chr1-210920032-C-T

Variant names:

• chr1-210920032-C-T
• rs886041300
• NM_172362.3:c.1070G>A

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PM1 PM2 PM5 PP3_Moderate PP5_Very_Strong

The NM_172362.3(KCNH1):​c.1070G>A​(p.Arg357Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 13/22 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R357W) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KCNH1 NM_172362.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:17
• Conservation: PhyloP100: 7.60
• Publications: 14 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: Pathogenic. The variant received 16 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 1 uncertain in NM_172362.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-210920033-G-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 1493344.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.939
• PP5: Variant 1-210920032-C-T is Pathogenic according to our data. Variant chr1-210920032-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 279981.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

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.1070G>A	p.Arg357Gln	missense	Exon 7 of 11	NP_758872.1	O95259-1
	KCNH1	NM_002238.4		c.989G>A	p.Arg330Gln	missense	Exon 7 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.1070G>A	p.Arg357Gln	missense	Exon 7 of 11	ENSP00000271751.4	O95259-1
	KCNH1	ENST00000639952.1	TSL:1	c.989G>A	p.Arg330Gln	missense	Exon 7 of 11	ENSP00000492697.1	O95259-2
	KCNH1	ENST00000640044.1	TSL:1	c.311-115866G>A		intron	N/A	ENSP00000491434.1	A0A1W2PPA2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic/Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
5	-	-	not provided (5)
3	-	-	Temple-Baraitser syndrome (3)
3	-	-	Zimmermann-Laband syndrome 1 (3)
2	-	-	KCNH1-related disorder (2)
1	-	-	Inborn genetic diseases (1)
1	-	-	Intellectual disability (1)
1	-	-	Seizure (1)
1	-	-	Seizure;C0036857:severe intellectual disability;C0424503:Abnormal facial shape (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.39	D
BayesDel_noAF	Pathogenic	0.32
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.93	D
Eigen	Pathogenic	0.97
Eigen_PC	Pathogenic	0.91
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.88	D
MetaRNN	Pathogenic	0.94	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.6	H
PhyloP100		7.6
PrimateAI	Pathogenic	0.85	D
PROVEAN	Uncertain	-3.7	D
REVEL	Pathogenic	0.87
Sift	Uncertain	0.0080	D
Sift4G	Uncertain	0.016	D
Polyphen		1.0	D
Vest4		0.93
MutPred		0.77		Loss of sheet (P = 0.0063)
MVP		1.0
MPC		2.7
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.87
gMVP		0.98
Mutation Taster		=8/92	disease causing (ClinVar)

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: rs886041300; hg19: chr1-211093374;