chr16-1219003-A-C

Variant names:

• chr16-1219003-A-C
• rs3751886
• NM_021098.3:c.5921A>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_021098.3(CACNA1H):​c.5921A>C​(p.Glu1974Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E1974G) has been classified as Benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: CACNA1H NM_021098.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.692
• Publications: 14 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: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17659071).

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.5921A>C	p.Glu1974Ala	missense	Exon 34 of 35	NP_066921.2
	CACNA1H	NM_001005407.2		c.5903A>C	p.Glu1968Ala	missense	Exon 33 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.5921A>C	p.Glu1974Ala	missense	Exon 34 of 35	ENSP00000334198.7
	CACNA1H	ENST00000569107.6	TSL:1	c.5936A>C	p.Glu1979Ala	missense	Exon 33 of 34	ENSP00000454990.2
	CACNA1H	ENST00000565831.7	TSL:1	c.5903A>C	p.Glu1968Ala	missense	Exon 33 of 34	ENSP00000455840.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

Alfa AF: 0.00 Hom.: 185

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.084
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Benign	17
DANN	Benign	0.83
DEOGEN2	Uncertain	0.55	D
Eigen	Benign	-0.71
Eigen_PC	Benign	-0.72
FATHMM_MKL	Benign	0.44	N
LIST_S2	Benign	0.71	T
M_CAP	Pathogenic	0.47	D
MetaRNN	Benign	0.18	T
MetaSVM	Uncertain	0.41	D
PhyloP100		0.69
PrimateAI	Benign	0.44	T
PROVEAN	Uncertain	-3.2	D
REVEL	Benign	0.20
Sift	Benign	0.053	T
Sift4G	Benign	0.22	T
Polyphen		0.0010	B
Vest4		0.19
MutPred		0.17		Loss of solvent accessibility (P = 0.0159)
MVP		0.93
ClinPred		0.17	T
GERP RS		2.1
Varity_R		0.096
gMVP		0.35
Mutation Taster		=96/4	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.080		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: rs3751886; hg19: chr16-1269003;