1-247418727-G-C

Variant names:

• chr1-247418727-G-C
• rs202076321
• NM_001243133.2:c.-74G>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001243133.2(NLRP3):​c.-74G>C variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000709 in 1,410,352 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: NLRP3 NM_001243133.2 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.02
• Publications: 0 publications found

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]

NLRP3 Gene-Disease associations (from GenCC):

• CINCA syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• cryopyrin-associated periodic syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: Illumina
• familial cold autoinflammatory syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
• familial cold autoinflammatory syndrome 1

  Inheritance: AD Classification: STRONG Submitted by: G2P
• Muckle-Wells syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• keratitis fugax hereditaria

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NLRP3	NM_001243133.2	c.-74G>C		5_prime_UTR_premature_start_codon_gain_variant	Exon 2 of 10	ENST00000336119.8	NP_001230062.1
NLRP3	NM_001243133.2	c.-74G>C		5_prime_UTR_variant	Exon 2 of 10	ENST00000336119.8	NP_001230062.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NLRP3	ENST00000336119.8	c.-74G>C		5_prime_UTR_premature_start_codon_gain_variant	Exon 2 of 10	1	NM_001243133.2	ENSP00000337383.4
NLRP3	ENST00000336119.8	c.-74G>C		5_prime_UTR_variant	Exon 2 of 10	1	NM_001243133.2	ENSP00000337383.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.09e-7 AC: 1 AN: 1410352 Hom.: 0 Cov.: 24 AF XY: 0.00000142 AC XY: 1 AN XY: 704654

African (AFR) AF: 0.00 AC: 0 AN: 32502

American (AMR) AF: 0.00 AC: 0 AN: 44514

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25802

East Asian (EAS) AF: 0.00 AC: 0 AN: 39428

South Asian (SAS) AF: 0.0000118 AC: 1 AN: 84784

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53108

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4122

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1067534

Other (OTH) AF: 0.00 AC: 0 AN: 58558

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	0.12
DANN	Benign	0.33
PhyloP100		-2.0
PromoterAI		0.0076	Neutral

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

Other links and lift over

dbSNP: rs202076321; hg19: chr1-247582029;