17-79735220-C-T

Variant names:

• chr17-79735220-C-T
• rs80066859
• NM_178543.5:c.577C>T

Variant summary

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

The NM_178543.5(ENPP7):​c.577C>T​(p.Leu193Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ENPP7 NM_178543.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.12

Genes affected

ENPP7 (HGNC:23764): (ectonucleotide pyrophosphatase/phosphodiesterase 7) The protein encoded by this gene is an intestinal alkaline sphingomyelin phosphodiesterase that converts sphingomyelin to ceramide and phosphocholine. The encoded protein is anchored in the cell membrane, and it may function to protect the intestinal mucosa from inflammation and tumorigenesis. This protein is glycosylated and also exhibits lysophosphatidylcholine hydrolase activity. [provided by RefSeq, Oct 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ENPP7	NM_178543.5	c.577C>T	p.Leu193Phe	missense_variant	Exon 3 of 6	ENST00000328313.10	NP_848638.3
ENPP7	XM_011524737.2	c.670C>T	p.Leu224Phe	missense_variant	Exon 3 of 5		XP_011523039.2
ENPP7	XR_001752505.2	n.774C>T		non_coding_transcript_exon_variant	Exon 3 of 5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ENPP7	ENST00000328313.10	c.577C>T	p.Leu193Phe	missense_variant	Exon 3 of 6	1	NM_178543.5	ENSP00000332656.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Feb 07, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.577C>T (p.L193F) alteration is located in exon 3 (coding exon 3) of the ENPP7 gene. This alteration results from a C to T substitution at nucleotide position 577, causing the leucine (L) at amino acid position 193 to be replaced by a phenylalanine (F). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.58
BayesDel_addAF	Uncertain	0.098	D
BayesDel_noAF	Benign	-0.10
CADD	Uncertain	24
DANN	Uncertain	1.0
Eigen	Uncertain	0.50
Eigen_PC	Uncertain	0.40
FATHMM_MKL	Uncertain	0.84	D
M_CAP	Benign	0.073	D
MetaRNN	Uncertain	0.56	D
MetaSVM	Uncertain	0.38	D
PrimateAI	Benign	0.46	T
PROVEAN	Uncertain	-3.5	D
REVEL	Uncertain	0.64
Sift	Benign	0.067	T
Sift4G	Pathogenic	0.0	D
Vest4		0.31
MutPred		0.64		Loss of stability (P = 0.0879);
MVP		0.85
MPC		0.52
ClinPred		0.95	D
GERP RS		4.8
gMVP		0.80

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: rs80066859; hg19: chr17-77709019;