rs314156

chr5-170378407-T-C

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_004137.4(KCNMB1):c.*297A>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.115 in 335,132 control chromosomes in the GnomAD database, including 2,813 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 0.14 (1699 hom., cov: 32)
  • Exomes 𝑓: 0.098 (1114 hom.)
• Consequence: KCNMB1 NM_004137.4 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.71

Genes affected

KCNMB1 (HGNC:6285): (potassium calcium-activated channel subfamily M regulatory beta subunit 1) MaxiK channels are large conductance, voltage and calcium-sensitive potassium channels which are fundamental to the control of smooth muscle tone and neuronal excitability. MaxiK channels can be formed by 2 subunits: the pore-forming alpha subunit and the product of this gene, the modulatory beta subunit. Intracellular calcium regulates the physical association between the alpha and beta subunits. [provided by RefSeq, Jul 2008]

KCNIP1 (HGNC:15521): (potassium voltage-gated channel interacting protein 1) This gene encodes a member of the family of cytosolic voltage-gated potassium (Kv) channel-interacting proteins (KCNIPs), which belong to the neuronal calcium sensor (NCS) family of the calcium binding EF-hand proteins. They associate with Kv4 alpha subunits to form native Kv4 channel complexes. The encoded protein may regulate rapidly inactivating (A-type) currents, and hence neuronal membrane excitability, in response to changes in the concentration of intracellular calcium. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, May 2013]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.92).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.23 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNMB1	NM_004137.4	c.*297A>G		3_prime_UTR_variant	4/4	ENST00000274629.9
KCNIP1	NM_001034838.3	c.88+24443T>C		intron_variant
KCNIP1	XM_017009407.2	c.88+24443T>C		intron_variant
KCNIP1	XM_017009408.2	c.88+24443T>C		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNMB1	ENST00000274629.9	c.*297A>G		3_prime_UTR_variant	4/4	1	NM_004137.4	P1
KCNIP1	ENST00000377360.8	c.88+24443T>C		intron_variant		1		P4
KCNIP1	ENST00000517344.1	c.88+24443T>C		intron_variant, NMD_transcript_variant		3
KCNIP1	ENST00000518527.1	n.478+24443T>C		intron_variant, non_coding_transcript_variant		4

Frequencies

GnomAD3 genomes AF: 0.135 AC: 20497 AN: 151912 Hom.: 1690 Cov.: 32

Gnomad AFR AF: 0.234

Gnomad AMI AF: 0.0208

Gnomad AMR AF: 0.137

Gnomad ASJ AF: 0.151

Gnomad EAS AF: 0.126

Gnomad SAS AF: 0.132

Gnomad FIN AF: 0.0601

Gnomad MID AF: 0.212

Gnomad NFE AF: 0.0867

Gnomad OTH AF: 0.145

GnomAD4 exome AF: 0.0980 AC: 17937 AN: 183102 Hom.: 1114 Cov.: 0 AF XY: 0.0983 AC XY: 9105 AN XY: 92640

Gnomad4 AFR exome AF: 0.228

Gnomad4 AMR exome AF: 0.144

Gnomad4 ASJ exome AF: 0.144

Gnomad4 EAS exome AF: 0.130

Gnomad4 SAS exome AF: 0.107

Gnomad4 FIN exome AF: 0.0527

Gnomad4 NFE exome AF: 0.0839

Gnomad4 OTH exome AF: 0.110

GnomAD4 genome AF: 0.135 AC: 20536 AN: 152030 Hom.: 1699 Cov.: 32 AF XY: 0.135 AC XY: 9999 AN XY: 74322

Gnomad4 AFR AF: 0.234

Gnomad4 AMR AF: 0.137

Gnomad4 ASJ AF: 0.151

Gnomad4 EAS AF: 0.126

Gnomad4 SAS AF: 0.132

Gnomad4 FIN AF: 0.0601

Gnomad4 NFE AF: 0.0867

Gnomad4 OTH AF: 0.144

Alfa AF: 0.107 Hom.: 990

Bravo AF: 0.144

Asia WGS AF: 0.155 AC: 537 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.92
Cadd	Benign	0.31
Dann	Benign	0.45

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: rs314156; hg19: chr5-169805411;