Genetic Variant IL21:p.Ter163Argext*? (chr4-122612712-A-G) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PM4

The NM_021803.4(IL21):c.487T>C(p.Ter163Argext*?) variant causes a stop 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 benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

IL21
NM_021803.4 stop_lost

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.314

Variant links:

Genes affected

IL21 (HGNC:6005): (interleukin 21) This gene encodes a member of the common-gamma chain family of cytokines with immunoregulatory activity. The encoded protein plays a role in both the innate and adaptive immune responses by inducing the differentiation, proliferation and activity of multiple target cells including macrophages, natural killer cells, B cells and cytotoxic T cells. Dysregulation of this gene plays a role in multiple immune-mediated diseases including lupus, psoriasis and chronic inflammatory diseases. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Dec 2011]

IL21 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM4

Stoplost variant in NM_021803.4 Downstream stopcodon found after 55 codons.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IL21	NM_021803.4 link	c.487T>C	p.Ter163Argext*?	stop_lost	Exon 5 of 5	ENST00000648588.1	NP_068575.1	Q9HBE4-1A0A224B028
IL21	NM_001207006.3 link	c.*115T>C		3_prime_UTR_variant	Exon 4 of 4		NP_001193935.1	Q9HBE4-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
IL21	ENST00000648588.1 link	c.487T>C	p.Ter163Argext*?	stop_lost	Exon 5 of 5		NM_021803.4	ENSP00000497915.1	Q9HBE4-1
IL21	ENST00000611104.2 link	c.*115T>C		splice_region_variant	Exon 4 of 4	1		ENSP00000477555.1	Q9HBE4-2
IL21	ENST00000611104 link	c.*115T>C		3_prime_UTR_variant	Exon 4 of 4	1		ENSP00000477555.1	Q9HBE4-2
IL21	ENST00000647784.1 link	n.339T>C		non_coding_transcript_exon_variant	Exon 4 of 4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000399

AC:

AN:

250636

Hom.:

AF XY:

0.00000738

AC XY:

AN XY:

135524

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

1453446

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

723782

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Sep 25, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change disrupts the translational stop signal of the IL21 mRNA. It is expected to extend the length of the IL21 protein by 15 additional amino acid residues. This variant is present in population databases (rs750573471, gnomAD 0.003%). This variant has not been reported in the literature in individuals affected with IL21-related conditions. 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

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.73

CADD

Benign

7.9

DANN

Benign

0.50

Eigen

Benign

-0.058

Eigen_PC

Benign

-0.49

FATHMM_MKL

Benign

0.0090

Vest4

0.44

GERP RS

-6.8

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over