6-131846837-C-T

Variant names:

• chr6-131846837-C-T
• rs997509
• NM_006208.3:c.241-939C>T

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_006208.3(ENPP1):​c.241-939C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0515 in 152,200 control chromosomes in the GnomAD database, including 249 homozygotes. 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: 𝑓 0.051 (249 hom., cov: 32)
• Consequence: ENPP1 NM_006208.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.982
• Publications: 17 publications found

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]

ENPP1 Gene-Disease associations (from GenCC):

• arterial calcification, generalized, of infancy, 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• hypopigmentation-punctate palmoplantar keratoderma syndrome

  Inheritance: AD Classification: STRONG, SUPPORTIVE, LIMITED Submitted by: Ambry Genetics, Genomics England PanelApp, Orphanet, G2P, Labcorp Genetics (formerly Invitae)
• hypophosphatemic rickets, autosomal recessive, 2

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• arterial calcification of infancy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autosomal recessive hypophosphatemic rickets

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• autosomal recessive inherited pseudoxanthoma elasticum

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.99).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0877 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ENPP1	NM_006208.3	c.241-939C>T		intron_variant	Intron 1 of 24	ENST00000647893.1	NP_006199.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ENPP1	ENST00000647893.1	c.241-939C>T		intron_variant	Intron 1 of 24		NM_006208.3	ENSP00000498074.1

Frequencies

GnomAD3 genomes AF: 0.0514 AC: 7810 AN: 152080 Hom.: 241 Cov.: 32

Gnomad AFR AF: 0.0896

Gnomad AMI AF: 0.0164

Gnomad AMR AF: 0.0365

Gnomad ASJ AF: 0.0637

Gnomad EAS AF: 0.00174

Gnomad SAS AF: 0.0348

Gnomad FIN AF: 0.0524

Gnomad MID AF: 0.0949

Gnomad NFE AF: 0.0357

Gnomad OTH AF: 0.0536

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.0515 AC: 7836 AN: 152200 Hom.: 249 Cov.: 32 AF XY: 0.0505 AC XY: 3755 AN XY: 74396

African (AFR) AF: 0.0901 AC: 3741 AN: 41518

American (AMR) AF: 0.0365 AC: 558 AN: 15300

Ashkenazi Jewish (ASJ) AF: 0.0637 AC: 221 AN: 3472

East Asian (EAS) AF: 0.00174 AC: 9 AN: 5172

South Asian (SAS) AF: 0.0346 AC: 167 AN: 4824

European-Finnish (FIN) AF: 0.0524 AC: 555 AN: 10588

Middle Eastern (MID) AF: 0.0952 AC: 28 AN: 294

European-Non Finnish (NFE) AF: 0.0357 AC: 2430 AN: 68010

Other (OTH) AF: 0.0531 AC: 112 AN: 2110

Alfa AF: 0.0413 Hom.: 190

Bravo AF: 0.0503

Asia WGS AF: 0.0270 AC: 98 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.99
CADD	Benign	0.12
DANN	Benign	0.53
PhyloP100		-0.98
Mutation Taster		=100/0	polymorphism (auto)

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: rs997509; hg19: chr6-132167977;