9-137878085-AGC-A

Variant names:

• chr9-137878085-AGC-A
• NM_000718.4:c.160_161delCG

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_000718.4(CACNA1B):​c.160_161delCG​(p.Arg54AspfsTer66) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000025 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CACNA1B NM_000718.4 frameshift
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.90

Genes affected

CACNA1B (HGNC:1389): (calcium voltage-gated channel subunit alpha1 B) The protein encoded by this gene is the pore-forming subunit of an N-type voltage-dependent calcium channel, which controls neurotransmitter release from neurons. The encoded protein forms a complex with alpha-2, beta, and delta subunits to form the high-voltage activated channel. This channel is sensitive to omega-conotoxin-GVIA and omega-agatoxin-IIIA but insensitive to dihydropyridines. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2011]

ENSG00000203987 (HGNC:58213):

LOC100133077 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CACNA1B	NM_000718.4	c.160_161delCG	p.Arg54AspfsTer66	frameshift_variant	Exon 1 of 47	ENST00000371372.6	NP_000709.1
CACNA1B	NM_001243812.2	c.160_161delCG	p.Arg54AspfsTer66	frameshift_variant	Exon 1 of 47		NP_001230741.1
LOC100133077	NR_121583.1	n.2692-2407_2692-2406delGC		intron_variant	Intron 2 of 3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CACNA1B	ENST00000371372.6	c.160_161delCG	p.Arg54AspfsTer66	frameshift_variant	Exon 1 of 47	5	NM_000718.4	ENSP00000360423.1
CACNA1B	ENST00000371357.5	c.160_161delCG	p.Arg54AspfsTer66	frameshift_variant	Exon 1 of 46	5		ENSP00000360408.1
CACNA1B	ENST00000371363.5	c.160_161delCG	p.Arg54AspfsTer66	frameshift_variant	Exon 1 of 46	5		ENSP00000360414.1
CACNA1B	ENST00000277551.6	c.160_161delCG	p.Arg54AspfsTer66	frameshift_variant	Exon 1 of 47	5		ENSP00000277551.2

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000252 AC: 3 AN: 1190878 Hom.: 0 AF XY: 0.00000345 AC XY: 2 AN XY: 579460

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000579

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000206

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

May 09, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene or region of a gene for which loss of function is not a well-established mechanism of disease; Has not been previously published as pathogenic or benign to our knowledge; Variants in candidate genes are classified as variants of uncertain significance in accordance with ACMG guidelines (Richards et al., 2015) -

Computational scores

Source: dbNSFP v4.3

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr9-140772537;