1-210919955-C-G

Position:

• chr1-210919955-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP2 PP5

The NM_172362.3(KCNH1):​c.1147G>C​(p.Val383Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: KCNH1 NM_172362.3 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 7.60

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), KCNH1. . Gene score misZ: 3.8156 (greater than the threshold 3.09). Trascript score misZ: 5.0674 (greater than threshold 3.09). The gene has 27 curated pathogenic missense variants (we use a threshold of 10). The gene has 72 curated benign missense variants. GenCC has associacion of the gene with KCNH1 associated disorder, Zimmermann-Laband syndrome, Temple-Baraitser syndrome, Zimmermann-Laband syndrome 1.
• PP5: Variant 1-210919955-C-G is Pathogenic according to our data. Variant chr1-210919955-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 183417.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNH1	NM_172362.3	c.1147G>C	p.Val383Leu	missense_variant	7/11	ENST00000271751.10	NP_758872.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNH1	ENST00000271751.10	c.1147G>C	p.Val383Leu	missense_variant	7/11	2	NM_172362.3	ENSP00000271751.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Zimmermann-Laband syndrome 1 Pathogenic:1

Pathogenic, no assertion criteria provided

not provided

Reparto di Fisiopatologia delle Malattie Genetiche, Dipartimento di Ematologia, Oncologia; Istituto Superiore di Sanità

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.87
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.26
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.50	.;.;T;.;.
Eigen	Benign	0.14
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	D;D;D;.;D
M_CAP	Uncertain	0.25	D
MetaRNN	Uncertain	0.72	D;D;D;D;D
MetaSVM	Uncertain	0.72	D
MutationAssessor	Benign	1.4	.;.;L;.;.
PrimateAI	Pathogenic	0.85	D
PROVEAN	Benign	0.030	N;.;N;.;.
REVEL	Uncertain	0.61
Sift	Benign	0.53	T;.;T;.;.
Sift4G	Benign	0.71	T;.;T;.;.
Polyphen		0.31	.;.;B;.;.
Vest4		0.83
MutPred		0.65		.;Loss of catalytic residue at V383 (P = 0.0968);Loss of catalytic residue at V383 (P = 0.0968);.;.;
MVP		0.98
MPC		1.9
ClinPred		0.92	D
GERP RS		5.8
Varity_R		0.28
gMVP		0.85

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

Publications

LitVar

Other links and lift over

dbSNP: rs730882173; hg19: chr1-211093297;