NM_000206.3:c.821T>C

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM1_StrongPM2_Supporting

This summary comes from the ClinGen Evidence Repository: The NM_000206.3(IL2RG):c.821T>C (p.Ile274Thr) is a missense variant that has been reported in ClinVar, without patient information, however it has not been reported in the literature to our knowledge. This variant introduces a polar residue within the transmembrane region (amino acids 263-283) of IL2RG, which is defined as a critical functional domain by the ClinGen SCID VCEP (PM1_Strong).The filtering allele frequency (the upper threshold of the 95% CI of 2/70896) of the c.821T>C variant in IL2RG is 0.000004680 for European (non- Finnish) chromosomes by gnomAD v2.1.1, which is lower than the ClinGen SCID VCEP threshold (<0.000124; PM2_Supporting). In summary, this variant is classified as uncertain significance due to insufficient information. Criteria applied: PM1_strong and PM2_supporting (VCEP specifications version 1). LINK:https://erepo.genome.network/evrepo/ui/classification/CA10443808/MONDO:0010315/129

Frequency

Genomes: 𝑓 0.000027 ( 0 hom., 1 hem., cov: 23)

Exomes 𝑓: 0.0000083 ( 0 hom. 6 hem. )

Consequence

IL2RG
NM_000206.3 missense

Scores

Clinical Significance

Uncertain significance reviewed by expert panel U:8

Conservation

PhyloP100: 4.18

Publications

1 publications found

Variant links:

Genes affected

IL2RG (HGNC:6010): (interleukin 2 receptor subunit gamma) The protein encoded by this gene is an important signaling component of many interleukin receptors, including those of interleukin -2, -4, -7 and -21, and is thus referred to as the common gamma chain. Mutations in this gene cause X-linked severe combined immunodeficiency (XSCID), as well as X-linked combined immunodeficiency (XCID), a less severe immunodeficiency disorder. [provided by RefSeq, Mar 2010]

IL2RG Gene-Disease associations (from GenCC):

T-B+ severe combined immunodeficiency due to gamma chain deficiency
Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Orphanet, Ambry Genetics, Myriad Women’s Health
Omenn syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

IL2RG links:

ENSG00000285171 (HGNC:):

ENSG00000285171 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

PM1

For more information check the summary or visit ClinGen Evidence Repository.

PM2

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IL2RG	NM_000206.3 link	c.821T>C	p.Ile274Thr	missense_variant	Exon 6 of 8	ENST00000374202.7	NP_000197.1
IL2RG	NM_001438870.1 link	c.758-286T>C		intron_variant	Intron 5 of 6		NP_001425799.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IL2RG	ENST00000374202.7 link	c.821T>C	p.Ile274Thr	missense_variant	Exon 6 of 8	1	NM_000206.3	ENSP00000363318.3
ENSG00000285171	ENST00000646505.1 link	n.821T>C		non_coding_transcript_exon_variant	Exon 6 of 12			ENSP00000496673.1

Frequencies

GnomAD3 genomes

AF:

0.0000267

AC:

AN:

112507

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000563

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000122

AC:

AN:

163372

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000282

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000831

AC:

AN:

1083366

Hom.:

Cov.:

AF XY:

0.0000170

AC XY:

AN XY:

353146

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

25531

American (AMR)

AF:

0.00

AC:

AN:

34771

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19283

East Asian (EAS)

AF:

0.00

AC:

AN:

28894

South Asian (SAS)

AF:

0.00

AC:

AN:

52085

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40081

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4122

European-Non Finnish (NFE)

AF:

0.0000108

AC:

AN:

833061

Other (OTH)

AF:

0.00

AC:

AN:

45538

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000267

AC:

AN:

112507

Hom.:

Cov.:

AF XY:

0.0000288

AC XY:

AN XY:

34663

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30943

American (AMR)

AF:

0.00

AC:

AN:

10601

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2658

East Asian (EAS)

AF:

0.00

AC:

AN:

3614

South Asian (SAS)

AF:

0.00

AC:

AN:

2748

European-Finnish (FIN)

AF:

0.00

AC:

AN:

6189

Middle Eastern (MID)

AF:

0.00

AC:

AN:

239

European-Non Finnish (NFE)

AF:

0.0000563

AC:

AN:

53308

Other (OTH)

AF:

0.00

AC:

AN:

1518

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000142

Hom.:

Bravo

AF:

0.0000264

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000149

AC:

ExAC

AF:

0.00000831

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:8

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

X-linked severe combined immunodeficiency

Uncertain:3

Nov 14, 2023

ClinGen Severe Combined Immunodeficiency Variant Curation Expert Panel, ClinGen

Significance:Uncertain significance

Review Status:reviewed by expert panel

Collection Method:curation

The NM_000206.3(IL2RG):c.821T>C (p.Ile274Thr) is a missense variant that has been reported in ClinVar, without patient information, however it has not been reported in the literature to our knowledge. This variant introduces a polar residue within the transmembrane region (amino acids 263-283) of IL2RG, which is defined as a critical functional domain by the ClinGen SCID VCEP (PM1_Strong). The filtering allele frequency (the upper threshold of the 95% CI of 2/70896) of the c.821T>C variant in IL2RG is 0.000004680 for European (non- Finnish) chromosomes by gnomAD v2.1.1, which is lower than the ClinGen SCID VCEP threshold (<0.000124; PM2_Supporting). In summary, this variant is classified as uncertain significance due to insufficient information. Criteria applied: PM1_strong and PM2_supporting (VCEP specifications version 1). -

Aug 28, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 274 of the IL2RG protein (p.Ile274Thr). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with IL2RG-related conditions. ClinVar contains an entry for this variant (Variation ID: 532191). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt IL2RG 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. -

Oct 28, 2019

Natera, Inc.

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

not provided

Uncertain:3

Jul 14, 2017

Blueprint Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Feb 09, 2022

Greenwood Genetic Center Diagnostic Laboratories, Greenwood Genetic Center

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PM2 -

Jan 21, 2025

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis indicates that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

IL2RG-related disorder

Uncertain:1

Jan 24, 2023

PreventionGenetics, part of Exact Sciences

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The IL2RG c.821T>C variant is predicted to result in the amino acid substitution p.Ile274Thr. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.0028% of alleles in individuals of European (Non-Finnish) descent in gnomAD (http://gnomad.broadinstitute.org/variant/X-70328482-A-G). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Inborn genetic diseases

Uncertain:1

Nov 22, 2022

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.821T>C (p.I274T) alteration is located in exon 6 (coding exon 6) of the IL2RG gene. This alteration results from a T to C substitution at nucleotide position 821, causing the isoleucine (I) at amino acid position 274 to be replaced by a threonine (T). 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

0.26

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Uncertain

0.070

CADD

Benign

(source)

DANN

Benign

0.96

DEOGEN2

Uncertain

0.64

D;.

FATHMM_MKL

Benign

0.75

LIST_S2

Benign

0.66

T;T

M_CAP

Pathogenic

0.35

MetaRNN

Uncertain

0.72

D;D

MetaSVM

Uncertain

0.59

MutationAssessor

Uncertain

2.5

M;.

PhyloP100

4.2

PrimateAI

Benign

0.45

PROVEAN

Benign

-2.1

N;N

REVEL

Uncertain

0.44

Sift

Uncertain

0.0040

D;T

Sift4G

Uncertain

0.0060

D;D

Polyphen

0.65

P;.

Vest4

0.52

MVP

0.97

MPC

1.3

ClinPred

0.82

GERP RS

4.9

Varity_R

0.14

gMVP

0.87

Mutation Taster

=93/7

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over