chr7-150970122-C-T

Variant names:

• chr7-150970122-C-T
• rs3807375
• NM_000238.4:c.307+4589G>A

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000238.4(KCNH2):​c.307+4589G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.494 in 151,972 control chromosomes in the GnomAD database, including 20,473 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.49 (20473 hom., cov: 31)
• Consequence: KCNH2 NM_000238.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0530
• Publications: 61 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), Ambry Genetics, G2P
• short QT syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• 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: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.95).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.758 is higher than 0.05.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNH2	NM_000238.4	MANE Select	c.307+4589G>A		intron	N/A	NP_000229.1
	KCNH2	NM_172056.3		c.307+4589G>A		intron	N/A	NP_742053.1
	KCNH2	NM_001406755.1		c.130+4589G>A		intron	N/A	NP_001393684.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNH2	ENST00000262186.10	TSL:1 MANE Select	c.307+4589G>A		intron	N/A	ENSP00000262186.5
	KCNH2	ENST00000713710.1		c.307+4589G>A		intron	N/A	ENSP00000519013.1
	KCNH2	ENST00000713701.1		c.7+4248G>A		intron	N/A	ENSP00000519004.1

Frequencies

GnomAD3 genomes AF: 0.494 AC: 74983 AN: 151854 Hom.: 20424 Cov.: 31

Gnomad AFR AF: 0.706

Gnomad AMI AF: 0.357

Gnomad AMR AF: 0.510

Gnomad ASJ AF: 0.380

Gnomad EAS AF: 0.778

Gnomad SAS AF: 0.411

Gnomad FIN AF: 0.456

Gnomad MID AF: 0.424

Gnomad NFE AF: 0.360

Gnomad OTH AF: 0.459

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.494 AC: 75093 AN: 151972 Hom.: 20473 Cov.: 31 AF XY: 0.499 AC XY: 37096 AN XY: 74292

African (AFR) AF: 0.706 AC: 29253 AN: 41458

American (AMR) AF: 0.511 AC: 7801 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.380 AC: 1318 AN: 3468

East Asian (EAS) AF: 0.778 AC: 4004 AN: 5148

South Asian (SAS) AF: 0.413 AC: 1986 AN: 4814

European-Finnish (FIN) AF: 0.456 AC: 4821 AN: 10564

Middle Eastern (MID) AF: 0.415 AC: 122 AN: 294

European-Non Finnish (NFE) AF: 0.360 AC: 24483 AN: 67938

Other (OTH) AF: 0.465 AC: 982 AN: 2110

Alfa AF: 0.415 Hom.: 48894

Bravo AF: 0.514

Asia WGS AF: 0.590 AC: 2049 AN: 3476

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.95
CADD	Benign	2.6
DANN	Benign	0.71
PhyloP100		-0.053
Mutation Taster		=100/0	polymorphism (auto)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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: rs3807375; hg19: chr7-150667210;