7-150947460-C-T

Variant names:

• chr7-150947460-C-T
• rs199473542
• NM_000238.4:c.3020G>A

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 1P and 6B. PP2 BP4_Moderate BS2

The NM_000238.4(KCNH2):​c.3020G>A​(p.Arg1007His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000401 in 1,569,204 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1007C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000042 (0 hom.)
• Consequence: KCNH2 NM_000238.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:5 O:1
• Conservation: PhyloP100: 0.523
• Publications: 6 publications found

Genes affected

KCNH2 (HGNC:6251): (potassium voltage-gated channel subfamily H member 2) This gene encodes a component of a voltage-activated potassium channel found in cardiac muscle, nerve cells, and microglia. Four copies of this protein interact with one copy of the KCNE2 protein to form a functional potassium channel. Mutations in this gene can cause long QT syndrome type 2 (LQT2). Transcript variants encoding distinct isoforms have been identified. [provided by RefSeq, May 2022]

KCNH2 Gene-Disease associations (from GenCC):

• long QT syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• long QT syndrome 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• short QT syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• short QT syndrome type 1

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• Brugada syndrome

  Inheritance: AD Classification: MODERATE, NO_KNOWN Submitted by: ClinGen, Genomics England PanelApp

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 158 curated pathogenic missense variants (we use a threshold of 10). The gene has 38 curated benign missense variants. Gene score misZ: 3.3724 (above the threshold of 3.09). Trascript score misZ: 2.4846 (below the threshold of 3.09). GenCC associations: The gene is linked to long QT syndrome 2, short QT syndrome type 1, short QT syndrome, Brugada syndrome, long QT syndrome.
• BP4: Computational evidence support a benign effect (MetaRNN=0.24016601).
• BS2: High AC in GnomAdExome4 at 60 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000238.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNH2	NM_000238.4	MANE Select	c.3020G>A	p.Arg1007His	missense	Exon 13 of 15	NP_000229.1	A0A090N8Q0
	KCNH2	NM_001406753.1		c.2732G>A	p.Arg911His	missense	Exon 11 of 13	NP_001393682.1	Q12809-7
	KCNH2	NM_172057.3		c.2000G>A	p.Arg667His	missense	Exon 9 of 11	NP_742054.1	Q12809-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNH2	ENST00000262186.10	TSL:1 MANE Select	c.3020G>A	p.Arg1007His	missense	Exon 13 of 15	ENSP00000262186.5	Q12809-1
	KCNH2	ENST00000330883.9	TSL:1	c.2000G>A	p.Arg667His	missense	Exon 9 of 11	ENSP00000328531.4	Q12809-2
	KCNH2	ENST00000713710.1		c.2954G>A	p.Arg985His	missense	Exon 13 of 15	ENSP00000519013.1	A0AAQ5BGR0

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152140 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000171 AC: 3 AN: 175118 AF XY: 0.0000211

Gnomad AFR exome AF: 0.000107

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000276

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000423 AC: 60 AN: 1417064 Hom.: 0 Cov.: 36 AF XY: 0.0000457 AC XY: 32 AN XY: 700532

African (AFR) AF: 0.0000609 AC: 2 AN: 32846

American (AMR) AF: 0.00 AC: 0 AN: 37156

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25308

East Asian (EAS) AF: 0.00 AC: 0 AN: 37816

South Asian (SAS) AF: 0.00 AC: 0 AN: 80734

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48940

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5686

European-Non Finnish (NFE) AF: 0.0000514 AC: 56 AN: 1089814

Other (OTH) AF: 0.0000340 AC: 2 AN: 58764

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152140 Hom.: 0 Cov.: 33 AF XY: 0.0000135 AC XY: 1 AN XY: 74322

African (AFR) AF: 0.0000483 AC: 2 AN: 41430

American (AMR) AF: 0.00 AC: 0 AN: 15278

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5178

South Asian (SAS) AF: 0.00 AC: 0 AN: 4834

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10626

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68002

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000264

ExAC AF: 0.0000172 AC: 2

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	2	-	Long QT syndrome (2)
-	1	-	Cardiac arrhythmia (1)
-	1	-	not provided (1)
-	1	-	Short QT syndrome type 1;C3150943:Long QT syndrome 2 (1)
-	-	-	Congenital long QT syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.083
CardioboostArm	Benign	0.00026
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.11
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.34	T
Eigen	Benign	-0.74
Eigen_PC	Benign	-0.61
FATHMM_MKL	Benign	0.38	N
LIST_S2	Uncertain	0.87	D
M_CAP	Pathogenic	0.76	D
MetaRNN	Benign	0.24	T
MetaSVM	Uncertain	0.23	D
MutationAssessor	Benign	0.0	N
PhyloP100		0.52
PrimateAI	Uncertain	0.55	T
PROVEAN	Benign	-0.37	N
REVEL	Uncertain	0.56
Sift	Benign	0.23	T
Sift4G	Benign	0.14	T
Polyphen		0.0030	B
Vest4		0.26
MVP		0.99
MPC		0.21
ClinPred		0.32	T
GERP RS		2.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.046
gMVP		0.52
Mutation Taster		=6/94	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs199473542; hg19: chr7-150644548;