6-131891668-C-T

Position:

• chr6-131891668-C-T

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_006208.3(ENPP1):​c.*1157C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.441 in 151,746 control chromosomes in the GnomAD database, including 19,182 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.44 (19182 hom., cov: 31)
  • Failed GnomAD Quality Control
• Consequence: ENPP1 NM_006208.3 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:2
• Conservation: PhyloP100: -2.17

Genes affected

ENPP1 (HGNC:3356): (ectonucleotide pyrophosphatase/phosphodiesterase 1) This gene is a member of the ecto-nucleotide pyrophosphatase/phosphodiesterase (ENPP) family. The encoded protein is a type II transmembrane glycoprotein comprising two identical disulfide-bonded subunits. This protein has broad specificity and cleaves a variety of substrates, including phosphodiester bonds of nucleotides and nucleotide sugars and pyrophosphate bonds of nucleotides and nucleotide sugars. This protein may function to hydrolyze nucleoside 5' triphosphates to their corresponding monophosphates and may also hydrolyze diadenosine polyphosphates. Mutations in this gene have been associated with 'idiopathic' infantile arterial calcification, ossification of the posterior longitudinal ligament of the spine (OPLL), and insulin resistance. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.91).
• BP6: Variant 6-131891668-C-T is Benign according to our data. Variant chr6-131891668-C-T is described in ClinVar as [Benign]. Clinvar id is 355381.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.783 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ENPP1	NM_006208.3	c.*1157C>T		3_prime_UTR_variant	25/25	ENST00000647893.1	NP_006199.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ENPP1	ENST00000647893.1	c.*1157C>T		3_prime_UTR_variant	25/25		NM_006208.3	ENSP00000498074	P1

Frequencies

GnomAD3 genomes AF: 0.440 AC: 66772 AN: 151638 Hom.: 19130 Cov.: 31

Gnomad AFR AF: 0.789

Gnomad AMI AF: 0.360

Gnomad AMR AF: 0.494

Gnomad ASJ AF: 0.431

Gnomad EAS AF: 0.580

Gnomad SAS AF: 0.454

Gnomad FIN AF: 0.169

Gnomad MID AF: 0.554

Gnomad NFE AF: 0.248

Gnomad OTH AF: 0.448

GnomAD4 exome Data not reliable, filtered out with message: AC0 AC: 0 AN: 0 Hom.: 0 Cov.: 0 AC XY: 0 AN XY: 0

GnomAD4 genome AF: 0.441 AC: 66888 AN: 151746 Hom.: 19182 Cov.: 31 AF XY: 0.441 AC XY: 32694 AN XY: 74132

Gnomad4 AFR AF: 0.790

Gnomad4 AMR AF: 0.494

Gnomad4 ASJ AF: 0.431

Gnomad4 EAS AF: 0.580

Gnomad4 SAS AF: 0.455

Gnomad4 FIN AF: 0.169

Gnomad4 NFE AF: 0.248

Gnomad4 OTH AF: 0.449

Alfa AF: 0.235 Hom.: 939

Bravo AF: 0.481

Asia WGS AF: 0.555 AC: 1928 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, single submitter

Submissions by phenotype

Hypophosphatemic rickets, autosomal recessive, 2 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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. -

Arterial calcification, generalized, of infancy, 1 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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	-0.91
CADD	Benign	0.37
DANN	Benign	0.51
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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: rs7754859; hg19: chr6-132212808;