chr12-5044762-G-C

Variant names:

• chr12-5044762-G-C
• rs12720443
• NM_002234.4:c.615G>C

Variant summary

Our verdict is Benign. The variant received -10 ACMG points: 0P and 10B. BP4_Strong BP6 BP7 BS2

The NM_002234.4(KCNA5):​c.615G>C​(p.Leu205Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000833 in 1,614,162 control chromosomes in the GnomAD database, including 10 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. L205L) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0040 (5 hom., cov: 33)
  • Exomes 𝑓: 0.00050 (5 hom.)
• Consequence: KCNA5 NM_002234.4 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:3
• Conservation: PhyloP100: 1.76
• Publications: 2 publications found

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

ACMG classification

Our verdict: Benign. The variant received -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.51).
• BP6: Variant 12-5044762-G-C is Benign according to our data. Variant chr12-5044762-G-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 469596.
• BP7: Synonymous conserved (PhyloP=1.76 with no splicing effect.
• BS2: High AC in GnomAd4 at 607 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002234.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNA5	NM_002234.4	MANE Select	c.615G>C	p.Leu205Leu	synonymous	Exon 1 of 1	NP_002225.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNA5	ENST00000252321.5	TSL:6 MANE Select	c.615G>C	p.Leu205Leu	synonymous	Exon 1 of 1	ENSP00000252321.3	P22460-1

Frequencies

GnomAD3 genomes AF: 0.00399 AC: 607 AN: 152188 Hom.: 5 Cov.: 33

Gnomad AFR AF: 0.0138

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00124

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: 0.000118

Gnomad OTH AF: 0.00287

GnomAD2 exomes AF: 0.00124 AC: 311 AN: 251388 AF XY: 0.000802

Gnomad AFR exome AF: 0.0161

Gnomad AMR exome AF: 0.000954

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000114

Gnomad OTH exome AF: 0.000652

GnomAD4 exome AF: 0.000504 AC: 737 AN: 1461856 Hom.: 5 Cov.: 32 AF XY: 0.000470 AC XY: 342 AN XY: 727232

African (AFR) AF: 0.0158 AC: 530 AN: 33480

American (AMR) AF: 0.00116 AC: 52 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53384

Middle Eastern (MID) AF: 0.00295 AC: 17 AN: 5768

European-Non Finnish (NFE) AF: 0.0000531 AC: 59 AN: 1112012

Other (OTH) AF: 0.00129 AC: 78 AN: 60394

GnomAD4 genome AF: 0.00399 AC: 607 AN: 152306 Hom.: 5 Cov.: 33 AF XY: 0.00376 AC XY: 280 AN XY: 74468

African (AFR) AF: 0.0138 AC: 575 AN: 41572

American (AMR) AF: 0.00118 AC: 18 AN: 15310

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5166

South Asian (SAS) AF: 0.00 AC: 0 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10618

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.000118 AC: 8 AN: 68020

Other (OTH) AF: 0.00284 AC: 6 AN: 2114

Alfa AF: 0.00118 Hom.: 0

Bravo AF: 0.00461

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.000218

EpiControl AF: 0.000178

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	1	Atrial fibrillation, familial, 7 (2)
-	-	1	not provided (1)
-	-	1	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.51
CADD	Benign	1.5
DANN	Benign	0.70
PhyloP100		1.8
Mutation Taster		=99/1	polymorphism

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: rs12720443; hg19: chr12-5153928;