dbSNP rs572722130: CACNA1A:p.Arg2155Leu (chr19-13209374-C-A) – ACMG Classification: Benign (-11 pts)

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 0P and 11B. BP4_ModerateBP6BS1BS2

The NM_001127222.2(CACNA1A):c.6464G>T(p.Arg2155Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000684 in 1,389,252 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R2155C) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00022 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000049 ( 1 hom. )

Consequence

CACNA1A
NM_001127222.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:5

Conservation

PhyloP100: 2.90

Publications

4 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: 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

CACNA1A links:

ENSG00000300728 (HGNC:):

ENSG00000300728 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -11 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.07586345).

BP6

Variant 19-13209374-C-A is Benign according to our data. Variant chr19-13209374-C-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 289416.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000223 (34/152280) while in subpopulation AFR AF = 0.000577 (24/41564). AF 95% confidence interval is 0.000398. There are 0 homozygotes in GnomAd4. There are 15 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High AC in GnomAd4 at 34 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	UniProt
CACNA1A	NM_001127222.2	MANE Select	c.6464G>T	p.Arg2155Leu	missense	Exon 45 of 47	NP_001120694.1	O00555-8
CACNA1A	NM_001127221.2	MANE Plus Clinical	c.6467G>T	p.Arg2156Leu	missense	Exon 45 of 47	NP_001120693.1	O00555-3
CACNA1A	NM_023035.3		c.6482G>T	p.Arg2161Leu	missense	Exon 46 of 48	NP_075461.2	A0A087WW63

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CACNA1A	ENST00000360228.11	TSL:1 MANE Select	c.6464G>T	p.Arg2155Leu	missense	Exon 45 of 47	ENSP00000353362.5	O00555-8
CACNA1A	ENST00000638009.2	TSL:1 MANE Plus Clinical	c.6467G>T	p.Arg2156Leu	missense	Exon 45 of 47	ENSP00000489913.1	O00555-3
CACNA1A	ENST00000638029.1	TSL:5	c.6482G>T	p.Arg2161Leu	missense	Exon 46 of 48	ENSP00000489829.1	A0A087WW63

Frequencies

GnomAD3 genomes

AF:

0.000223

AC:

AN:

152162

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000579

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00173

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000205

AC:

AN:

48850

AF XY:

0.0000404

show subpopulations

Gnomad AFR exome

AF:

0.000262

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:

0.0000493

AC:

AN:

1236972

Hom.:

Cov.:

AF XY:

0.0000553

AC XY:

AN XY:

597166

show subpopulations

African (AFR)

AF:

0.00129

AC:

AN:

25666

American (AMR)

AF:

0.0000685

AC:

AN:

14598

Ashkenazi Jewish (ASJ)

AF:

0.000233

AC:

AN:

17180

East Asian (EAS)

AF:

0.00

AC:

AN:

30452

South Asian (SAS)

AF:

0.00

AC:

AN:

52318

European-Finnish (FIN)

AF:

0.00

AC:

AN:

42710

Middle Eastern (MID)

AF:

0.000667

AC:

AN:

4496

European-Non Finnish (NFE)

AF:

0.0000160

AC:

AN:

999210

Other (OTH)

AF:

0.0000795

AC:

AN:

50342

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.483

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:

0.000223

AC:

AN:

152280

Hom.:

Cov.:

AF XY:

0.000201

AC XY:

AN XY:

74462

show subpopulations

African (AFR)

AF:

0.000577

AC:

AN:

41564

American (AMR)

AF:

0.00

AC:

AN:

15292

Ashkenazi Jewish (ASJ)

AF:

0.00173

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5160

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10628

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

68014

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.463

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:

0.00

Hom.:

Bravo

AF:

0.000159

ExAC

AF:

0.00000916

AC:

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (3)

not provided (2)

CACNA1A-related disorder (1)

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

0.46

BayesDel_addAF

Benign

-0.19

BayesDel_noAF

Benign

-0.21

CADD

Benign

(source)

DANN

Benign

0.95

DEOGEN2

Uncertain

0.79

Eigen

Benign

-0.21

Eigen_PC

Benign

-0.18

FATHMM_MKL

Uncertain

0.83

LIST_S2

Uncertain

0.97

M_CAP

Pathogenic

0.32

MetaRNN

Benign

0.076

MetaSVM

Benign

-0.45

MutationAssessor

Uncertain

2.0

PhyloP100

2.9

PrimateAI

Uncertain

0.79

PROVEAN

Pathogenic

-5.1

REVEL

Benign

0.24

Sift

Uncertain

0.026

Sift4G

Benign

0.16

Vest4

0.40

MVP

0.82

MPC

0.33

ClinPred

0.70

GERP RS

3.1

Varity_R

0.41

gMVP

0.38

Mutation Taster

=82/18

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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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

Computational scores

Splicing

Publications

Other links and lift over