NM_001127222.2:c.1345+1928T>C

Variant names:

• chr19-13328316-A-G
• rs8101955
• NM_001127222.2:c.1345+1928T>C

Variant summary

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

The NM_001127222.2(CACNA1A):​c.1345+1928T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.245 in 152,160 control chromosomes in the GnomAD database, including 5,753 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 0.24 (5753 hom., cov: 32)
• Consequence: CACNA1A NM_001127222.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0960
• Publications: 5 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

ENSG00000306107 (HGNC:):

ACMG classification

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

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.78).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.439 is higher than 0.05.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA1A	NM_001127222.2	MANE Select	c.1345+1928T>C		intron	N/A	NP_001120694.1
	CACNA1A	NM_001127221.2	MANE Plus Clinical	c.1348+1928T>C		intron	N/A	NP_001120693.1
	CACNA1A	NM_023035.3		c.1348+1928T>C		intron	N/A	NP_075461.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA1A	ENST00000360228.11	TSL:1 MANE Select	c.1345+1928T>C		intron	N/A	ENSP00000353362.5
	CACNA1A	ENST00000638009.2	TSL:1 MANE Plus Clinical	c.1348+1928T>C		intron	N/A	ENSP00000489913.1
	CACNA1A	ENST00000638029.1	TSL:5	c.1348+1928T>C		intron	N/A	ENSP00000489829.1

Frequencies

GnomAD3 genomes AF: 0.245 AC: 37180 AN: 152040 Hom.: 5726 Cov.: 32

Gnomad AFR AF: 0.444

Gnomad AMI AF: 0.149

Gnomad AMR AF: 0.194

Gnomad ASJ AF: 0.190

Gnomad EAS AF: 0.152

Gnomad SAS AF: 0.246

Gnomad FIN AF: 0.171

Gnomad MID AF: 0.182

Gnomad NFE AF: 0.158

Gnomad OTH AF: 0.231

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

GnomAD4 genome AF: 0.245 AC: 37262 AN: 152160 Hom.: 5753 Cov.: 32 AF XY: 0.243 AC XY: 18059 AN XY: 74410

African (AFR) AF: 0.444 AC: 18424 AN: 41480

American (AMR) AF: 0.194 AC: 2970 AN: 15282

Ashkenazi Jewish (ASJ) AF: 0.190 AC: 660 AN: 3468

East Asian (EAS) AF: 0.152 AC: 788 AN: 5180

South Asian (SAS) AF: 0.246 AC: 1186 AN: 4822

European-Finnish (FIN) AF: 0.171 AC: 1818 AN: 10608

Middle Eastern (MID) AF: 0.182 AC: 53 AN: 292

European-Non Finnish (NFE) AF: 0.158 AC: 10736 AN: 68008

Other (OTH) AF: 0.233 AC: 491 AN: 2108

Alfa AF: 0.190 Hom.: 11002

Bravo AF: 0.256

Asia WGS AF: 0.237 AC: 823 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.78
CADD	Benign	10
DANN	Benign	0.65
PhyloP100		-0.096
Mutation Taster		=100/0	polymorphism (auto)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs8101955; hg19: chr19-13439130;