chr8-72866407-G-A

Variant names:

• chr8-72866407-G-A
• rs10504543
• NM_004770.3:c.580-69528G>A

Variant summary

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

The NM_004770.3(KCNB2):​c.580-69528G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.382 in 152,078 control chromosomes in the GnomAD database, including 11,348 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 0.38 (11348 hom., cov: 33)
• Consequence: KCNB2 NM_004770.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.242
• Publications: 14 publications found

Genes affected

KCNB2 (HGNC:6232): (potassium voltage-gated channel subfamily B member 2) 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. 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, shab-related subfamily. This member is a delayed rectifier potassium channel. The gene is expressed in gastrointestinal smooth muscle cells. [provided by RefSeq, Jul 2008]

KCNB2 Gene-Disease associations (from GenCC):

• neurodevelopmental disorder

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.96).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.417 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNB2	NM_004770.3	c.580-69528G>A		intron_variant	Intron 2 of 2	ENST00000523207.2	NP_004761.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNB2	ENST00000523207.2	c.580-69528G>A		intron_variant	Intron 2 of 2	1	NM_004770.3	ENSP00000430846.1

Frequencies

GnomAD3 genomes AF: 0.382 AC: 58117 AN: 151960 Hom.: 11342 Cov.: 33

Gnomad AFR AF: 0.348

Gnomad AMI AF: 0.424

Gnomad AMR AF: 0.409

Gnomad ASJ AF: 0.363

Gnomad EAS AF: 0.225

Gnomad SAS AF: 0.303

Gnomad FIN AF: 0.345

Gnomad MID AF: 0.402

Gnomad NFE AF: 0.421

Gnomad OTH AF: 0.398

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

GnomAD4 genome AF: 0.382 AC: 58150 AN: 152078 Hom.: 11348 Cov.: 33 AF XY: 0.376 AC XY: 27940 AN XY: 74340

African (AFR) AF: 0.348 AC: 14426 AN: 41474

American (AMR) AF: 0.409 AC: 6249 AN: 15274

Ashkenazi Jewish (ASJ) AF: 0.363 AC: 1258 AN: 3470

East Asian (EAS) AF: 0.225 AC: 1168 AN: 5182

South Asian (SAS) AF: 0.302 AC: 1458 AN: 4822

European-Finnish (FIN) AF: 0.345 AC: 3649 AN: 10578

Middle Eastern (MID) AF: 0.391 AC: 115 AN: 294

European-Non Finnish (NFE) AF: 0.421 AC: 28595 AN: 67964

Other (OTH) AF: 0.401 AC: 847 AN: 2112

Alfa AF: 0.408 Hom.: 46986

Bravo AF: 0.391

Asia WGS AF: 0.326 AC: 1132 AN: 3476

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.96
CADD	Benign	1.9
DANN	Benign	0.74
PhyloP100		-0.24
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: rs10504543; hg19: chr8-73778642;