rs748418783

Variant names:

• chr19-13298709-C-A
• rs748418783
• NM_001127222.2:c.2924G>T

Your query was ambiguous. Multiple possible variants found:

• chr19-13298709-C-A
• chr19-13298709-C-T

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4 BS2

The NM_001127222.2(CACNA1A):​c.2924G>T​(p.Arg975Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000015 in 1,466,374 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 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. R975Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000015 (0 hom.)
• Consequence: CACNA1A NM_001127222.2 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:5
• Conservation: PhyloP100: 2.76
• 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: Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp, Orphanet
• undetermined early-onset epileptic encephalopathy

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

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

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

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

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.35452172).
• BS2: High AC in GnomAdExome4 at 20 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001127222.2. 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
	CACNA1A	NM_001127222.2	MANE Select	c.2924G>T	p.Arg975Leu	missense	Exon 19 of 47	NP_001120694.1	O00555-8
	CACNA1A	NM_001127221.2	MANE Plus Clinical	c.2927G>T	p.Arg976Leu	missense	Exon 19 of 47	NP_001120693.1	O00555-3
	CACNA1A	NM_023035.3		c.2936G>T	p.Arg979Leu	missense	Exon 19 of 48	NP_075461.2	A0A087WW63

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA1A	ENST00000360228.11	TSL:1 MANE Select	c.2924G>T	p.Arg975Leu	missense	Exon 19 of 47	ENSP00000353362.5	O00555-8
	CACNA1A	ENST00000638009.2	TSL:1 MANE Plus Clinical	c.2927G>T	p.Arg976Leu	missense	Exon 19 of 47	ENSP00000489913.1	O00555-3
	CACNA1A	ENST00000638029.1	TSL:5	c.2936G>T	p.Arg979Leu	missense	Exon 19 of 48	ENSP00000489829.1	A0A087WW63

Frequencies

GnomAD3 genomes AF: 0.0000132 AC: 2 AN: 151896 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000656

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: 0.000479

GnomAD2 exomes AF: 0.0000268 AC: 2 AN: 74750 AF XY: 0.0000232

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000358

Gnomad OTH exome AF: 0.000491

GnomAD4 exome AF: 0.0000152 AC: 20 AN: 1314478 Hom.: 0 Cov.: 32 AF XY: 0.0000185 AC XY: 12 AN XY: 648014

African (AFR) AF: 0.00 AC: 0 AN: 25778

American (AMR) AF: 0.0000462 AC: 1 AN: 21648

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 21812

East Asian (EAS) AF: 0.00 AC: 0 AN: 29034

South Asian (SAS) AF: 0.00 AC: 0 AN: 69290

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 42490

Middle Eastern (MID) AF: 0.000611 AC: 3 AN: 4914

European-Non Finnish (NFE) AF: 0.0000124 AC: 13 AN: 1045480

Other (OTH) AF: 0.0000555 AC: 3 AN: 54032

GnomAD4 genome AF: 0.0000132 AC: 2 AN: 151896 Hom.: 0 Cov.: 33 AF XY: 0.0000135 AC XY: 1 AN XY: 74194

African (AFR) AF: 0.00 AC: 0 AN: 41378

American (AMR) AF: 0.0000656 AC: 1 AN: 15252

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5150

South Asian (SAS) AF: 0.00 AC: 0 AN: 4832

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10538

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 308

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67968

Other (OTH) AF: 0.000479 AC: 1 AN: 2086

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000113

ExAC AF: 0.0000496 AC: 2

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	Episodic ataxia type 2;C4310716:Developmental and epileptic encephalopathy, 42 (1)
-	1	-	Inborn genetic diseases (1)
-	1	-	not provided (1)
-	1	-	not specified (1)
-	1	-	Spinocerebellar ataxia type 6;C1720416:Episodic ataxia type 2;C1832884:Migraine, familial hemiplegic, 1;C4310716:Developmental and epileptic encephalopathy, 42 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.46
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
CADD	Uncertain	23
DANN	Benign	0.97
DEOGEN2	Benign	0.063	T
Eigen	Benign	-0.036
Eigen_PC	Benign	-0.073
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Uncertain	0.95	D
M_CAP	Pathogenic	0.96	D
MetaRNN	Benign	0.35	T
MetaSVM	Uncertain	0.40	D
MutationAssessor	Benign	1.6	L
PhyloP100		2.8
PrimateAI	Pathogenic	0.95	D
PROVEAN	Uncertain	-3.5	D
REVEL	Uncertain	0.38
Sift	Uncertain	0.0090	D
Sift4G	Uncertain	0.020	D
Vest4		0.35
MutPred		0.26		Loss of methylation at K973 (P = 0.0502)
MVP		0.90
MPC		1.9
ClinPred		0.32	T
GERP RS		4.1
Varity_R		0.34
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: rs748418783; hg19: chr19-13409523;