11-30011394-C-G

Position:

• chr11-30011394-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002233.4(KCNA4):​c.1285G>C​(p.Gly429Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00000658 in 152,058 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 0.0000066 (0 hom., cov: 32)
• Consequence: KCNA4 NM_002233.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.15

Genes affected

KCNA4 (HGNC:6222): (potassium voltage-gated channel subfamily A member 4) Potassium 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. Four sequence-related potassium channel genes - shaker, shaw, shab, and shal - have been identified in Drosophila, and each has been shown to have human homolog(s). This gene encodes a member of the potassium channel, voltage-gated, shaker-related subfamily. This member contains six membrane-spanning domains with a shaker-type repeat in the fourth segment. It belongs to the A-type potassium current class, the members of which may be important in the regulation of the fast repolarizing phase of action potentials in heart and thus may influence the duration of cardiac action potential.[provided by RefSeq, Mar 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2428259).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNA4	NM_002233.4	c.1285G>C	p.Gly429Arg	missense_variant	2/2	ENST00000328224.7	NP_002224.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNA4	ENST00000328224.7	c.1285G>C	p.Gly429Arg	missense_variant	2/2	1	NM_002233.4	ENSP00000328511.6

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 152058 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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

GnomAD4 exome Cov.: 32

GnomAD4 genome AF: 0.00000658 AC: 1 AN: 152058 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 74264

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 11, 2024

The c.1285G>C (p.G429R) alteration is located in exon 2 (coding exon 1) of the KCNA4 gene. This alteration results from a G to C substitution at nucleotide position 1285, causing the glycine (G) at amino acid position 429 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.25
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.020
CADD	Uncertain	23
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.64	D
Eigen	Benign	-0.11
Eigen_PC	Benign	0.12
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Benign	0.49	T
M_CAP	Benign	0.060	D
MetaRNN	Benign	0.24	T
MetaSVM	Uncertain	0.53	D
MutationAssessor	Benign	1.0	L
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-1.0	N
REVEL	Uncertain	0.41
Sift	Benign	0.096	T
Sift4G	Benign	0.36	T
Polyphen		0.029	B
Vest4		0.25
MutPred		0.44		Gain of solvent accessibility (P = 0.019);
MVP		0.81
MPC		0.59
ClinPred		0.47	T
GERP RS		5.4
Varity_R		0.11
gMVP		0.59

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: rs1850301765; hg19: chr11-30032941;