chrX-71110904-G-GCAGA

Variant names:

• chrX-71110904-G-GCAGA
• rs1556330940
• NM_000206.3:c.258_261dupTCTG

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000206.3(IL2RG):​c.258_261dupTCTG​(p.His88SerfsTer10) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. L87L) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay. The gene IL2RG is included in the ClinGen Criteria Specification Registry.

• Frequency: Genomes: not found (cov: 22)
• Consequence: IL2RG NM_000206.3 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 1.98
• Publications: 0 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

Specifications for IL2RG are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-71110904-G-GCAGA is Pathogenic according to our data. Variant chrX-71110904-G-GCAGA is described in ClinVar as Pathogenic. ClinVar VariationId is 445479.Status of the report is criteria_provided_single_submitter, 1 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.258_261dupTCTG	p.His88SerfsTer10	frameshift	Exon 2 of 8	NP_000197.1	P31785-1
	IL2RG	NM_001438870.1		c.258_261dupTCTG	p.His88SerfsTer10	frameshift	Exon 2 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.258_261dupTCTG	p.His88SerfsTer10	frameshift	Exon 2 of 8	ENSP00000363318.3	P31785-1
	ENSG00000285171	ENST00000646505.1		n.258_261dupTCTG		non_coding_transcript_exon	Exon 2 of 12	ENSP00000496673.1	A0A2R8YE73
	IL2RG	ENST00000482750.6	TSL:5	c.258_261dupTCTG	p.His88SerfsTer10	frameshift	Exon 2 of 7	ENSP00000421262.2	H0Y8J6

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 22

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.0
Mutation Taster		=2/198	disease causing (ClinVar)

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1556330940; hg19: chrX-70330754;