chr1-247424363-T-C

Variant names:

• chr1-247424363-T-C
• rs180177431
• NM_001243133.2:c.914T>C

Variant summary

Our verdict is Pathogenic. Variant got 17 ACMG points: 17P and 0B. PM1 PM2 PP2 PP3_Strong PP5_Very_Strong

The NM_001243133.2(NLRP3):​c.914T>C​(p.Leu305Pro) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: NLRP3 NM_001243133.2 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3 O:1
• Conservation: PhyloP100: 5.06

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 Pathogenic. Variant got 17 ACMG points.

• PM1: In a hotspot region, there are 7 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 8 uncertain in NM_001243133.2
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the NLRP3 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 55 curated pathogenic missense variants (we use a threshold of 10). The gene has 10 curated benign missense variants. Gene score misZ: 2.1417 (below the threshold of 3.09). Trascript score misZ: 3.5037 (above the threshold of 3.09). GenCC associations: The gene is linked to familial cold autoinflammatory syndrome, keratitis fugax hereditaria, cryopyrin-associated periodic syndrome, Muckle-Wells syndrome, familial cold autoinflammatory syndrome 1, CINCA syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.985
• PP5: Variant 1-247424363-T-C is Pathogenic according to our data. Variant chr1-247424363-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 97982.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-247424363-T-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NLRP3	NM_001243133.2	c.914T>C	p.Leu305Pro	missense_variant	Exon 4 of 10	ENST00000336119.8	NP_001230062.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NLRP3	ENST00000336119.8	c.914T>C	p.Leu305Pro	missense_variant	Exon 4 of 10	1	NM_001243133.2	ENSP00000337383.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 43

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Cryopyrin associated periodic syndrome Pathogenic:1

Jan 28, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt NLRP3 protein function. This sequence change replaces leucine with proline at codon 307 of the NLRP3 protein (p.Leu307Pro). The leucine residue is highly conserved and there is a moderate physicochemical difference between leucine and proline. This variant is not present in population databases (ExAC no frequency). This variant has been observed in individual(s) with familial cold autoinflammatory syndrome (PMID: 12355493, 17393462, 20131270, 15593220). It has also been observed to segregate with disease in related individuals. This variant is also called L305P in the literature. ClinVar contains an entry for this variant (Variation ID: 97982). -

not provided Pathogenic:1

Jan 05, 2021

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed in large population cohorts (Lek et al., 2016); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 22230390, 17393462, 12355493, 15593220, 25653548, 20131270, 27314497, 25407006) -

Autoinflammatory syndrome Pathogenic:1

Sep 28, 2021

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Familial cold autoinflammatory syndrome 1 Other:1

-

Unité médicale des maladies autoinflammatoires, CHRU Montpellier

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.31
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.78	.;D;D;.;.;.;.;.
Eigen	Uncertain	0.46
Eigen_PC	Uncertain	0.35
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Uncertain	0.91	D;.;D;D;.;D;D;D
M_CAP	Pathogenic	0.36	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.36	D
PrimateAI	Uncertain	0.57	T
PROVEAN	Pathogenic	-5.6	D;D;D;D;D;.;.;D
REVEL	Pathogenic	0.81
Sift	Pathogenic	0.0	D;D;D;D;D;.;.;D
Sift4G	Pathogenic	0.0	D;D;D;D;D;.;.;D
Polyphen		0.98	D;D;D;D;D;.;.;D
Vest4		0.85
MutPred		0.88		Gain of disorder (P = 0.0315);Gain of disorder (P = 0.0315);Gain of disorder (P = 0.0315);Gain of disorder (P = 0.0315);Gain of disorder (P = 0.0315);Gain of disorder (P = 0.0315);Gain of disorder (P = 0.0315);Gain of disorder (P = 0.0315);
MVP		0.98
MPC		1.7
ClinPred		1.0	D
GERP RS		4.0
Varity_R		0.95
gMVP		0.97

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: rs180177431; hg19: chr1-247587665;