1-210683301-C-T

Variant names:

• chr1-210683301-C-T
• rs374239901
• NM_172362.3:c.2950G>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_172362.3(KCNH1):​c.2950G>A​(p.Asp984Asn) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,040 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D984E) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: KCNH1 NM_172362.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.88
• Publications: 0 publications found

Genes affected

KCNH1 (HGNC:6250): (potassium voltage-gated channel subfamily H member 1) Voltage-gated potassium (Kv) channels represent the most complex class of voltage-gated ion channels from both functional and structural standpoints. Their diverse functions include regulating neurotransmitter release, heart rate, insulin secretion, neuronal excitability, epithelial electrolyte transport, smooth muscle contraction, and cell volume. This gene encodes a member of the potassium channel, voltage-gated, subfamily H. This member is a pore-forming (alpha) subunit of a voltage-gated non-inactivating delayed rectifier potassium channel. It is activated at the onset of myoblast differentiation. The gene is highly expressed in brain and in myoblasts. Overexpression of the gene may confer a growth advantage to cancer cells and favor tumor cell proliferation. Alternative splicing of this gene results in two transcript variants encoding distinct isoforms. [provided by RefSeq, Jul 2008]

KCNH1 Gene-Disease associations (from GenCC):

• KCNH1 associated disorder

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Illumina, ClinGen
• Temple-Baraitser syndrome

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics
• Zimmermann-Laband syndrome 1

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• Zimmermann-Laband syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_172362.3. 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
	KCNH1	NM_172362.3	MANE Select	c.2950G>A	p.Asp984Asn	missense	Exon 11 of 11	NP_758872.1	O95259-1
	KCNH1	NM_002238.4		c.2869G>A	p.Asp957Asn	missense	Exon 11 of 11	NP_002229.1	O95259-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNH1	ENST00000271751.10	TSL:2 MANE Select	c.2950G>A	p.Asp984Asn	missense	Exon 11 of 11	ENSP00000271751.4	O95259-1
	KCNH1	ENST00000639952.1	TSL:1	c.2869G>A	p.Asp957Asn	missense	Exon 11 of 11	ENSP00000492697.1	O95259-2
	KCNH1	ENST00000640044.1	TSL:1	c.1798G>A	p.Asp600Asn	missense	Exon 7 of 7	ENSP00000491434.1	A0A1W2PPA2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461040 Hom.: 0 Cov.: 36 AF XY: 0.00000138 AC XY: 1 AN XY: 726776

African (AFR) AF: 0.00 AC: 0 AN: 33356

American (AMR) AF: 0.00 AC: 0 AN: 44596

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26128

East Asian (EAS) AF: 0.00 AC: 0 AN: 39694

South Asian (SAS) AF: 0.00 AC: 0 AN: 86172

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53384

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 9.00e-7 AC: 1 AN: 1111608

Other (OTH) AF: 0.00 AC: 0 AN: 60336

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Uncertain	0.048	T
BayesDel_noAF	Benign	-0.17
CADD	Uncertain	24
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.31	T
Eigen	Uncertain	0.48
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.93	D
M_CAP	Pathogenic	0.87	D
MetaRNN	Uncertain	0.53	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Benign	1.9	L
PhyloP100		5.9
PrimateAI	Uncertain	0.63	T
PROVEAN	Benign	-1.5	N
REVEL	Uncertain	0.49
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.010	D
Polyphen		0.80	P
Vest4		0.17
MutPred		0.19		Loss of stability (P = 0.1231)
MVP		0.96
MPC		0.54
ClinPred		0.97	D
GERP RS		5.1
Varity_R		0.30
gMVP		0.35
Mutation Taster		=49/51	disease causing

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: rs374239901; hg19: chr1-210856643;