Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_001127222.2(CACNA1A):c.3043G>A(p.Gly1015Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000402 in 1,541,918 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. G1015G) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000030 ( 1 hom. )

Consequence

CACNA1A
NM_001127222.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:3

Conservation

PhyloP100: -0.551

Publications

3 publications found

Variant links:

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

CACNA1A links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.03501746).

BP6

Variant 19-13298590-C-T is Benign according to our data. Variant chr19-13298590-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 391779.

BS1

Variant frequency is greater than expected in population afr. GnomAdExome4 allele frequency = 0.0000302 (42/1389662) while in subpopulation AFR AF = 0.000937 (28/29892). AF 95% confidence interval is 0.000665. There are 1 homozygotes in GnomAdExome4. There are 17 alleles in the male GnomAdExome4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 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

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
CACNA1A	NM_001127222.2	MANE Select	c.3043G>A	p.Gly1015Arg	missense	Exon 19 of 47	NP_001120694.1
CACNA1A	NM_001127221.2	MANE Plus Clinical	c.3046G>A	p.Gly1016Arg	missense	Exon 19 of 47	NP_001120693.1
CACNA1A	NM_023035.3		c.3055G>A	p.Gly1019Arg	missense	Exon 19 of 48	NP_075461.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
CACNA1A	ENST00000360228.11	TSL:1 MANE Select	c.3043G>A	p.Gly1015Arg	missense	Exon 19 of 47	ENSP00000353362.5
CACNA1A	ENST00000638009.2	TSL:1 MANE Plus Clinical	c.3046G>A	p.Gly1016Arg	missense	Exon 19 of 47	ENSP00000489913.1
CACNA1A	ENST00000638029.1	TSL:5	c.3055G>A	p.Gly1019Arg	missense	Exon 19 of 48	ENSP00000489829.1

Frequencies

GnomAD3 genomes

AF:

0.000125

AC:

AN:

152140

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000410

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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

GnomAD2 exomes

AF:

0.0000138

AC:

AN:

144838

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.000332

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000302

AC:

AN:

1389662

Hom.:

Cov.:

AF XY:

0.0000248

AC XY:

AN XY:

685376

show subpopulations

African (AFR)

AF:

0.000937

AC:

AN:

29892

American (AMR)

AF:

0.00

AC:

AN:

35112

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24846

East Asian (EAS)

AF:

0.00

AC:

AN:

34070

South Asian (SAS)

AF:

0.0000254

AC:

AN:

78854

European-Finnish (FIN)

AF:

0.00

AC:

AN:

49216

Middle Eastern (MID)

AF:

0.000530

AC:

AN:

5658

European-Non Finnish (NFE)

AF:

9.31e-7

AC:

AN:

1074454

Other (OTH)

AF:

0.000139

AC:

AN:

57560

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000131

AC:

AN:

152256

Hom.:

Cov.:

AF XY:

0.0000940

AC XY:

AN XY:

74460

show subpopulations

African (AFR)

AF:

0.000433

AC:

AN:

41564

American (AMR)

AF:

0.000131

AC:

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5160

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10600

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68008

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000118

Hom.:

Bravo

AF:

0.000110

ExAC

AF:

0.0000320

AC:

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (4)

Episodic ataxia type 2;C4310716:Developmental and epileptic encephalopathy, 42 (1)

Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.34

BayesDel_addAF

Benign

-0.030

BayesDel_noAF

Benign

-0.28

CADD

Benign

0.95

(source)

DANN

Benign

0.84

DEOGEN2

Benign

0.031

Eigen

Benign

-1.3

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.063

LIST_S2

Benign

0.85

M_CAP

Uncertain

0.27

MetaRNN

Benign

0.035

MetaSVM

Uncertain

-0.11

MutationAssessor

Benign

1.1

PhyloP100

-0.55

PrimateAI

Uncertain

0.74

PROVEAN

Benign

-1.7

REVEL

Benign

0.18

Sift

Benign

0.49

Sift4G

Benign

0.16

Vest4

0.080

MutPred

0.19

Gain of MoRF binding (P = 0.0682)

MVP

0.76

MPC

1.3

ClinPred

0.020

GERP RS

-1.7

Varity_R

0.14

gMVP

0.24

Mutation Taster

=95/5

polymorphism

(source)

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

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rs190551509

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over