chr16-1208118-C-T

Variant names:

• chr16-1208118-C-T
• rs772383239
• NM_021098.3:c.3260C>T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_021098.3(CACNA1H):​c.3260C>T​(p.Thr1087Ile) variant causes a missense change. The variant allele was found at a frequency of 0.00000277 in 1,441,580 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000028 (0 hom.)
• Consequence: CACNA1H NM_021098.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 3.77

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.29593372).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CACNA1H	NM_021098.3	c.3260C>T	p.Thr1087Ile	missense_variant	Exon 16 of 35	ENST00000348261.11	NP_066921.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CACNA1H	ENST00000348261.11	c.3260C>T	p.Thr1087Ile	missense_variant	Exon 16 of 35	1	NM_021098.3	ENSP00000334198.7
CACNA1H	ENST00000565831.6	c.3260C>T	p.Thr1087Ile	missense_variant	Exon 15 of 33	1		ENSP00000455840.1
CACNA1H	ENST00000638323.1	c.3221C>T	p.Thr1074Ile	missense_variant	Exon 16 of 35	5		ENSP00000492267.1
CACNA1H	ENST00000639478.1	n.3260C>T		non_coding_transcript_exon_variant	Exon 16 of 35	5		ENSP00000491945.1
CACNA1H	ENST00000640028.1	n.*1173C>T		non_coding_transcript_exon_variant	Exon 16 of 35	5		ENSP00000491488.1
CACNA1H	ENST00000640028.1	n.*1173C>T		3_prime_UTR_variant	Exon 16 of 35	5		ENSP00000491488.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000277 AC: 4 AN: 1441580 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 715354

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000471

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000181

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000151

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.00 AC: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Idiopathic generalized epilepsy;C4310756:Hyperaldosteronism, familial, type IV Uncertain:1

Jun 20, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 1087 of the CACNA1H protein (p.Thr1087Ile). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with CACNA1H-related conditions. ClinVar contains an entry for this variant (Variation ID: 582913). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt CACNA1H protein function with a negative predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not provided Uncertain:1

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Uncertain	0.034	T
BayesDel_noAF	Benign	-0.19
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.15	T;.;.;.
Eigen	Uncertain	0.37
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.89	D;D;D;.
M_CAP	Uncertain	0.11	D
MetaRNN	Benign	0.30	T;T;T;T
MetaSVM	Uncertain	0.11	D
MutationAssessor	Benign	1.9	L;.;L;L
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-1.4	N;.;N;N
REVEL	Benign	0.26
Sift	Benign	0.16	T;.;T;T
Sift4G	Benign	0.11	T;.;T;T
Polyphen		0.84	P;.;D;D
Vest4		0.61
MutPred		0.21		Loss of glycosylation at T1087 (P = 0.0039);.;Loss of glycosylation at T1087 (P = 0.0039);Loss of glycosylation at T1087 (P = 0.0039);
MVP		0.85
ClinPred		0.81	D
GERP RS		4.0
Varity_R		0.15
gMVP		0.45

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

Publications

LitVar

Other links and lift over

dbSNP: rs772383239; hg19: chr16-1258118;