2-203936873-G-A

Position:

chr2-203936873-G-A

Variant summary

Our verdict is Pathogenic. Variant got 22 ACMG points: 22P and 0B. PVS1PM2PP3_StrongPP5_Very_Strong

The NM_012092.4(ICOS):c.58+1G>A variant causes a splice donor change. The variant allele was found at a frequency of 0.0000189 in 1,425,698 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.000019 ( 0 hom. )

Consequence

ICOS
NM_012092.4 splice_donor

Scores

Splicing: ADA: 1.000

Clinical Significance

Likely pathogenic criteria provided, multiple submitters, no conflicts P:2

Conservation

PhyloP100: 4.95

Variant links:

Genes affected

ICOS (HGNC:5351): (inducible T cell costimulator) The protein encoded by this gene belongs to the CD28 and CTLA-4 cell-surface receptor family. It forms homodimers and plays an important role in cell-cell signaling, immune responses, and regulation of cell proliferation. [provided by RefSeq, Jul 2008]

ICOS links:

LOC101927840 (HGNC:):

LOC101927840 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 22 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, Cryptic splice site detected, with MaxEntScore 3.5, offset of -41, new splice context is: ctgGTattt. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.

PM2

Very rare variant in population databases, with high coverage;

PP3

Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

PP5

Variant 2-203936873-G-A is Pathogenic according to our data. Variant chr2-203936873-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 663980.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	MANE
ICOS	NM_012092.4 linkuse as main transcript	c.58+1G>A	splice_donor_variant	ENST00000316386.11
LOC101927840	XR_427213.4 linkuse as main transcript	n.314+444C>T	intron_variant, non_coding_transcript_variant
ICOS	XR_007073112.1 linkuse as main transcript	n.110+1G>A	splice_donor_variant, non_coding_transcript_variant
ICOS	XM_047444022.1 linkuse as main transcript		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ICOS	ENST00000316386.11 linkuse as main transcript	c.58+1G>A		splice_donor_variant		1	NM_012092.4	P2	Q9Y6W8-1
ICOS	ENST00000435193.1 linkuse as main transcript	c.58+1G>A		splice_donor_variant		1		A2	Q9Y6W8-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000399

AC:

AN:

250398

Hom.:

AF XY:

0.00000738

AC XY:

AN XY:

135492

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:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000189

AC:

AN:

1425698

Hom.:

Cov.:

AF XY:

0.0000225

AC XY:

AN XY:

711698

show subpopulations

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:

0.0000250

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Immunodeficiency, common variable, 1

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 19, 2018

Donor and acceptor splice site variants typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in ICOS are known to be pathogenic (PMID: 11343122, 12577056, 19380800). 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. This variant has not been reported in the literature in individuals with ICOS-related disease. This variant is present in population databases (rs757598952, ExAC 0.002%). This sequence change affects a donor splice site in intron 1 of the ICOS gene. It is expected to disrupt RNA splicing and likely results in an absent or disrupted protein product. -

Inherited Immunodeficiency Diseases

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

research

NIHR Bioresource Rare Diseases, University of Cambridge

Jan 01, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.23

BayesDel_noAF

Uncertain

0.090

CADD

Pathogenic

DANN

Uncertain

0.99

Eigen

Pathogenic

0.99

Eigen_PC

Pathogenic

0.80

FATHMM_MKL

Uncertain

0.91

MutationTaster

Benign

1.0

D;D

GERP RS

5.6

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.77

SpliceAI score (max)

0.92

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.26

Position offset: -42

DS_DL_spliceai

0.92

Position offset: -1

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