Genetic Variant ORAI1:p.Met1? (chr12-121626743-A-C) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PVS1_ModeratePM2

The ENST00000617316.2(ORAI1):c.1A>C(p.Met1?) variant causes a initiator codon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000025 in 1,198,654 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000067 ( 0 hom., cov: 30)

Exomes 𝑓: 0.0000019 ( 0 hom. )

Consequence

ORAI1
ENST00000617316.2 initiator_codon

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.102

Variant links:

Genes affected

ORAI1 (HGNC:25896): (ORAI calcium release-activated calcium modulator 1) The protein encoded by this gene is a membrane calcium channel subunit that is activated by the calcium sensor STIM1 when calcium stores are depleted. This type of channel is the primary way for calcium influx into T-cells. Defects in this gene are a cause of immune dysfunction with T-cell inactivation due to calcium entry defect type 1 (IDTICED1). [provided by RefSeq, Sep 2011]

ORAI1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PVS1

Start lost variant, next in-frame start position is after 1 pathogenic variants. Next in-frame start position is after 64 codons. Genomic position: 121626937. Lost 0.210 part of the original CDS.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ORAI1	NR_186857.1 link	n.214A>C		non_coding_transcript_exon_variant	Exon 1 of 2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	Protein	UniProt
ORAI1	ENST00000617316.2 link	c.1A>C	p.Met1?	initiator_codon_variant	Exon 1 of 3	1	ENSP00000482568.2	Q96D31-1
ORAI1	ENST00000646827.1 link	n.194A>C		non_coding_transcript_exon_variant	Exon 1 of 2
ORAI1	ENST00000698901.1 link	n.235A>C		non_coding_transcript_exon_variant	Exon 1 of 2
ORAI1	ENST00000611718.1 link	n.-73A>C		upstream_gene_variant		5

Frequencies

GnomAD3 genomes

AF:

0.00000670

AC:

AN:

149262

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000244

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000191

AC:

AN:

1049392

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

499478

show subpopulations

Gnomad4 AFR exome

AF:

0.0000481

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000670

AC:

AN:

149262

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

72804

show subpopulations

Gnomad4 AFR

AF:

0.0000244

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Combined immunodeficiency due to ORAI1 deficiency;C4014557:Myopathy, tubular aggregate, 2

Uncertain:1

Dec 17, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects the initiator methionine of the ORAI1 mRNA. The next in-frame methionine is located at codon 64. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with ORAI1-related conditions. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.28

BayesDel_noAF

Pathogenic

0.16

CADD

Benign

DANN

Benign

0.74

DEOGEN2

Benign

0.069

Eigen

Benign

-0.42

Eigen_PC

Benign

-0.31

FATHMM_MKL

Benign

0.15

LIST_S2

Uncertain

0.90

M_CAP

Pathogenic

0.86

MetaRNN

Pathogenic

0.95

MetaSVM

Benign

-1.1

Polyphen

0.0

MutPred

0.96

Gain of catalytic residue at M1 (P = 2e-04);

ClinPred

0.87

GERP RS

2.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Varity_R

0.43

gMVP

0.50

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over