:p.Ile19Thr - Protein change
- I19T
- Other names
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- Canonical SPDI
- NC_000007.14:150977857:A:G
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Functional
consequence HelpThe effect of the variant on RNA or protein function, based on experimental evidence from submitters.
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Global minor allele
frequency (GMAF) HelpThe global minor allele frequency calculated by the 1000 Genomes Project. The minor allele at this location is indicated in parentheses and may be different from the allele represented by this VCV record.
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Allele frequency
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The frequency of the allele represented by this VCV record.
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- Links
Genes
Gene | OMIM | ClinGen Gene Dosage Sensitivity Curation |
Variation Viewer
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Links to Variation Viewer, a genome browser to view variation data from NCBI databases. |
Related variants | ||
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HI score
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The haploinsufficiency score for the gene, curated by ClinGen’s Dosage Sensitivity Curation task team. |
TS score
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The triplosensitivity score for the gene, curated by ClinGen’s Dosage Sensitivity Curation task team. |
Within gene
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The number of variants in ClinVar that are contained within this gene, with a link to view the list of variants. |
All
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The number of variants in ClinVar for this gene, including smaller variants within the gene and larger CNVs that overlap or fully contain the gene. |
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KCNH2 | Sufficient evidence for dosage pathogenicity | No evidence available |
GRCh38 GRCh37 |
3230 | 3316 |
Conditions - Germline
Condition
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The condition for this variant-condition (RCV) record in ClinVar. |
Classification
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The aggregate germline classification for this variant-condition (RCV) record in ClinVar. The number of submissions that contribute to this aggregate classification is shown in parentheses. (# of submissions) |
Review status
Help
The aggregate review status for this variant-condition (RCV) record in ClinVar. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the review status. |
Last evaluated
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The most recent date that a submitter evaluated this variant for the condition. |
Variation/condition record
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The RCV accession number, with most recent version number, for the variant-condition record, with a link to the RCV web page. |
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Uncertain significance (1) |
criteria provided, single submitter
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Jul 17, 2023 | RCV004595409.1 |
Submissions - Germline
Classification
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The submitted germline classification for each SCV record. (Last evaluated) |
Review status
Help
Stars represent the review status, or the level of review supporting the submitted (SCV) record. This value is calculated by NCBI based on data from the submitter. Read our rules for calculating the review status. This column also includes a link to the submitter’s assertion criteria if provided, and the collection method. (Assertion criteria) |
Condition
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The condition for the classification, provided by the submitter for this submitted (SCV) record. This column also includes the affected status and allele origin of individuals observed with this variant. |
Submitter
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The submitting organization for this submitted (SCV) record. This column also includes the SCV accession and version number, the date this SCV first appeared in ClinVar, and the date that this SCV was last updated in ClinVar. |
More information
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This column includes more information supporting the classification, including citations, the comment on classification, and detailed evidence provided as observations of the variant by the submitter. |
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Uncertain significance
(Jul 17, 2023)
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criteria provided, single submitter
Method: clinical testing
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Long QT syndrome 2
(Autosomal dominant inheritance)
Affected status: yes
Allele origin:
germline
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Victorian Clinical Genetics Services, Murdoch Childrens Research Institute
Additional submitter:
Shariant Australia, Australian Genomics
Accession: SCV005086703.1
First in ClinVar: Jul 23, 2024 Last updated: Jul 23, 2024 |
Comment:
Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as VUS-3A. Following criteria are met: 0103 - Dominant negative and loss of function are … (more)
Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as VUS-3A. Following criteria are met: 0103 - Dominant negative and loss of function are known mechanisms of disease in this gene and are associated with long QT syndrome 2 (MIM#613688). Gain of function is also a known mechanism associated with short QT syndrome 1 (MIM#609620) (OMIM, PMIDs: 10753933, 21777565). (I) 0107 - This gene is associated with autosomal dominant disease. (I) 0112 - The condition associated with this gene has incomplete penetrance (PMID: 20301308). (I) 0200 - Variant is predicted to result in a missense amino acid change from isoleucine to threonine. (I) 0251 - This variant is heterozygous. (I) 0301 - Variant is absent from gnomAD (both v2 and v3). (SP) 0501 - Missense variant consistently predicted to be damaging by multiple in silico tools but uninformative conservation with a moderate amino acid change. (SP) 0604 - Variant is not located in an established domain, motif, hotspot or informative constraint region. (I) 0708 - Another missense variant comparable to the one identified in this case has conflicting previous evidence for pathogenicity. p.(Ile19Phe) has been detected in individuals with LQTS (ClinVar, PMIDs: 32893267, 31520628). It has been reported as a VUS in ClinVar in a family with segregation evidence (personal communication). However, a study utilising an adapted version of the ACMG guidelines, has regarded it as likely pathogenic (PMID: 32893267). (I) 0808 - Previous reports of pathogenicity for this variant are conflicting. It has been detected in at least two families with LQTS and regarded as a VUS, including a de novo occurrence in an individual with LQTS who also harbours a variant of uncertain significance with potential clinical relevance (VUS-3A) in KCNQ1 (PMID: 26669661; LOVD; VCGS cohort). A study utilising an adapted version of the ACMG guidelines, has regarded it as likely pathogenic (PMID: 32893267). (I) 0905 - No published segregation evidence has been identified for this variant. This variant has been reported in a family; however, no sufficient information was provided to inform segregation (PMID: 26669661; LOVD). (I) 1007 - No published functional evidence has been identified for this variant. (I) 1208 - Inheritance information for this variant is not currently available in this individual. (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign (less)
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Germline Functional Evidence
There is no functional evidence in ClinVar for this variation. If you have generated functional data for this variation, please consider submitting that data to ClinVar. |
Citations for germline classification of this variant
HelpTitle | Author | Journal | Year | Link |
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Long QT Syndrome Overview. | Adam MP | - | 2024 | PMID: 20301308 |
Enhancing rare variant interpretation in inherited arrhythmias through quantitative analysis of consortium disease cohorts and population controls. | Walsh R | Genetics in medicine : official journal of the American College of Medical Genetics | 2021 | PMID: 32893267 |
Mothers with long QT syndrome are at increased risk for fetal death: findings from a multicenter international study. | Cuneo BF | American journal of obstetrics and gynecology | 2020 | PMID: 31520628 |
Asymmetry of parental origin in long QT syndrome: preferential maternal transmission of KCNQ1 variants linked to channel dysfunction. | Itoh H | European journal of human genetics : EJHG | 2016 | PMID: 26669661 |
Role of the cytoplasmic N-terminal Cap and Per-Arnt-Sim (PAS) domain in trafficking and stabilization of Kv11.1 channels. | Ke Y | The Journal of biological chemistry | 2014 | PMID: 24695734 |
The hERG K(+) channel S4 domain L532P mutation: characterization at 37°C. | Zhang YH | Biochimica et biophysica acta | 2011 | PMID: 21777565 |
The N-terminal tail of hERG contains an amphipathic α-helix that regulates channel deactivation. | Ng CA | PloS one | 2011 | PMID: 21249148 |
The dominant negative LQT2 mutation A561V reduces wild-type HERG expression. | Kagan A | The Journal of biological chemistry | 2000 | PMID: 10753933 |
Text-mined citations for this variant ...
HelpRecord last updated Aug 04, 2024
This date represents the last time this VCV record was updated. The update may be due to an update to one of the included submitted records (SCVs), or due to an update that ClinVar made to the variant such as adding HGVS expressions or a rs number. So this date may be different from the date of the “most recent submission” reported at the top of this page.