rs1934636

Variant names:

• chr1-210756551-C-A
• rs1934636
• NM_172362.3:c.2112+18797G>T

Variant summary

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

The NM_172362.3(KCNH1):​c.2112+18797G>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.826 in 152,178 control chromosomes in the GnomAD database, including 51,991 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 0.83 (51991 hom., cov: 32)
• Consequence: KCNH1 NM_172362.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.204
• Publications: 1 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: ClinGen, Illumina
• Temple-Baraitser syndrome

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet, G2P
• 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: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.86 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNH1	NM_172362.3	c.2112+18797G>T		intron_variant	Intron 10 of 10	ENST00000271751.10	NP_758872.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNH1	ENST00000271751.10	c.2112+18797G>T		intron_variant	Intron 10 of 10	2	NM_172362.3	ENSP00000271751.4

Frequencies

GnomAD3 genomes AF: 0.826 AC: 125642 AN: 152060 Hom.: 51945 Cov.: 32

Gnomad AFR AF: 0.845

Gnomad AMI AF: 0.868

Gnomad AMR AF: 0.820

Gnomad ASJ AF: 0.848

Gnomad EAS AF: 0.881

Gnomad SAS AF: 0.877

Gnomad FIN AF: 0.773

Gnomad MID AF: 0.829

Gnomad NFE AF: 0.815

Gnomad OTH AF: 0.823

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

GnomAD4 genome AF: 0.826 AC: 125745 AN: 152178 Hom.: 51991 Cov.: 32 AF XY: 0.826 AC XY: 61444 AN XY: 74384

African (AFR) AF: 0.845 AC: 35071 AN: 41512

American (AMR) AF: 0.820 AC: 12544 AN: 15290

Ashkenazi Jewish (ASJ) AF: 0.848 AC: 2944 AN: 3472

East Asian (EAS) AF: 0.881 AC: 4565 AN: 5182

South Asian (SAS) AF: 0.877 AC: 4230 AN: 4822

European-Finnish (FIN) AF: 0.773 AC: 8189 AN: 10592

Middle Eastern (MID) AF: 0.820 AC: 241 AN: 294

European-Non Finnish (NFE) AF: 0.815 AC: 55438 AN: 67996

Other (OTH) AF: 0.822 AC: 1731 AN: 2106

Alfa AF: 0.822 Hom.: 80190

Bravo AF: 0.831

Asia WGS AF: 0.855 AC: 2973 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
CADD	Benign	1.2
DANN	Benign	0.65
PhyloP100		-0.20
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: rs1934636; hg19: chr1-210929893;