11-72000010-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001039660.2(IL18BP):c.26C>G(p.Pro9Arg) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000062 in 1,613,804 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/23 in silico tools predict 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 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: IL18BP NM_001039660.2 missense, splice_region
• Scores: Splicing: ADA: 0.002276
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.491

Genes affected

IL18BP (HGNC:5987): (interleukin 18 binding protein) The protein encoded by this gene functions as an inhibitor of the proinflammatory cytokine, IL18. It binds IL18, prevents the binding of IL18 to its receptor, and thus inhibits IL18-induced IFN-gamma production, resulting in reduced T-helper type 1 immune responses. This protein is constitutively expressed and secreted in mononuclear cells. Elevated level of this protein is detected in the intestinal tissues of patients with Crohn's disease. Alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Feb 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.25139257).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IL18BP	NM_001039660.2	c.26C>G	p.Pro9Arg	missense_variant, splice_region_variant	2/6	ENST00000393703.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IL18BP	ENST00000393703.9	c.26C>G	p.Pro9Arg	missense_variant, splice_region_variant	2/6	3	NM_001039660.2	P1

Frequencies

GnomAD3 genomes AF: 0.0000131 AC: 2 AN: 152234 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

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: 0.0000294

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000547 AC: 8 AN: 1461570 Hom.: 0 Cov.: 30 AF XY: 0.00000550 AC XY: 4 AN XY: 727106

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: 0.00000540

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome AF: 0.0000131 AC: 2 AN: 152234 Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1 AN XY: 74370

Gnomad4 AFR AF: 0.00

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: 0.0000294

Gnomad4 OTH AF: 0.00

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 22, 2023

This sequence change replaces proline, which is neutral and non-polar, with arginine, which is basic and polar, at codon 9 of the IL18BP protein (p.Pro9Arg). This variant is present in population databases (rs199757051, gnomAD 0.007%). This variant has not been reported in the literature in individuals affected with IL18BP-related conditions. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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	0.11
BayesDel_addAF	Benign	-0.078	T
BayesDel_noAF	Benign	-0.35
Cadd	Benign	21
Dann	Uncertain	1.0
DEOGEN2	Benign	0.089	T;T;T;T;.;T;T;T;.
Eigen	Benign	0.15
Eigen_PC	Benign	0.022
FATHMM_MKL	Benign	0.59	D
M_CAP	Benign	0.0074	T
MetaRNN	Benign	0.25	T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.7	L;.;L;L;L;.;L;L;L
MutationTaster	Benign	0.99	N;N;N;N;N;N;N;N
PrimateAI	Benign	0.31	T
PROVEAN	Uncertain	-3.6	D;D;D;D;.;D;D;D;D
REVEL	Benign	0.13
Sift	Uncertain	0.0050	D;D;D;D;.;D;D;D;D
Sift4G	Uncertain	0.0060	D;D;D;D;D;D;D;D;D
Polyphen		0.99	D;D;D;D;.;D;D;D;D
Vest4		0.43
MutPred		0.34		Gain of MoRF binding (P = 4e-04);Gain of MoRF binding (P = 4e-04);Gain of MoRF binding (P = 4e-04);Gain of MoRF binding (P = 4e-04);Gain of MoRF binding (P = 4e-04);Gain of MoRF binding (P = 4e-04);Gain of MoRF binding (P = 4e-04);Gain of MoRF binding (P = 4e-04);Gain of MoRF binding (P = 4e-04);
MVP		0.50
MPC		0.19
ClinPred		0.94	D
GERP RS		2.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.1
Varity_R		0.20
gMVP		0.32

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0023
dbscSNV1_RF	Benign	0.040
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: rs199757051; hg19: chr11-71711056;