1-247418307-CTTT-CTT

Variant names:

• chr1-247418307-CT-C
• rs144128307
• NM_001243133.2:c.-482delT

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BS1 BS2

The NM_001243133.2(NLRP3):​c.-482delT variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0236 in 186,730 control chromosomes in the GnomAD database, including 11 homozygotes. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0078 (11 hom., cov: 32)
  • Exomes 𝑓: 0.083 (0 hom.)
• Consequence: NLRP3 NM_001243133.2 5_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.165
• Publications: 1 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: Benign. The variant received -8 ACMG points.

• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00777 (1146/147578) while in subpopulation AFR AF = 0.0257 (1043/40636). AF 95% confidence interval is 0.0244. There are 11 homozygotes in GnomAd4. There are 543 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High AC in GnomAd4 at 1146 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NLRP3	NM_001243133.2	c.-482delT		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.-482delT		5_prime_UTR_variant	Exon 2 of 10	1	NM_001243133.2	ENSP00000337383.4

Frequencies

GnomAD3 genomes AF: 0.00774 AC: 1142 AN: 147522 Hom.: 10 Cov.: 32

Gnomad AFR AF: 0.0256

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00217

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000392

Gnomad SAS AF: 0.00171

Gnomad FIN AF: 0.00180

Gnomad MID AF: 0.00325

Gnomad NFE AF: 0.000557

Gnomad OTH AF: 0.00299

GnomAD4 exome AF: 0.0832 AC: 3259 AN: 39152 Hom.: 0 Cov.: 0 AF XY: 0.0837 AC XY: 1728 AN XY: 20644

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0674 AC: 43 AN: 638

American (AMR) AF: 0.121 AC: 308 AN: 2548

Ashkenazi Jewish (ASJ) AF: 0.0568 AC: 42 AN: 740

East Asian (EAS) AF: 0.0893 AC: 178 AN: 1994

South Asian (SAS) AF: 0.0806 AC: 535 AN: 6636

European-Finnish (FIN) AF: 0.0687 AC: 114 AN: 1660

Middle Eastern (MID) AF: 0.0403 AC: 5 AN: 124

European-Non Finnish (NFE) AF: 0.0819 AC: 1870 AN: 22836

Other (OTH) AF: 0.0830 AC: 164 AN: 1976

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome AF: 0.00777 AC: 1146 AN: 147578 Hom.: 11 Cov.: 32 AF XY: 0.00756 AC XY: 543 AN XY: 71834

African (AFR) AF: 0.0257 AC: 1043 AN: 40636

American (AMR) AF: 0.00217 AC: 32 AN: 14752

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3398

East Asian (EAS) AF: 0.000393 AC: 2 AN: 5094

South Asian (SAS) AF: 0.00172 AC: 8 AN: 4660

European-Finnish (FIN) AF: 0.00180 AC: 17 AN: 9440

Middle Eastern (MID) AF: 0.00355 AC: 1 AN: 282

European-Non Finnish (NFE) AF: 0.000557 AC: 37 AN: 66388

Other (OTH) AF: 0.00297 AC: 6 AN: 2022

Alfa AF: 0.000144 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.17
Mutation Taster		=100/0	polymorphism

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: rs144128307; hg19: chr1-247581609;