Genetic Variant KCNA5:p.Cys36Arg (chr12-5044253-T-C) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 2P and 6B. PM2BP4_ModerateBS2

The NM_002234.4(KCNA5):c.106T>C(p.Cys36Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000036 in 1,388,128 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict 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. C36S) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000036 ( 0 hom. )

Consequence

KCNA5
NM_002234.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.0270

Publications

0 publications found

Variant links:

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]

KCNA5 Gene-Disease associations (from GenCC):

atrial fibrillation, familial, 7
Inheritance: AD Classification: MODERATE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
familial atrial fibrillation
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

KCNA5 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.09284887).

BS2

High AC in GnomAdExome4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNA5	NM_002234.4 link	c.106T>C	p.Cys36Arg	missense_variant	Exon 1 of 1	ENST00000252321.5	NP_002225.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNA5	ENST00000252321.5 link	c.106T>C	p.Cys36Arg	missense_variant	Exon 1 of 1	6	NM_002234.4	ENSP00000252321.3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000360

AC:

AN:

1388128

Hom.:

Cov.:

AF XY:

0.00000292

AC XY:

AN XY:

685382

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31870

American (AMR)

AF:

0.00

AC:

AN:

35868

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25150

East Asian (EAS)

AF:

0.00

AC:

AN:

36192

South Asian (SAS)

AF:

0.00

AC:

AN:

79378

European-Finnish (FIN)

AF:

0.00

AC:

AN:

36394

Middle Eastern (MID)

AF:

0.000205

AC:

AN:

4872

European-Non Finnish (NFE)

AF:

0.00000370

AC:

AN:

1080486

Other (OTH)

AF:

0.00

AC:

AN:

57918

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.465

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

Asia WGS

AF:

0.000289

AC:

AN:

3476

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.083

BayesDel_addAF

Benign

0.0061

BayesDel_noAF

Benign

-0.23

CADD

Benign

(source)

DANN

Benign

0.70

DEOGEN2

Benign

0.19

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.0

LIST_S2

Benign

0.35

M_CAP

Uncertain

0.17

MetaRNN

Benign

0.093

MetaSVM

Uncertain

0.12

MutationAssessor

Benign

0.55

PhyloP100

0.027

PrimateAI

Uncertain

0.71

PROVEAN

Benign

-0.10

Sift

Benign

0.23

Sift4G

Benign

0.20

Vest4

0.15

ClinPred

0.081

GERP RS

-1.1

PromoterAI

0.018

Neutral

(source)

Varity_R

0.53

gMVP

0.33

Mutation Taster

=90/10

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over