rs943715197

Variant names:

• chr19-13253050-C-A
• rs943715197
• NM_001127222.2:c.4807G>T

Your query was ambiguous. Multiple possible variants found:

• chr19-13253050-C-A
• chr19-13253050-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1 PM2 PP2 PP3_Moderate

The NM_001127222.2(CACNA1A):​c.4807G>T​(p.Val1603Phe) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CACNA1A NM_001127222.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.15

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_pathogenic. Variant got 7 ACMG points.

• PM1: In a repeat IV (size 263) in uniprot entity CAC1A_HUMAN there are 14 pathogenic changes around while only 1 benign (93%) in NM_001127222.2
• PM2: Very rare variant in population databases, with high coverage
• 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.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.9

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CACNA1A	NM_001127222.2	c.4807G>T	p.Val1603Phe	missense_variant	Exon 30 of 47	ENST00000360228.11	NP_001120694.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CACNA1A	ENST00000360228.11	c.4807G>T	p.Val1603Phe	missense_variant	Exon 30 of 47	1	NM_001127222.2	ENSP00000353362.5
CACNA1A	ENST00000638029.1	c.4819G>T	p.Val1607Phe	missense_variant	Exon 30 of 48	5		ENSP00000489829.1
CACNA1A	ENST00000573710.7	c.4813G>T	p.Val1605Phe	missense_variant	Exon 30 of 47	5		ENSP00000460092.3
CACNA1A	ENST00000635727.1	c.4810G>T	p.Val1604Phe	missense_variant	Exon 30 of 47	5		ENSP00000490001.1
CACNA1A	ENST00000637769.1	c.4810G>T	p.Val1604Phe	missense_variant	Exon 30 of 47	1		ENSP00000489778.1
CACNA1A	ENST00000636012.1	c.4810G>T	p.Val1604Phe	missense_variant	Exon 30 of 46	5		ENSP00000490223.1
CACNA1A	ENST00000637736.1	c.4669G>T	p.Val1557Phe	missense_variant	Exon 29 of 46	5		ENSP00000489861.1
CACNA1A	ENST00000636389.1	c.4810G>T	p.Val1604Phe	missense_variant	Exon 30 of 47	5		ENSP00000489992.1
CACNA1A	ENST00000637432.1	c.4819G>T	p.Val1607Phe	missense_variant	Exon 30 of 48	5		ENSP00000490617.1
CACNA1A	ENST00000636549.1	c.4810G>T	p.Val1604Phe	missense_variant	Exon 30 of 48	5		ENSP00000490578.1
CACNA1A	ENST00000637927.1	c.4813G>T	p.Val1605Phe	missense_variant	Exon 30 of 47	5		ENSP00000489715.1
CACNA1A	ENST00000635895.1	c.4810G>T	p.Val1604Phe	missense_variant	Exon 30 of 47	5		ENSP00000490323.1
CACNA1A	ENST00000638009.2	c.4810G>T	p.Val1604Phe	missense_variant	Exon 30 of 47	1		ENSP00000489913.1
CACNA1A	ENST00000637276.1	c.4810G>T	p.Val1604Phe	missense_variant	Exon 30 of 46	5		ENSP00000489777.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Episodic ataxia type 2 Uncertain:1

Sep 29, 2022

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.46
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.39
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Benign	0.085	.;.;T;.;.;.;.;.;.;.;T;.;.;.;T;.;.
Eigen	Uncertain	0.41
Eigen_PC	Uncertain	0.45
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.96	D;D;D;D;D;D;D;D;D;.;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.49	D
MetaRNN	Pathogenic	0.90	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Benign	1.0	.;.;.;.;L;.;.;.;.;.;.;.;.;L;.;.;.
PrimateAI	Uncertain	0.79	T
PROVEAN	Pathogenic	-4.4	.;D;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.
REVEL	Pathogenic	0.92
Sift	Uncertain	0.022	.;D;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.
Sift4G	Benign	0.070	T;T;.;.;.;D;.;.;.;.;.;.;.;.;.;.;.
Vest4		0.81
MutPred		0.71		.;.;Loss of stability (P = 0.0655);Loss of stability (P = 0.0655);Loss of stability (P = 0.0655);.;.;Loss of stability (P = 0.0655);.;.;Loss of stability (P = 0.0655);Loss of stability (P = 0.0655);.;Loss of stability (P = 0.0655);.;Loss of stability (P = 0.0655);.;
MVP		0.97
MPC		2.7
ClinPred		0.99	D
GERP RS		4.4
Varity_R		0.57
gMVP		0.98

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: rs943715197; hg19: chr19-13363864;