6-131808123-G-T

Position:

• chr6-131808123-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_006208.3(ENPP1):​c.88G>T​(p.Asp30Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 8.7e-7 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: ENPP1 NM_006208.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 0.907

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2099537).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ENPP1	NM_006208.3	c.88G>T	p.Asp30Tyr	missense_variant	1/25	ENST00000647893.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ENPP1	ENST00000647893.1	c.88G>T	p.Asp30Tyr	missense_variant	1/25		NM_006208.3	P1
ENPP1	ENST00000486853.1	n.108G>T		non_coding_transcript_exon_variant	1/4	2
ENPP1	ENST00000513998.5	c.88G>T	p.Asp30Tyr	missense_variant, NMD_transcript_variant	1/25	5
ENPP1	ENST00000650507.1	c.1G>T	p.Asp1Tyr	missense_variant, NMD_transcript_variant	1/4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 8.74e-7 AC: 1 AN: 1144168 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 550464

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000264

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 17, 2023

This sequence change replaces aspartic acid, which is acidic and polar, with tyrosine, which is neutral and polar, at codon 30 of the ENPP1 protein (p.Asp30Tyr). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with ENPP1-related conditions. ClinVar contains an entry for this variant (Variation ID: 2635743). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

ENPP1-related disorder Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Nov 22, 2022

The ENPP1 c.88G>T variant is predicted to result in the amino acid substitution p.Asp30Tyr. To our knowledge, this variant has not been reported in the literature or in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.40
CADD	Benign	22
DANN	Benign	0.97
DEOGEN2	Benign	0.27	T;T
Eigen	Benign	-0.62
Eigen_PC	Benign	-0.66
FATHMM_MKL	Benign	0.14	N
LIST_S2	Benign	0.53	.;T
M_CAP	Pathogenic	0.70	D
MetaRNN	Benign	0.21	T;T
MetaSVM	Benign	-0.87	T
MutationAssessor	Benign	0.34	N;N
MutationTaster	Benign	1.0	N
PrimateAI	Pathogenic	0.85	D
PROVEAN	Benign	-0.49	N;.
REVEL	Benign	0.13
Sift	Uncertain	0.0040	D;.
Sift4G	Uncertain	0.0070	D;.
Polyphen		0.45	B;B
Vest4		0.11
MutPred		0.19		Loss of solvent accessibility (P = 0.0509);Loss of solvent accessibility (P = 0.0509);
MVP		0.76
MPC		0.86
ClinPred		0.53	D
GERP RS		3.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.5
Varity_R		0.12
gMVP		0.24

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-132129263;