1-247424426-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM5 PP2 BP4_Moderate

The NM_001243133.2(NLRP3):c.977G>T(p.Gly326Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,860 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G326A) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: NLRP3 NM_001243133.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.17

Genes affected

NLRP3 (HGNC:16400): (NLR family pyrin domain containing 3) This gene encodes a pyrin-like protein containing a pyrin domain, a nucleotide-binding site (NBS) domain, and a leucine-rich repeat (LRR) motif. This protein interacts with the apoptosis-associated speck-like protein PYCARD/ASC, which contains a caspase recruitment domain, and is a member of the NLRP3 inflammasome complex. This complex functions as an upstream activator of NF-kappaB signaling, and it plays a role in the regulation of inflammation, the immune response, and apoptosis. The SARS-CoV 3a protein, a transmembrane pore-forming viroporin, has been shown to activate the NLRP3 inflammasome via the formation of ion channels in macrophages. Mutations in this gene are associated with familial cold autoinflammatory syndrome (FCAS), Muckle-Wells syndrome (MWS), chronic infantile neurological cutaneous and articular (CINCA) syndrome, neonatal-onset multisystem inflammatory disease (NOMID), keratoendotheliitis fugax hereditarian, and deafness, autosomal dominant 34, with or without inflammation. Multiple alternatively spliced transcript variants encoding distinct isoforms have been identified for this gene. Alternative 5' UTR structures are suggested by available data; however, insufficient evidence is available to determine if all of the represented 5' UTR splice patterns are biologically valid. [provided by RefSeq, Aug 2020]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-247424426-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 97992.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP2: Missense variant where missense usually causes diseases, NLRP3
• BP4: Computational evidence support a benign effect (MetaRNN=0.145361).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NLRP3	NM_001243133.2	c.977G>T	p.Gly326Val	missense_variant	4/10	ENST00000336119.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NLRP3	ENST00000336119.8	c.977G>T	p.Gly326Val	missense_variant	4/10	1	NM_001243133.2	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461860 Hom.: 0 Cov.: 42 AF XY: 0.00000413 AC XY: 3 AN XY: 727234

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: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cryopyrin associated periodic syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 05, 2022

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. This variant disrupts the p.Gly328 amino acid residue in NLRP3. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 15724022, 24773462, 30338413). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0". The valine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. ClinVar contains an entry for this variant (Variation ID: 957963). This variant has not been reported in the literature in individuals affected with NLRP3-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 328 of the NLRP3 protein (p.Gly328Val). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.031	T
BayesDel_noAF	Benign	-0.28
Cadd	Benign	14
Dann	Benign	0.82
Eigen	Benign	-0.87
Eigen_PC	Benign	-0.69
FATHMM_MKL	Benign	0.16	N
LIST_S2	Benign	0.82	T;.;T;T;.;T;T;T
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.15	T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.91	T
MutationTaster	Benign	0.96	N;N;N;N;N;N
PrimateAI	Benign	0.36	T
PROVEAN	Benign	2.4	N;N;N;N;N;.;.;N
REVEL	Benign	0.26
Sift	Benign	0.24	T;T;T;T;T;.;.;T
Sift4G	Benign	0.19	T;T;T;T;T;.;.;T
Polyphen		0.033	B;B;B;B;B;.;.;B
Vest4		0.34
MutPred		0.56		Loss of methylation at K324 (P = 0.1058);Loss of methylation at K324 (P = 0.1058);Loss of methylation at K324 (P = 0.1058);Loss of methylation at K324 (P = 0.1058);Loss of methylation at K324 (P = 0.1058);Loss of methylation at K324 (P = 0.1058);Loss of methylation at K324 (P = 0.1058);Loss of methylation at K324 (P = 0.1058);
MVP		0.71
MPC		1.5
ClinPred		0.30	T
GERP RS		3.1
Varity_R		0.13
gMVP		0.74

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: rs180177456; hg19: chr1-247587728;