chr16-27430081-G-A

Position:

• chr16-27430081-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_181078.3(IL21R):​c.10G>A​(p.Gly4Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 12/21 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)
• Consequence: IL21R NM_181078.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.31

Genes affected

IL21R (HGNC:6006): (interleukin 21 receptor) The protein encoded by this gene is a cytokine receptor for interleukin 21 (IL21). It belongs to the type I cytokine receptors, and has been shown to form a heterodimeric receptor complex with the common gamma-chain, a receptor subunit also shared by the receptors for interleukin 2, 4, 7, 9, and 15. This receptor transduces the growth promoting signal of IL21, and is important for the proliferation and differentiation of T cells, B cells, and natural killer (NK) cells. The ligand binding of this receptor leads to the activation of multiple downstream signaling molecules, including JAK1, JAK3, STAT1, and STAT3. Knockout studies of a similar gene in mouse suggest a role for this gene in regulating immunoglobulin production. Three alternatively spliced transcript variants have been described. [provided by RefSeq, Jul 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
IL21R	NM_181078.3	c.10G>A	p.Gly4Ser	missense_variant	2/9	ENST00000337929.8	NP_851564.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
IL21R	ENST00000337929.8	c.10G>A	p.Gly4Ser	missense_variant	2/9	1	NM_181078.3	ENSP00000338010	P1
IL21R	ENST00000395754.4	c.10G>A	p.Gly4Ser	missense_variant	2/9	1		ENSP00000379103	P1
IL21R	ENST00000564089.5	c.10G>A	p.Gly4Ser	missense_variant	3/10	5		ENSP00000456707	P1
IL21R	ENST00000697146.1	c.10G>A	p.Gly4Ser	missense_variant, NMD_transcript_variant	1/7			ENSP00000513135

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cryptosporidiosis-chronic cholangitis-liver disease syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 08, 2022

This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 4 of the IL21R protein (p.Gly4Ser). This variant has not been reported in the literature in individuals affected with IL21R-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.38
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.078	T;T;T
Eigen	Benign	-0.024
Eigen_PC	Benign	-0.11
FATHMM_MKL	Benign	0.35	N
LIST_S2	Benign	0.51	.;.;T
M_CAP	Benign	0.026	D
MetaRNN	Uncertain	0.44	T;T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Uncertain	2.1	M;M;M
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	0.14	N;N;N
REVEL	Benign	0.13
Sift	Benign	0.34	T;T;T
Sift4G	Benign	0.061	T;T;T
Polyphen		0.96	D;D;D
Vest4		0.41
MutPred		0.13		Gain of glycosylation at P2 (P = 0.0562);Gain of glycosylation at P2 (P = 0.0562);Gain of glycosylation at P2 (P = 0.0562);
MVP		0.70
MPC		0.80
ClinPred		0.77	D
GERP RS		4.0
Varity_R		0.038
gMVP		0.75

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: rs1358493581; hg19: chr16-27441402;