X-71108278-G-T

Variant names:

• chrX-71108278-G-T
• rs137852509
• NM_000206.3:c.923C>A

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PVS1_Strong PM2 PP5

The NM_000206.3(IL2RG):​c.923C>A​(p.Ser308*) variant causes a stop gained, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. S308S) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 24)
  • Exomes 𝑓: 0.0 (0 hom. 0 hem.)
  • Failed GnomAD Quality Control
• Consequence: IL2RG NM_000206.3 stop_gained, splice_region
• Scores: Splicing: ADA: 0.1250
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 1.46
• Publications: 10 publications found

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: ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet, Myriad Women’s Health
• Omenn syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000285171 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. There are 10 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-71108278-G-T is Pathogenic according to our data. Variant chrX-71108278-G-T is described in ClinVar as Pathogenic. ClinVar VariationId is 10018.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000206.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IL2RG	NM_000206.3	MANE Select	c.923C>A	p.Ser308*	stop_gained splice_region	Exon 7 of 8	NP_000197.1	P31785-1
	IL2RG	NM_001438870.1		c.*43C>A		splice_region	Exon 6 of 7	NP_001425799.1
	IL2RG	NM_001438870.1		c.*43C>A		3_prime_UTR	Exon 6 of 7	NP_001425799.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IL2RG	ENST00000374202.7	TSL:1 MANE Select	c.923C>A	p.Ser308*	stop_gained splice_region	Exon 7 of 8	ENSP00000363318.3	P31785-1
	ENSG00000285171	ENST00000646505.1		n.923C>A		splice_region non_coding_transcript_exon	Exon 7 of 12	ENSP00000496673.1	A0A2R8YE73
	IL2RG	ENST00000482750.6	TSL:5	c.*43C>A		splice_region	Exon 6 of 7	ENSP00000421262.2	H0Y8J6

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1082718 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 350064

African (AFR) AF: 0.00 AC: 0 AN: 26092

American (AMR) AF: 0.00 AC: 0 AN: 35185

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19297

East Asian (EAS) AF: 0.00 AC: 0 AN: 30134

South Asian (SAS) AF: 0.00 AC: 0 AN: 53773

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40529

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4075

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 828019

Other (OTH) AF: 0.00 AC: 0 AN: 45614

GnomAD4 genome Cov.: 24

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	X-linked severe combined immunodeficiency (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.52	D
BayesDel_noAF	Pathogenic	0.50
CADD	Pathogenic	36
DANN	Uncertain	1.0
FATHMM_MKL	Uncertain	0.77	D
PhyloP100		1.5
Vest4		0.90
GERP RS		4.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.13
dbscSNV1_RF	Benign	0.41
Splicevardb		2.0
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

Other links and lift over

dbSNP: rs137852509; hg19: chrX-70328128;