NM_001127222.2:c.6961_6975dupCAGCAGCAGCAGCAG

Variant names:

• chr19-13207858-C-CCTGCTGCTGCTGCTG
• rs16054
• NM_001127222.2:c.6961_6975dupCAGCAGCAGCAGCAG

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 0P and 11B. BP3 BP6_Moderate BS1 BS2

The NM_001127222.2(CACNA1A):​c.6961_6975dupCAGCAGCAGCAGCAG​(p.Gln2321_Gln2325dup) variant causes a conservative inframe insertion change involving the alteration of a non-conserved nucleotide. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.00018 (0 hom., cov: 0)
  • Exomes 𝑓: 0.00025 (3 hom.)
• Consequence: CACNA1A NM_001127222.2 conservative_inframe_insertion
• Clinical Significance: Likely benign criteria provided, single submitter B:2
• Conservation: PhyloP100: 0.00
• Publications: 10 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: 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

ENSG00000300728 (HGNC:):

ACMG classification

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

• BP3: Nonframeshift variant in repetitive region in NM_001127222.2
• BP6: Variant 19-13207858-C-CCTGCTGCTGCTGCTG is Benign according to our data. Variant chr19-13207858-C-CCTGCTGCTGCTGCTG is described in ClinVar as Likely_benign. ClinVar VariationId is 3025686.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.000183 (27/147904) while in subpopulation EAS AF = 0.00166 (8/4816). AF 95% confidence interval is 0.000826. There are 0 homozygotes in GnomAd4. There are 18 alleles in the male GnomAd4 subpopulation. Median coverage is 0. This position passed quality control check.
• BS2: High AC in GnomAd4 at 27 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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA1A	NM_001127222.2	MANE Select	c.6961_6975dupCAGCAGCAGCAGCAG	p.Gln2321_Gln2325dup	conservative_inframe_insertion	Exon 47 of 47	NP_001120694.1	O00555-8
	CACNA1A	NM_001127221.2	MANE Plus Clinical	c.*173_*187dupCAGCAGCAGCAGCAG		3_prime_UTR	Exon 47 of 47	NP_001120693.1	O00555-3
	CACNA1A	NM_023035.3		c.6979_6993dupCAGCAGCAGCAGCAG	p.Gln2327_Gln2331dup	conservative_inframe_insertion	Exon 48 of 48	NP_075461.2	A0A087WW63

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA1A	ENST00000360228.11	TSL:1 MANE Select	c.6961_6975dupCAGCAGCAGCAGCAG	p.Gln2321_Gln2325dup	conservative_inframe_insertion	Exon 47 of 47	ENSP00000353362.5	O00555-8
	CACNA1A	ENST00000638029.1	TSL:5	c.6979_6993dupCAGCAGCAGCAGCAG	p.Gln2327_Gln2331dup	conservative_inframe_insertion	Exon 48 of 48	ENSP00000489829.1	A0A087WW63
	CACNA1A	ENST00000573710.7	TSL:5	c.6967_6981dupCAGCAGCAGCAGCAG	p.Gln2323_Gln2327dup	conservative_inframe_insertion	Exon 47 of 47	ENSP00000460092.3	A0A1C7CYY9

Frequencies

GnomAD3 genomes AF: 0.000176 AC: 26 AN: 147802 Hom.: 0 Cov.: 0

Gnomad AFR AF: 0.0000249

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000669

Gnomad ASJ AF: 0.00407

Gnomad EAS AF: 0.00145

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000450

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.000250 AC: 321 AN: 1283932 Hom.: 3 Cov.: 0 AF XY: 0.000283 AC XY: 179 AN XY: 631942

African (AFR) AF: 0.00 AC: 0 AN: 24928

American (AMR) AF: 0.0000415 AC: 1 AN: 24096

Ashkenazi Jewish (ASJ) AF: 0.00433 AC: 94 AN: 21718

East Asian (EAS) AF: 0.00399 AC: 118 AN: 29594

South Asian (SAS) AF: 0.000137 AC: 9 AN: 65608

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 33418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3752

European-Non Finnish (NFE) AF: 0.0000701 AC: 72 AN: 1027672

Other (OTH) AF: 0.000508 AC: 27 AN: 53146

GnomAD4 genome AF: 0.000183 AC: 27 AN: 147904 Hom.: 0 Cov.: 0 AF XY: 0.000250 AC XY: 18 AN XY: 72002

African (AFR) AF: 0.0000249 AC: 1 AN: 40206

American (AMR) AF: 0.0000668 AC: 1 AN: 14968

Ashkenazi Jewish (ASJ) AF: 0.00407 AC: 14 AN: 3436

East Asian (EAS) AF: 0.00166 AC: 8 AN: 4816

South Asian (SAS) AF: 0.00 AC: 0 AN: 4704

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 9952

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 276

European-Non Finnish (NFE) AF: 0.0000450 AC: 3 AN: 66606

Other (OTH) AF: 0.00 AC: 0 AN: 2044

Alfa AF: 0.00 Hom.: 195

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	CACNA1A-related disorder (1)
-	-	1	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.0
Mutation Taster		=81/19	polymorphism

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs16054; hg19: chr19-13318672;