1-247424912-G-C

Position:

• chr1-247424912-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PM5 PP2

The NM_001243133.2(NLRP3):​c.1463G>C​(p.Arg488Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R488K) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: NLRP3 NM_001243133.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.102

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 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-247424912-G-A is described in Lovd as [Pathogenic].
• PP2: Missense variant where missense usually causes diseases, NLRP3

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NLRP3	NM_001243133.2	c.1463G>C	p.Arg488Thr	missense_variant	4/10	ENST00000336119.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NLRP3	ENST00000336119.8	c.1463G>C	p.Arg488Thr	missense_variant	4/10	1	NM_001243133.2	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000400 AC: 1 AN: 249698 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135224

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: 0.00000882

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 38

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.15
CADD	Benign	22
DANN	Benign	0.97
Eigen	Benign	0.030
Eigen_PC	Benign	-0.14
FATHMM_MKL	Benign	0.19	N
LIST_S2	Uncertain	0.93	D;.;D;D;.;D;D;D
M_CAP	Pathogenic	0.31	D
MetaRNN	Uncertain	0.60	D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.40	D
MutationTaster	Benign	1.0	N;N;N;N;N;N
PrimateAI	Uncertain	0.51	T
PROVEAN	Pathogenic	-4.6	D;D;D;D;D;.;.;D
REVEL	Uncertain	0.51
Sift	Uncertain	0.0040	D;D;D;D;D;.;.;D
Sift4G	Uncertain	0.010	D;D;D;D;D;.;.;D
Polyphen		0.98	D;D;D;D;D;.;.;D
Vest4		0.53
MutPred		0.58		Loss of catalytic residue at R490 (P = 0.0479);Loss of catalytic residue at R490 (P = 0.0479);Loss of catalytic residue at R490 (P = 0.0479);Loss of catalytic residue at R490 (P = 0.0479);Loss of catalytic residue at R490 (P = 0.0479);Loss of catalytic residue at R490 (P = 0.0479);Loss of catalytic residue at R490 (P = 0.0479);Loss of catalytic residue at R490 (P = 0.0479);
MVP		1.0
MPC		1.6
ClinPred		0.65	D
GERP RS		4.2
Varity_R		0.69
gMVP		0.82

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: rs145268073; hg19: chr1-247588214;