dbSNP rs201350764: CACNA1A:c.1782-6C>T (chr19-13308257-G-A) – ACMG Classification: Benign (-13 pts)

Variant summary

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

The NM_001127222.2(CACNA1A):c.1782-6C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000975 in 1,610,732 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000091 ( 0 hom. )

Consequence

CACNA1A
NM_001127222.2 splice_region, intron

Scores

Splicing: ADA: 0.00007227

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:4

Conservation

PhyloP100: -0.162

Publications

0 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: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics
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, Labcorp Genetics (formerly Invitae), Ambry Genetics
migraine, familial hemiplegic, 1
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Ambry Genetics
spinocerebellar ataxia type 6
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Ambry Genetics, 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:

ENSG00000306107 (HGNC:):

ENSG00000306107 links:

Genome browser will be placed here

new If you want to explore the variant's impact on the transcript NM_001127222.2, check out the Mutation Effect Viewer. This is especially useful for frameshift variants or if you want to visualize the effect of exon loss / intron retention.

ACMG classification

Classification was made for transcript

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

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.77).

BP6

Variant 19-13308257-G-A is Benign according to our data. Variant chr19-13308257-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 500377.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000158 (24/152254) while in subpopulation SAS AF = 0.00124 (6/4822). AF 95% confidence interval is 0.000542. There are 0 homozygotes in GnomAd4. There are 13 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 24 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	Effect	Exon Rank	Protein	UniProt
CACNA1A	NM_001127222.2	MANE Select	c.1782-6C>T	splice_region intron	N/A	NP_001120694.1	O00555-8
CACNA1A	NM_001127221.2	MANE Plus Clinical	c.1785-6C>T	splice_region intron	N/A	NP_001120693.1	O00555-3
CACNA1A	NM_023035.3		c.1785-6C>T	splice_region intron	N/A	NP_075461.2	A0A087WW63

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
CACNA1A	ENST00000360228.11	TSL:1 MANE Select	c.1782-6C>T	splice_region intron	N/A	ENSP00000353362.5	O00555-8
CACNA1A	ENST00000638009.2	TSL:1 MANE Plus Clinical	c.1785-6C>T	splice_region intron	N/A	ENSP00000489913.1	O00555-3
CACNA1A	ENST00000638029.1	TSL:5	c.1785-6C>T	splice_region intron	N/A	ENSP00000489829.1	A0A087WW63

Frequencies

GnomAD3 genomes

AF:

0.000158

AC:

AN:

152136

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000786

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000386

Gnomad SAS

AF:

0.00124

Gnomad FIN

AF:

0.000188

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000934

AC:

AN:

246266

AF XY:

0.000105

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000235

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000279

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000537

Gnomad OTH exome

AF:

0.000167

GnomAD4 exome

AF:

0.0000912

AC:

133

AN:

1458478

Hom.:

Cov.:

AF XY:

0.0000910

AC XY:

AN XY:

725108

show subpopulations

African (AFR)

AF:

0.0000300

AC:

AN:

33360

American (AMR)

AF:

0.000315

AC:

AN:

44450

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25982

East Asian (EAS)

AF:

0.000176

AC:

AN:

39662

South Asian (SAS)

AF:

0.000198

AC:

AN:

85876

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53248

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5754

European-Non Finnish (NFE)

AF:

0.0000685

AC:

AN:

1109926

Other (OTH)

AF:

0.000299

AC:

AN:

60220

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.469

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.000158

AC:

AN:

152254

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74430

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41546

American (AMR)

AF:

0.000785

AC:

AN:

15294

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.000387

AC:

AN:

5170

South Asian (SAS)

AF:

0.00124

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.000188

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68012

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.517

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:

0.0000763

Hom.:

Bravo

AF:

0.000238

Asia WGS

AF:

0.00346

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (3)

CACNA1A-related disorder (1)

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

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.77

CADD

Benign

1.1

(source)

DANN

Benign

0.63

PhyloP100

-0.16

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000072

dbscSNV1_RF

Benign

0.022

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

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