chr19-13207410-C-A

Variant names:

• chr19-13207410-C-A
• rs1239663368
• NM_001127222.2:c.7424G>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_023035.3(CACNA1A):​c.7442G>T​(p.Gly2481Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000724 in 1,381,702 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G2481D) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: CACNA1A NM_023035.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.36
• Publications: 0 publications found

Genes affected

CACNA1A (HGNC:1388): (calcium voltage-gated channel subunit alpha1 A) Voltage-dependent calcium channels mediate the entry of calcium ions into excitable cells, and are also involved in a variety of calcium-dependent processes, including muscle contraction, hormone or neurotransmitter release, and gene expression. Calcium channels are multisubunit complexes composed of alpha-1, beta, alpha-2/delta, and gamma subunits. The channel activity is directed by the pore-forming alpha-1 subunit, whereas, the others act as auxiliary subunits regulating this activity. The distinctive properties of the calcium channel types are related primarily to the expression of a variety of alpha-1 isoforms, alpha-1A, B, C, D, E, and S. This gene encodes the alpha-1A subunit, which is predominantly expressed in neuronal tissue. Mutations in this gene are associated with 2 neurologic disorders, familial hemiplegic migraine and episodic ataxia 2. This gene also exhibits polymorphic variation due to (CAG)n-repeats. Multiple transcript variants encoding different isoforms have been found for this gene. In one set of transcript variants, the (CAG)n-repeats occur in the 3' UTR, and are not associated with any disease. But in another set of variants, an insertion extends the coding region to include the (CAG)n-repeats which encode a polyglutamine tract. Expansion of the (CAG)n-repeats from the normal 4-18 to 21-33 in the coding region is associated with spinocerebellar ataxia 6. [provided by RefSeq, Jul 2016]

CACNA1A Gene-Disease associations (from GenCC):

• episodic ataxia type 2

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• undetermined early-onset epileptic encephalopathy

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, Illumina
• developmental and epileptic encephalopathy, 42

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• migraine, familial hemiplegic, 1

  Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• spinocerebellar ataxia type 6

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Orphanet
• benign paroxysmal torticollis of infancy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial or sporadic hemiplegic migraine

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Lennox-Gastaut syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000300728 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_023035.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA1A	NM_001127222.2	MANE Select	c.7424G>T	p.Gly2475Val	missense	Exon 47 of 47	NP_001120694.1
	CACNA1A	NM_001127221.2	MANE Plus Clinical	c.*636G>T		3_prime_UTR	Exon 47 of 47	NP_001120693.1
	CACNA1A	NM_023035.3		c.7442G>T	p.Gly2481Val	missense	Exon 48 of 48	NP_075461.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA1A	ENST00000360228.11	TSL:1 MANE Select	c.7424G>T	p.Gly2475Val	missense	Exon 47 of 47	ENSP00000353362.5
	CACNA1A	ENST00000638029.1	TSL:5	c.7442G>T	p.Gly2481Val	missense	Exon 48 of 48	ENSP00000489829.1
	CACNA1A	ENST00000573710.7	TSL:5	c.7430G>T	p.Gly2477Val	missense	Exon 47 of 47	ENSP00000460092.3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 7.24e-7 AC: 1 AN: 1381702 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 683564

African (AFR) AF: 0.0000327 AC: 1 AN: 30570

American (AMR) AF: 0.00 AC: 0 AN: 36126

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24696

East Asian (EAS) AF: 0.00 AC: 0 AN: 35236

South Asian (SAS) AF: 0.00 AC: 0 AN: 79814

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 34618

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5624

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1077632

Other (OTH) AF: 0.00 AC: 0 AN: 57386

GnomAD4 genome Cov.: 31

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.80
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
CADD	Uncertain	25
DANN	Benign	0.96
DEOGEN2	Benign	0.21	T
Eigen	Benign	0.042
Eigen_PC	Benign	0.038
FATHMM_MKL	Benign	0.51	D
LIST_S2	Uncertain	0.87	D
M_CAP	Pathogenic	0.98	D
MetaRNN	Uncertain	0.68	D
MetaSVM	Pathogenic	0.81	D
PhyloP100		1.4
PrimateAI	Pathogenic	0.95	D
PROVEAN	Pathogenic	-5.9	D
REVEL	Uncertain	0.60
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0030	D
Vest4		0.24
MutPred		0.39		Loss of loop (P = 0.0603)
MVP		0.87
MPC		1.0
ClinPred		0.84	D
GERP RS		3.0
Varity_R		0.71
gMVP		0.50
Mutation Taster		=80/20	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: rs1239663368; hg19: chr19-13318224;