Genetic Variant NPL:p.Val43Ala (chr1-182803757-T-C) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_030769.3(NPL):c.128T>C(p.Val43Ala) variant causes a missense change. The variant allele was found at a frequency of 0.00000617 in 1,459,702 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

NPL
NM_030769.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.60

Variant links:

Genes affected

NPL (HGNC:16781): (N-acetylneuraminate pyruvate lyase) This gene encodes a member of the N-acetylneuraminate lyase sub-family of (beta/alpha)(8)-barrel enzymes. N-acetylneuraminate lyases regulate cellular concentrations of N-acetyl-neuraminic acid (sialic acid) by mediating the reversible conversion of sialic acid into N-acetylmannosamine and pyruvate. A pseudogene of this gene is located on the short arm of chromosome 2. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Jan 2011]

NPL links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.896

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NPL	NM_030769.3 link	c.128T>C	p.Val43Ala	missense_variant	Exon 4 of 13	ENST00000367553.6	NP_110396.1	Q9BXD5-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NPL	ENST00000367553.6 link	c.128T>C	p.Val43Ala	missense_variant	Exon 4 of 13	1	NM_030769.3	ENSP00000356524.1		Q9BXD5-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000358

AC:

AN:

251410

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135874

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000260

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000617

AC:

AN:

1459702

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726434

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000201

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.0000302

ExAC

AF:

0.0000412

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Nov 21, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.128T>C (p.V43A) alteration is located in exon 4 (coding exon 2) of the NPL gene. This alteration results from a T to C substitution at nucleotide position 128, causing the valine (V) at amino acid position 43 to be replaced by an alanine (A). 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

0.85

BayesDel_addAF

Uncertain

0.11

BayesDel_noAF

Pathogenic

0.22

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.91

.;D;.;D;T

Eigen

Uncertain

0.60

Eigen_PC

Uncertain

0.58

FATHMM_MKL

Uncertain

0.88

LIST_S2

Uncertain

0.90

.;.;D;D;D

M_CAP

Pathogenic

0.55

MetaRNN

Pathogenic

0.90

D;D;D;D;D

MetaSVM

Pathogenic

0.92

MutationAssessor

Uncertain

2.1

M;M;M;M;.

PrimateAI

Uncertain

0.54

PROVEAN

Uncertain

-3.4

D;D;D;D;.

REVEL

Pathogenic

0.85

Sift

Uncertain

0.0010

D;D;D;D;.

Sift4G

Benign

0.062

T;D;T;D;T

Polyphen

1.0

D;D;D;D;.

Vest4

0.73

MutPred

0.75

Loss of methylation at K44 (P = 0.0467);Loss of methylation at K44 (P = 0.0467);Loss of methylation at K44 (P = 0.0467);Loss of methylation at K44 (P = 0.0467);Loss of methylation at K44 (P = 0.0467);

MVP

0.96

MPC

0.64

ClinPred

0.79

GERP RS

5.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.78

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over