chr17-50561541-G-T

Position:

• chr17-50561541-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_018896.5(CACNA1G):​c.82G>T​(p.Ala28Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000216 in 1,386,898 control chromosomes in the GnomAD database, with no homozygous occurrence. 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: not found (cov: 31)
  • Exomes 𝑓: 0.0000022 (0 hom.)
• Consequence: CACNA1G NM_018896.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.147

Genes affected

CACNA1G (HGNC:1394): (calcium voltage-gated channel subunit alpha1 G) Voltage-sensitive 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, gene expression, cell motility, cell division, and cell death. This gene encodes a T-type, low-voltage activated calcium channel. The T-type channels generate currents that are both transient, owing to fast inactivation, and tiny, owing to small conductance. T-type channels are thought to be involved in pacemaker activity, low-threshold calcium spikes, neuronal oscillations and resonance, and rebound burst firing. Many alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Sep 2011]

CACNA1G-AS1 (HGNC:27377): (CACNA1G antisense RNA 1)

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), CACNA1G. . Gene score misZ 4.6386 (greater than the threshold 3.09). Trascript score misZ 5.0317 (greater than threshold 3.09). GenCC has associacion of gene with intellectual disability, spinocerebellar ataxia type 42, spinocerebellar ataxia 42, early-onset, severe, with neurodevelopmental deficits.
• BP4: Computational evidence support a benign effect (MetaRNN=0.22829396).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CACNA1G	NM_018896.5	c.82G>T	p.Ala28Ser	missense_variant	1/38	ENST00000359106.10	NP_061496.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CACNA1G	ENST00000359106.10	c.82G>T	p.Ala28Ser	missense_variant	1/38	1	NM_018896.5	ENSP00000352011.5
CACNA1G	ENST00000507510.6	c.82G>T	p.Ala28Ser	missense_variant	1/37	1		ENSP00000423112.2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000216 AC: 3 AN: 1386898 Hom.: 0 Cov.: 32 AF XY: 0.00000438 AC XY: 3 AN XY: 684438

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000278

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 25, 2024

The c.82G>T (p.A28S) alteration is located in exon 1 (coding exon 1) of the CACNA1G gene. This alteration results from a G to T substitution at nucleotide position 82, causing the alanine (A) at amino acid position 28 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.082
BayesDel_addAF	Uncertain	0.074	D
BayesDel_noAF	Benign	-0.13
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.022	.;.;.;.;T;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;T;.
Eigen	Benign	-0.16
Eigen_PC	Benign	-0.11
FATHMM_MKL	Benign	0.67	D
LIST_S2	Uncertain	0.87	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.68	D
MetaRNN	Benign	0.23	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.49	D
MutationAssessor	Benign	1.1	L;L;L;L;.;L;L;L;L;L;L;L;L;L;L;L;L;L;L;L;L;L;L;L;L;L
PrimateAI	Pathogenic	0.81	D
PROVEAN	Benign	-0.46	N;N;N;N;N;N;N;N;N;N;N;N;N;N;N;N;N;N;N;N;N;N;N;N;N;N
REVEL	Uncertain	0.33
Sift	Benign	0.11	T;T;T;T;T;T;T;T;T;D;T;D;T;D;T;T;T;T;D;T;T;T;D;T;T;T
Sift4G	Benign	0.35	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
Polyphen		0.11, 1.0, 0.0	.;.;.;.;.;B;.;.;.;.;.;.;.;.;.;.;D;.;.;.;.;.;.;.;B;.
Vest4		0.13
MutPred		0.23		Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);Gain of phosphorylation at A28 (P = 0.0068);
MVP		0.80
MPC		1.1
ClinPred		0.16	T
GERP RS		2.8
Varity_R		0.064
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: rs1255435687; hg19: chr17-48638902;