rs12609735

Variant names:

• chr19-13477702-T-C
• rs12609735
• NM_001127222.2:c.294-22490A>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_001127222.2(CACNA1A):​c.294-22490A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.2 in 152,124 control chromosomes in the GnomAD database, including 4,489 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.20 (4489 hom., cov: 32)
• Consequence: CACNA1A NM_001127222.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.155
• Publications: 8 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: 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

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-1.02).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.395 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CACNA1A	NM_001127222.2	c.294-22490A>G		intron_variant	Intron 1 of 46	ENST00000360228.11	NP_001120694.1
CACNA1A	NM_001127221.2	c.294-22490A>G		intron_variant	Intron 1 of 46	ENST00000638009.2	NP_001120693.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CACNA1A	ENST00000360228.11	c.294-22490A>G		intron_variant	Intron 1 of 46	1	NM_001127222.2	ENSP00000353362.5
CACNA1A	ENST00000638009.2	c.294-22490A>G		intron_variant	Intron 1 of 46	1	NM_001127221.2	ENSP00000489913.1
CACNA1A	ENST00000638029.1	c.294-22490A>G		intron_variant	Intron 1 of 47	5		ENSP00000489829.1
CACNA1A	ENST00000573710.7	c.294-22490A>G		intron_variant	Intron 1 of 46	5		ENSP00000460092.3
CACNA1A	ENST00000635727.1	c.294-22490A>G		intron_variant	Intron 1 of 46	5		ENSP00000490001.1
CACNA1A	ENST00000637769.1	c.294-22490A>G		intron_variant	Intron 1 of 46	1		ENSP00000489778.1
CACNA1A	ENST00000636012.1	c.294-22490A>G		intron_variant	Intron 1 of 45	5		ENSP00000490223.1
CACNA1A	ENST00000637736.1	c.259-24687A>G		intron_variant	Intron 1 of 45	5		ENSP00000489861.1
CACNA1A	ENST00000636389.1	c.294-22490A>G		intron_variant	Intron 1 of 46	5		ENSP00000489992.1
CACNA1A	ENST00000637432.1	c.294-22490A>G		intron_variant	Intron 1 of 47	5		ENSP00000490617.1
CACNA1A	ENST00000636549.1	c.294-22490A>G		intron_variant	Intron 1 of 47	5		ENSP00000490578.1
CACNA1A	ENST00000637927.1	c.294-22490A>G		intron_variant	Intron 1 of 46	5		ENSP00000489715.1
CACNA1A	ENST00000635895.1	c.294-22490A>G		intron_variant	Intron 1 of 46	5		ENSP00000490323.1
CACNA1A	ENST00000637276.1	c.294-22490A>G		intron_variant	Intron 1 of 45	5		ENSP00000489777.1
CACNA1A	ENST00000636768.2	n.294-22490A>G		intron_variant	Intron 1 of 44	5		ENSP00000490190.2
CACNA1A	ENST00000713789.1	n.294-22490A>G		intron_variant	Intron 1 of 46			ENSP00000519091.1

Frequencies

GnomAD3 genomes AF: 0.199 AC: 30312 AN: 152006 Hom.: 4474 Cov.: 32

Gnomad AFR AF: 0.400

Gnomad AMI AF: 0.0505

Gnomad AMR AF: 0.221

Gnomad ASJ AF: 0.0881

Gnomad EAS AF: 0.328

Gnomad SAS AF: 0.126

Gnomad FIN AF: 0.156

Gnomad MID AF: 0.101

Gnomad NFE AF: 0.0835

Gnomad OTH AF: 0.177

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.200 AC: 30354 AN: 152124 Hom.: 4489 Cov.: 32 AF XY: 0.202 AC XY: 15042 AN XY: 74394

African (AFR) AF: 0.400 AC: 16590 AN: 41460

American (AMR) AF: 0.222 AC: 3388 AN: 15294

Ashkenazi Jewish (ASJ) AF: 0.0881 AC: 306 AN: 3472

East Asian (EAS) AF: 0.328 AC: 1695 AN: 5170

South Asian (SAS) AF: 0.126 AC: 607 AN: 4824

European-Finnish (FIN) AF: 0.156 AC: 1652 AN: 10594

Middle Eastern (MID) AF: 0.0952 AC: 28 AN: 294

European-Non Finnish (NFE) AF: 0.0834 AC: 5673 AN: 67996

Other (OTH) AF: 0.175 AC: 369 AN: 2110

Alfa AF: 0.125 Hom.: 2501

Bravo AF: 0.217

Asia WGS AF: 0.222 AC: 773 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
CADD	Benign	4.1
DANN	Benign	0.68
PhyloP100		-0.15
Mutation Taster		=100/0	polymorphism (auto)

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: rs12609735; hg19: chr19-13588516;