NM_021098.3:c.801C>G

Variant names:

• chr16-1198772-C-G
• rs372726042
• NM_021098.3:c.801C>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_021098.3(CACNA1H):​c.801C>G​(p.Val267Val) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,457,296 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. V267V) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: CACNA1H NM_021098.3 splice_region, synonymous
• Scores: Splicing: ADA: 0.009292
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.466
• Publications: 0 publications found

Genes affected

CACNA1H (HGNC:1395): (calcium voltage-gated channel subunit alpha1 H) This gene encodes a T-type member of the alpha-1 subunit family, a protein in the voltage-dependent calcium channel complex. Calcium channels mediate the influx of calcium ions into the cell upon membrane polarization and consist of a complex of alpha-1, alpha-2/delta, beta, and gamma subunits in a 1:1:1:1 ratio. The alpha-1 subunit has 24 transmembrane segments and forms the pore through which ions pass into the cell. There are multiple isoforms of each of the proteins in the complex, either encoded by different genes or the result of alternative splicing of transcripts. Alternate transcriptional splice variants, encoding different isoforms, have been characterized for the gene described here. Studies suggest certain mutations in this gene lead to childhood absence epilepsy (CAE). [provided by RefSeq, Jul 2008]

CACNA1H Gene-Disease associations (from GenCC):

• hyperaldosteronism, familial, type IV

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• childhood absence epilepsy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• epilepsy, childhood absence, susceptibility to, 6

  Inheritance: AD Classification: LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.59).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_021098.3. 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
	CACNA1H	NM_021098.3	MANE Select	c.801C>G	p.Val267Val	splice_region synonymous	Exon 6 of 35	NP_066921.2
	CACNA1H	NM_001005407.2		c.801C>G	p.Val267Val	splice_region synonymous	Exon 6 of 34	NP_001005407.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA1H	ENST00000348261.11	TSL:1 MANE Select	c.801C>G	p.Val267Val	splice_region synonymous	Exon 6 of 35	ENSP00000334198.7
	CACNA1H	ENST00000569107.6	TSL:1	c.801C>G	p.Val267Val	splice_region synonymous	Exon 6 of 34	ENSP00000454990.2
	CACNA1H	ENST00000711493.1		c.801C>G	p.Val267Val	splice_region synonymous	Exon 6 of 34	ENSP00000518778.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1457296 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 724978

African (AFR) AF: 0.00 AC: 0 AN: 33442

American (AMR) AF: 0.00 AC: 0 AN: 44402

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26054

East Asian (EAS) AF: 0.00 AC: 0 AN: 39650

South Asian (SAS) AF: 0.00 AC: 0 AN: 86158

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50934

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 9.00e-7 AC: 1 AN: 1110632

Other (OTH) AF: 0.00 AC: 0 AN: 60262

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.59
CADD	Benign	15
DANN	Benign	0.83
PhyloP100		0.47

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0093
dbscSNV1_RF	Benign	0.24
SpliceAI score (max)		0.21		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.21		Position offset: -3

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

Other links and lift over

dbSNP: rs372726042; hg19: chr16-1248772;