rs1555878402

Positions:

• chr21-33403608-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_005534.4(IFNGR2):​c.65C>T​(p.Ala22Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000165 in 1,215,246 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000016 (0 hom.)
• Consequence: IFNGR2 NM_005534.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.434

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 Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.060047716).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
IFNGR2	NM_005534.4	c.65C>T	p.Ala22Val	missense_variant	1/7	ENST00000290219.11	NP_005525.2
IFNGR2	NM_001329128.2	c.65C>T	p.Ala22Val	missense_variant	1/8		NP_001316057.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
IFNGR2	ENST00000290219.11	c.65C>T	p.Ala22Val	missense_variant	1/7	1	NM_005534.4	ENSP00000290219	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000165 AC: 2 AN: 1215246 Hom.: 0 Cov.: 31 AF XY: 0.00000168 AC XY: 1 AN XY: 595450

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000380

Gnomad4 SAS exome AF: 0.0000178

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Immunodeficiency 28 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 22, 2020

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. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Unknown"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with IFNGR2-related disease. While this variant is not present in population databases, the frequency information is unreliable, as metrics indicate poor data quality at this position in the ExAC database. This sequence change replaces alanine with valine at codon 22 of the IFNGR2 protein (p.Ala22Val). The alanine residue is weakly conserved and there is a small physicochemical difference between alanine and valine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.43
CADD	Benign	10
DANN	Benign	0.87
DEOGEN2	Benign	0.085	T;.
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.5
FATHMM_MKL	Benign	0.011	N
LIST_S2	Benign	0.34	T;T
M_CAP	Benign	0.035	D
MetaRNN	Benign	0.060	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.49	N;.
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.46	T
PROVEAN	Benign	0.11	N;N
REVEL	Benign	0.056
Sift	Benign	0.32	T;T
Sift4G	Benign	0.31	T;T
Polyphen		0.0	B;B
Vest4		0.14
MutPred		0.34		Gain of sheet (P = 0.0266);Gain of sheet (P = 0.0266);
MVP		0.47
MPC		0.40
ClinPred		0.15	T
GERP RS		-0.83
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.0
Varity_R		0.055
gMVP		0.30

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: rs1555878402; hg19: chr21-34775914;