4-184117023-G-T

Position:

• chr4-184117023-G-T

Variant summary

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

The NM_153343.4(ENPP6):​c.688C>A​(p.Gln230Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,882 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: ENPP6 NM_153343.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.00

Genes affected

ENPP6 (HGNC:23409): (ectonucleotide pyrophosphatase/phosphodiesterase 6) Enables glycerophosphocholine cholinephosphodiesterase activity. Involved in choline metabolic process and lipid metabolic process. Located in extracellular region and plasma membrane. [provided by Alliance of Genome Resources, Apr 2022]

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=0.25256097).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ENPP6	NM_153343.4	c.688C>A	p.Gln230Lys	missense_variant	5/8	ENST00000296741.7	NP_699174.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ENPP6	ENST00000296741.7	c.688C>A	p.Gln230Lys	missense_variant	5/8	1	NM_153343.4	ENSP00000296741	P1
ENPP6	ENST00000512353.1	c.424C>A	p.Gln142Lys	missense_variant	6/6	3		ENSP00000423497
ENPP6	ENST00000510054.1	n.76C>A		non_coding_transcript_exon_variant	2/3	3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461882 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 727246

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 06, 2021

The c.688C>A (p.Q230K) alteration is located in exon 5 (coding exon 5) of the ENPP6 gene. This alteration results from a C to A substitution at nucleotide position 688, causing the glutamine (Q) at amino acid position 230 to be replaced by a lysine (K). 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	Benign	0.085
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	18
DANN	Benign	0.70
DEOGEN2	Benign	0.028	T;T
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.16
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Benign	0.63	T;T
M_CAP	Benign	0.022	T
MetaRNN	Benign	0.25	T;T
MetaSVM	Benign	-0.71	T
MutationAssessor	Benign	0.68	N;.
MutationTaster	Benign	0.86	D
PrimateAI	Benign	0.39	T
PROVEAN	Benign	-1.3	N;N
REVEL	Benign	0.13
Sift	Benign	0.27	T;T
Sift4G	Benign	0.66	T;.
Polyphen		0.036	B;.
Vest4		0.44
MutPred		0.53		Gain of ubiquitination at Q230 (P = 0.0219);.;
MVP		0.79
MPC		0.15
ClinPred		0.33	T
GERP RS		4.1
Varity_R		0.22
gMVP		0.79

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: rs778484221; hg19: chr4-185038176;