NM_201596.3:c.1A>T

Variant names:

• chr10-18140737-A-T
• rs746311834
• NM_201596.3:c.1A>T
• CACNB2 p.Met1?

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PVS1_Supporting PM2

The NM_201596.3(CACNB2):​c.1A>T​(p.Met1?) variant causes a initiator codon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000694 in 1,440,224 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: CACNB2 NM_201596.3 initiator_codon
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.00
• Publications: 0 publications found

Genes affected

CACNB2 (HGNC:1402): (calcium voltage-gated channel auxiliary subunit beta 2) This gene encodes a subunit of a voltage-dependent calcium channel protein that is a member of the voltage-gated calcium channel superfamily. The gene product was originally identified as an antigen target in Lambert-Eaton myasthenic syndrome, an autoimmune disorder. Mutations in this gene are associated with Brugada syndrome. Alternatively spliced variants encoding different isoforms have been described. [provided by RefSeq, Feb 2013]

CACNB2 Gene-Disease associations (from GenCC):

• Brugada syndrome 4

  Inheritance: Unknown, AD Classification: LIMITED, NO_KNOWN Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, Ambry Genetics
• cardiogenetic disease

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
• hypertrophic cardiomyopathy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
• short QT syndrome

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PVS1: Start lost variant, no pathogenic variants between lost start and next in-frame start position. Next in-frame start position is after 6 codons. Genomic position: 18140752. Lost 0.008 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_201596.3. 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
	CACNB2	NM_201596.3	MANE Select	c.1A>T	p.Met1?	initiator_codon	Exon 1 of 14	NP_963890.2	Q08289-1
	CACNB2	NM_201571.4		c.-443A>T		5_prime_UTR_premature_start_codon_gain	Exon 1 of 14	NP_963865.2	Q08289-4
	CACNB2	NM_201572.4		c.-443A>T		5_prime_UTR_premature_start_codon_gain	Exon 1 of 14	NP_963866.2	Q08289-9

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNB2	ENST00000324631.13	TSL:1 MANE Select	c.1A>T	p.Met1?	initiator_codon	Exon 1 of 14	ENSP00000320025.8	Q08289-1
	CACNB2	ENST00000352115.10	TSL:1	c.1A>T	p.Met1?	initiator_codon	Exon 1 of 14	ENSP00000344474.6	Q08289-8
	CACNB2	ENST00000377328.5	TSL:1	c.1A>T	p.Met1?	initiator_codon	Exon 1 of 7	ENSP00000366545.1	A6PVM6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.94e-7 AC: 1 AN: 1440224 Hom.: 0 Cov.: 32 AF XY: 0.00000140 AC XY: 1 AN XY: 714336

African (AFR) AF: 0.00 AC: 0 AN: 33266

American (AMR) AF: 0.00 AC: 0 AN: 41296

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25626

East Asian (EAS) AF: 0.00 AC: 0 AN: 38928

South Asian (SAS) AF: 0.00 AC: 0 AN: 82664

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50252

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5510

European-Non Finnish (NFE) AF: 9.07e-7 AC: 1 AN: 1103128

Other (OTH) AF: 0.00 AC: 0 AN: 59554

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.090	D
BayesDel_noAF	Benign	-0.11
CADD	Benign	22
DANN	Benign	0.71
DEOGEN2	Benign	0.077	T
Eigen	Benign	-0.51
Eigen_PC	Benign	-0.50
FATHMM_MKL	Benign	0.65	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.93	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Benign	-0.45	T
PhyloP100		1.0
PROVEAN	Benign	-0.75	N
REVEL	Uncertain	0.39
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
PromoterAI		0.39	Neutral
Varity_R		0.78
gMVP		0.23
Mutation Taster		=46/154	disease causing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs746311834;

hg19: chr10-18429666;