chr7-150947306-C-G

Variant names:

• chr7-150947306-C-G
• rs3815459
• NM_000238.4:c.3152+22G>C

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BS1 BS2

The NM_000238.4(KCNH2):​c.3152+22G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000202 in 1,531,080 control chromosomes in the GnomAD database, with no homozygous occurrence. 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 0.0011 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00011 (0 hom.)
• Consequence: KCNH2 NM_000238.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.37
• Publications: 25 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=-0.85).
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00108 (164/152030) while in subpopulation AFR AF = 0.0039 (162/41486). AF 95% confidence interval is 0.00341. There are 0 homozygotes in GnomAd4. There are 76 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High AC in GnomAd4 at 164 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNH2	NM_000238.4	c.3152+22G>C		intron_variant	Intron 13 of 14	ENST00000262186.10	NP_000229.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNH2	ENST00000262186.10	c.3152+22G>C		intron_variant	Intron 13 of 14	1	NM_000238.4	ENSP00000262186.5

Frequencies

GnomAD3 genomes AF: 0.00108 AC: 164 AN: 151912 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00392

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

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: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000274 AC: 37 AN: 135222 AF XY: 0.000177

Gnomad AFR exome AF: 0.00484

Gnomad AMR exome AF: 0.0000413

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000573

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000106 AC: 146 AN: 1379050 Hom.: 0 Cov.: 32 AF XY: 0.0000970 AC XY: 66 AN XY: 680522

African (AFR) AF: 0.00372 AC: 117 AN: 31452

American (AMR) AF: 0.0000564 AC: 2 AN: 35492

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24934

East Asian (EAS) AF: 0.00 AC: 0 AN: 35700

South Asian (SAS) AF: 0.0000127 AC: 1 AN: 78728

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 37178

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4822

European-Non Finnish (NFE) AF: 0.0000158 AC: 17 AN: 1073176

Other (OTH) AF: 0.000156 AC: 9 AN: 57568

GnomAD4 genome AF: 0.00108 AC: 164 AN: 152030 Hom.: 0 Cov.: 32 AF XY: 0.00102 AC XY: 76 AN XY: 74306

African (AFR) AF: 0.00390 AC: 162 AN: 41486

American (AMR) AF: 0.000131 AC: 2 AN: 15292

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5118

South Asian (SAS) AF: 0.00 AC: 0 AN: 4820

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10594

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67936

Other (OTH) AF: 0.00 AC: 0 AN: 2110

Alfa AF: 0.00000548 Hom.: 5668

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	0.12
DANN	Benign	0.63
PhyloP100		-1.4

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: rs3815459; hg19: chr7-150644394;