19-13207408-A-T

Variant names:

• chr19-13207408-A-T
• rs779631503
• NM_001127222.2:c.7426T>A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP2 BS2

The NM_001127222.2(CACNA1A):​c.7426T>A​(p.Tyr2476Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000521 in 1,534,192 control chromosomes in the GnomAD database, including 1 homozygotes. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y2476H) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000040 (1 hom., cov: 31)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: CACNA1A NM_001127222.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.54

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]

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PP2: Missense variant in the CACNA1A gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 137 curated pathogenic missense variants (we use a threshold of 10). The gene has 132 curated benign missense variants. Gene score misZ: 5.7845 (above the threshold of 3.09). Trascript score misZ: 3.9354 (above the threshold of 3.09). GenCC associations: The gene is linked to benign paroxysmal torticollis of infancy, developmental and epileptic encephalopathy, 42, undetermined early-onset epileptic encephalopathy, episodic ataxia type 2, familial or sporadic hemiplegic migraine, spinocerebellar ataxia type 6, Lennox-Gastaut syndrome, migraine, familial hemiplegic, 1.
• BS2: High AC in GnomAd4 at 6 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CACNA1A	NM_001127222.2	c.7426T>A	p.Tyr2476Asn	missense_variant	Exon 47 of 47	ENST00000360228.11	NP_001120694.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CACNA1A	ENST00000360228.11	c.7426T>A	p.Tyr2476Asn	missense_variant	Exon 47 of 47	1	NM_001127222.2	ENSP00000353362.5
CACNA1A	ENST00000638029.1	c.7444T>A	p.Tyr2482Asn	missense_variant	Exon 48 of 48	5		ENSP00000489829.1
CACNA1A	ENST00000573710.7	c.7432T>A	p.Tyr2478Asn	missense_variant	Exon 47 of 47	5		ENSP00000460092.3
CACNA1A	ENST00000635727.1	c.7429T>A	p.Tyr2477Asn	missense_variant	Exon 47 of 47	5		ENSP00000490001.1
CACNA1A	ENST00000637769.1	c.7429T>A	p.Tyr2477Asn	missense_variant	Exon 47 of 47	1		ENSP00000489778.1
CACNA1A	ENST00000636012.1	c.7393T>A	p.Tyr2465Asn	missense_variant	Exon 46 of 46	5		ENSP00000490223.1
CACNA1A	ENST00000637736.1	c.7288T>A	p.Tyr2430Asn	missense_variant	Exon 46 of 46	5		ENSP00000489861.1
CACNA1A	ENST00000636389	c.*512T>A		3_prime_UTR_variant	Exon 47 of 47	5		ENSP00000489992.1
CACNA1A	ENST00000637432	c.*638T>A		3_prime_UTR_variant	Exon 48 of 48	5		ENSP00000490617.1
CACNA1A	ENST00000635895	c.*638T>A		3_prime_UTR_variant	Exon 47 of 47	5		ENSP00000490323.1
CACNA1A	ENST00000638009	c.*638T>A		3_prime_UTR_variant	Exon 47 of 47	1		ENSP00000489913.1

Frequencies

GnomAD3 genomes AF: 0.0000397 AC: 6 AN: 151160 Hom.: 1 Cov.: 31

Gnomad AFR AF: 0.000146

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.00000724 AC: 1 AN: 138216 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 76536

Gnomad AFR exome AF: 0.000172

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000145 AC: 2 AN: 1382924 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 684240

Gnomad4 AFR exome AF: 0.0000651

Gnomad4 AMR exome AF: 0.00

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000397 AC: 6 AN: 151268 Hom.: 1 Cov.: 31 AF XY: 0.0000541 AC XY: 4 AN XY: 73944

Gnomad4 AFR AF: 0.000145

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.66
BayesDel_addAF	Benign	-0.066	T
BayesDel_noAF	Uncertain	-0.060
CADD	Benign	22
DANN	Benign	0.93
DEOGEN2	Uncertain	0.63	.;D;T;.;.;T;.;T;.;.
Eigen	Benign	-0.15
Eigen_PC	Benign	-0.14
FATHMM_MKL	Benign	0.37	N
LIST_S2	Uncertain	0.90	D;D;D;D;D;D;.;D;D;D
M_CAP	Pathogenic	0.98	D
MetaRNN	Uncertain	0.43	T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.46	D
PrimateAI	Pathogenic	0.95	D
PROVEAN	Pathogenic	-5.2	.;D;.;.;.;.;.;.;.;.
REVEL	Uncertain	0.39
Sift	Uncertain	0.0090	.;D;.;.;.;.;.;.;.;.
Sift4G	Uncertain	0.013	D;D;.;D;.;.;.;.;.;.
Vest4		0.23
MutPred		0.29		.;Loss of phosphorylation at Y2476 (P = 0.0175);.;.;.;.;.;.;.;.;
MVP		0.86
MPC		0.95
ClinPred		0.44	T
GERP RS		2.9
Varity_R		0.41
gMVP		0.48

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: rs779631503; hg19: chr19-13318222;