21-33403544-A-C

Position:

• chr21-33403544-A-C

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_005534.4(IFNGR2):​c.1A>C​(p.Met1?) variant causes a start lost 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. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: IFNGR2 NM_005534.4 start_lost
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.539

Genes affected

IFNGR2 (HGNC:5440): (interferon gamma receptor 2) This gene (IFNGR2) encodes the non-ligand-binding beta chain of the gamma interferon receptor. Human interferon-gamma receptor is a heterodimer of IFNGR1 and IFNGR2. Defects in IFNGR2 are a cause of mendelian susceptibility to mycobacterial disease (MSMD), also known as familial disseminated atypical mycobacterial infection. MSMD is a genetically heterogeneous disease with autosomal recessive, autosomal dominant or X-linked inheritance. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 21-33403544-A-C is Pathogenic according to our data. Variant chr21-33403544-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1066015.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
IFNGR2	NM_005534.4	c.1A>C	p.Met1?	start_lost	1/7	ENST00000290219.11	NP_005525.2
IFNGR2	NM_001329128.2	c.1A>C	p.Met1?	start_lost	1/8		NP_001316057.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
IFNGR2	ENST00000290219.11	c.1A>C	p.Met1?	start_lost	1/7	1	NM_005534.4	ENSP00000290219	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Immunodeficiency 28 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 10, 2022

This sequence change affects the initiator methionine of the IFNGR2 mRNA. The next in-frame methionine is located at codon 80. This variant is not present in population databases (gnomAD no frequency). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Experimental studies have shown that disruption of the initiator codon affects IFNGR2 function (PMID: 31222290). Algorithms developed to predict the effect of variants on protein structure and function are not available or were not evaluated for this variant. ClinVar contains an entry for this variant (Variation ID: 1066015). Disruption of the initiator codon has been observed in individual(s) with Mendelian susceptibility to mycobacterial disease (MSMD) (PMID: 31222290). It has also been observed to segregate with disease in related individuals. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.16	D
BayesDel_noAF	Uncertain	0.0
CADD	Benign	21
DANN	Benign	0.82
DEOGEN2	Benign	0.085	T;.
Eigen	Benign	-0.42
Eigen_PC	Benign	-0.46
FATHMM_MKL	Benign	0.13	N
LIST_S2	Uncertain	0.90	D;D
M_CAP	Pathogenic	0.56	D
MetaRNN	Pathogenic	0.97	D;D
MetaSVM	Benign	-0.93	T
MutationTaster	Benign	1.0	D;D;D
PROVEAN	Benign	-0.83	N;N
REVEL	Benign	0.28
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.27	B;B
Vest4		0.64
MutPred		0.87		Loss of helix (P = 0.1706);Loss of helix (P = 0.1706);
MVP		0.94
ClinPred		0.99	D
GERP RS		1.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.93
gMVP		0.41

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: rs1316638883; hg19: chr21-34775850;