NM_001127222.2:c.3684G>A

Variant names:

• chr19-13285076-C-T
• rs368048030
• NM_001127222.2:c.3684G>A

Variant summary

Our verdict is Benign. Variant got -19 ACMG points: 0P and 19B. BP4_Moderate BP6_Very_Strong BP7 BS1 BS2

The NM_001127222.2(CACNA1A):​c.3684G>A​(p.Thr1228Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000892 in 1,613,944 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 Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.000085 (0 hom., cov: 31)
  • Exomes 𝑓: 0.000090 (0 hom.)
• Consequence: CACNA1A NM_001127222.2 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:4
• Conservation: PhyloP100: -2.89

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 Benign. Variant got -19 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.35).
• BP6: Variant 19-13285076-C-T is Benign according to our data. Variant chr19-13285076-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 511871.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-2.89 with no splicing effect.
• BS1: Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.0000854 (13/152246) while in subpopulation SAS AF= 0.00166 (8/4824). AF 95% confidence interval is 0.000825. There are 0 homozygotes in gnomad4. There are 7 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 13 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CACNA1A	NM_001127222.2	c.3684G>A	p.Thr1228Thr	synonymous_variant	Exon 21 of 47	ENST00000360228.11	NP_001120694.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CACNA1A	ENST00000360228.11	c.3684G>A	p.Thr1228Thr	synonymous_variant	Exon 21 of 47	1	NM_001127222.2	ENSP00000353362.5
CACNA1A	ENST00000638029.1	c.3696G>A	p.Thr1232Thr	synonymous_variant	Exon 21 of 48	5		ENSP00000489829.1
CACNA1A	ENST00000573710.7	c.3690G>A	p.Thr1230Thr	synonymous_variant	Exon 21 of 47	5		ENSP00000460092.3
CACNA1A	ENST00000635727.1	c.3687G>A	p.Thr1229Thr	synonymous_variant	Exon 21 of 47	5		ENSP00000490001.1
CACNA1A	ENST00000637769.1	c.3687G>A	p.Thr1229Thr	synonymous_variant	Exon 21 of 47	1		ENSP00000489778.1
CACNA1A	ENST00000636012.1	c.3687G>A	p.Thr1229Thr	synonymous_variant	Exon 21 of 46	5		ENSP00000490223.1
CACNA1A	ENST00000637736.1	c.3546G>A	p.Thr1182Thr	synonymous_variant	Exon 20 of 46	5		ENSP00000489861.1
CACNA1A	ENST00000636389.1	c.3687G>A	p.Thr1229Thr	synonymous_variant	Exon 21 of 47	5		ENSP00000489992.1
CACNA1A	ENST00000637432.1	c.3696G>A	p.Thr1232Thr	synonymous_variant	Exon 21 of 48	5		ENSP00000490617.1
CACNA1A	ENST00000636549.1	c.3687G>A	p.Thr1229Thr	synonymous_variant	Exon 21 of 48	5		ENSP00000490578.1
CACNA1A	ENST00000637927.1	c.3690G>A	p.Thr1230Thr	synonymous_variant	Exon 21 of 47	5		ENSP00000489715.1
CACNA1A	ENST00000635895.1	c.3687G>A	p.Thr1229Thr	synonymous_variant	Exon 21 of 47	5		ENSP00000490323.1
CACNA1A	ENST00000638009.2	c.3687G>A	p.Thr1229Thr	synonymous_variant	Exon 21 of 47	1		ENSP00000489913.1
CACNA1A	ENST00000637276.1	c.3687G>A	p.Thr1229Thr	synonymous_variant	Exon 21 of 46	5		ENSP00000489777.1

Frequencies

GnomAD3 genomes AF: 0.0000855 AC: 13 AN: 152128 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00166

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000588

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000219 AC: 54 AN: 246858 Hom.: 0 AF XY: 0.000276 AC XY: 37 AN XY: 134144

Gnomad AFR exome AF: 0.0000646

Gnomad AMR exome AF: 0.0000290

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00144

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000723

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000896 AC: 131 AN: 1461698 Hom.: 0 Cov.: 32 AF XY: 0.000118 AC XY: 86 AN XY: 727132

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000447

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00124

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000162

Gnomad4 OTH exome AF: 0.0000497

GnomAD4 genome AF: 0.0000854 AC: 13 AN: 152246 Hom.: 0 Cov.: 31 AF XY: 0.0000940 AC XY: 7 AN XY: 74436

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00166

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000588

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000126 Hom.: 0

Bravo AF: 0.0000227

Asia WGS AF: 0.000866 AC: 3 AN: 3478

EpiCase AF: 0.000109

EpiControl AF: 0.000119

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:1

Jul 28, 2017

Eurofins Ntd Llc (ga)

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

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

Jan 14, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Benign:1

Apr 21, 2021

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

CACNA1A-related disorder Benign:1

Jul 24, 2019

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.35
CADD	Benign	0.49
DANN	Benign	0.88

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: rs368048030; hg19: chr19-13395890;