rs17215402

Positions:

• chr12-5045076-C-G
• chr12-5045076-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_002234.4(KCNA5):​c.929C>G​(p.Pro310Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 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. P310L) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KCNA5 NM_002234.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.17

Genes affected

KCNA5 (HGNC:6224): (potassium voltage-gated channel subfamily A member 5) Potassium channels represent the most complex class of voltage-gated ino 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 delayed rectifier class, the function of which could restore the resting membrane potential of beta cells after depolarization and thereby contribute to the regulation of insulin secretion. This gene is intronless, and the gene is clustered with genes KCNA1 and KCNA6 on chromosome 12. Defects in this gene are a cause of familial atrial fibrillation type 7 (ATFB7). [provided by RefSeq, May 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.27255866).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNA5	NM_002234.4	c.929C>G	p.Pro310Arg	missense_variant	1/1	ENST00000252321.5	NP_002225.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNA5	ENST00000252321.5	c.929C>G	p.Pro310Arg	missense_variant	1/1		NM_002234.4	ENSP00000252321	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.084
BayesDel_addAF	Uncertain	0.14	D
BayesDel_noAF	Uncertain	-0.030
CADD	Benign	18
DANN	Benign	0.91
DEOGEN2	Uncertain	0.52	D
Eigen	Benign	-0.43
Eigen_PC	Benign	-0.37
FATHMM_MKL	Benign	0.64	D
LIST_S2	Benign	0.54	T
M_CAP	Uncertain	0.21	D
MetaRNN	Benign	0.27	T
MetaSVM	Uncertain	-0.0022	T
MutationAssessor	Benign	1.2	L
MutationTaster	Benign	0.89	N
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-0.72	N
REVEL	Uncertain	0.42
Sift	Benign	0.040	D
Sift4G	Benign	0.32	T
Polyphen		0.083	B
Vest4		0.32
MutPred		0.27		Loss of glycosylation at P310 (P = 0.0185);
MVP		1.0
MPC		1.0
ClinPred		0.41	T
GERP RS		4.8
Varity_R		0.17
gMVP		0.76

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: rs17215402; hg19: chr12-5154242;