chr1-247418570-G-A

Variant names:

• chr1-247418570-G-A
• rs138900557
• NM_001243133.2:c.-231G>A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_001243133.2(NLRP3):​c.-231G>A variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0383 in 534,594 control chromosomes in the GnomAD database, including 569 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.035 (139 hom., cov: 32)
  • Exomes 𝑓: 0.040 (430 hom.)
• Consequence: NLRP3 NM_001243133.2 5_prime_UTR
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:4
• Conservation: PhyloP100: 0.399

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 Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.93).
• BP6: Variant 1-247418570-G-A is Benign according to our data. Variant chr1-247418570-G-A is described in ClinVar as [Benign]. Clinvar id is 296932.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.0346 (5275/152284) while in subpopulation NFE AF= 0.0513 (3493/68030). AF 95% confidence interval is 0.0499. There are 139 homozygotes in gnomad4. There are 2640 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 5275 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NLRP3	NM_001243133.2	c.-231G>A		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	c.-231G>A		5_prime_UTR_variant	Exon 2 of 10	1	NM_001243133.2	ENSP00000337383.4

Frequencies

GnomAD3 genomes AF: 0.0347 AC: 5280 AN: 152168 Hom.: 139 Cov.: 32

Gnomad AFR AF: 0.00714

Gnomad AMI AF: 0.00439

Gnomad AMR AF: 0.0173

Gnomad ASJ AF: 0.0173

Gnomad EAS AF: 0.00135

Gnomad SAS AF: 0.0217

Gnomad FIN AF: 0.0941

Gnomad MID AF: 0.0127

Gnomad NFE AF: 0.0514

Gnomad OTH AF: 0.0224

GnomAD4 exome AF: 0.0398 AC: 15216 AN: 382310 Hom.: 430 Cov.: 4 AF XY: 0.0398 AC XY: 8129 AN XY: 204230

Gnomad4 AFR exome AF: 0.00755

Gnomad4 AMR exome AF: 0.0128

Gnomad4 ASJ exome AF: 0.0181

Gnomad4 EAS exome AF: 0.000126

Gnomad4 SAS exome AF: 0.0230

Gnomad4 FIN exome AF: 0.0794

Gnomad4 NFE exome AF: 0.0491

Gnomad4 OTH exome AF: 0.0351

GnomAD4 genome AF: 0.0346 AC: 5275 AN: 152284 Hom.: 139 Cov.: 32 AF XY: 0.0355 AC XY: 2640 AN XY: 74448

Gnomad4 AFR AF: 0.00712

Gnomad4 AMR AF: 0.0173

Gnomad4 ASJ AF: 0.0173

Gnomad4 EAS AF: 0.00135

Gnomad4 SAS AF: 0.0217

Gnomad4 FIN AF: 0.0941

Gnomad4 NFE AF: 0.0513

Gnomad4 OTH AF: 0.0213

Alfa AF: 0.0521 Hom.: 39

Bravo AF: 0.0252

Asia WGS AF: 0.00520 AC: 18 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Familial cold autoinflammatory syndrome 1 Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided Benign:1

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Familial amyloid nephropathy with urticaria AND deafness Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Chronic infantile neurological, cutaneous and articular syndrome Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.93
CADD	Benign	3.7
DANN	Benign	0.49

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: rs138900557; hg19: chr1-247581872;