chr2-203956771-C-G

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBS1_Supporting

The NM_012092.4(ICOS):c.501+6C>G variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000644 in 1,555,586 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00031 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00068 ( 1 hom. )

Consequence

ICOS
NM_012092.4 splice_region, intron

Scores

Splicing: ADA: 0.00005473

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3B:1

Conservation

PhyloP100: -0.636

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.87).

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000309 (47/151954) while in subpopulation NFE AF= 0.000632 (43/67986). AF 95% confidence interval is 0.000482. There are 0 homozygotes in gnomad4. There are 14 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	MANE	Protein	UniProt
ICOS	NM_012092.4 link	c.501+6C>G	splice_region_variant, intron_variant	Intron 3 of 4	ENST00000316386.11	NP_036224.1	Q9Y6W8-1Q53QY6
ICOS	XM_047444022.1 link	c.504+6C>G	splice_region_variant, intron_variant	Intron 3 of 4		XP_047299978.1
ICOS	XR_007073112.1 link	n.553+6C>G	splice_region_variant, intron_variant	Intron 3 of 5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ICOS	ENST00000316386.11 link	c.501+6C>G		splice_region_variant, intron_variant	Intron 3 of 4	1	NM_012092.4	ENSP00000319476.6		Q9Y6W8-1
ICOS	ENST00000435193.1 link	c.501+6C>G		splice_region_variant, intron_variant	Intron 3 of 3	1		ENSP00000415951.1		Q9Y6W8-2

Frequencies

GnomAD3 genomes

AF:

0.000309

AC:

AN:

151954

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000967

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000632

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000267

AC:

AN:

250604

Hom.:

AF XY:

0.000273

AC XY:

AN XY:

135426

show subpopulations

Gnomad AFR exome

AF:

0.000308

Gnomad AMR exome

AF:

0.0000581

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000139

Gnomad NFE exome

AF:

0.000503

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000680

AC:

955

AN:

1403632

Hom.:

Cov.:

AF XY:

0.000644

AC XY:

452

AN XY:

701924

show subpopulations

Gnomad4 AFR exome

AF:

0.000186

Gnomad4 AMR exome

AF:

0.0000673

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000750

Gnomad4 NFE exome

AF:

0.000880

Gnomad4 OTH exome

AF:

0.000171

GnomAD4 genome

AF:

0.000309

AC:

AN:

151954

Hom.:

Cov.:

AF XY:

0.000189

AC XY:

AN XY:

74210

show subpopulations

Gnomad4 AFR

AF:

0.0000967

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000632

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000239

Hom.:

360

EpiCase

AF:

0.000600

EpiControl

AF:

0.000594

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 02, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: ICOS c.501+6C>G alters a non-conserved nucleotide located close to a canonical splice site and therefore could affect mRNA splicing, leading to a significantly altered protein sequence. Consensus agreement among computation tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.00027 in 250604 control chromosomes (gnomAD). To our knowledge, no occurrence of c.501+6C>G in individuals affected with Immunodeficiency, Common Variable, 1 and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 624172). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Immunodeficiency, common variable, 1

Uncertain:1

Dec 23, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change falls in intron 3 of the ICOS gene. It does not directly change the encoded amino acid sequence of the ICOS protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs4264550, gnomAD 0.05%). This variant has not been reported in the literature in individuals affected with ICOS-related conditions. ClinVar contains an entry for this variant (Variation ID: 624172). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. 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. -

not provided

Uncertain:1

Apr 01, 2018

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

ICOS-related disorder

Benign:1

Apr 14, 2020

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.87

CADD

Benign

1.7

DANN

Benign

0.47

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000055

dbscSNV1_RF

Benign

0.028

SpliceAI score (max)

0.010

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