Genetic Variant NM_002510.3:c.64G>A (chr7-23246921-G-A) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_002510.3(GPNMB):c.64G>A(p.Ala22Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,457,352 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A22D) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

GPNMB
NM_002510.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.71

Publications

0 publications found

Variant links:

Genes affected

GPNMB (HGNC:4462): (glycoprotein nmb) The protein encoded by this gene is a type I transmembrane glycoprotein which shows homology to the pMEL17 precursor, a melanocyte-specific protein. GPNMB shows expression in the lowly metastatic human melanoma cell lines and xenografts but does not show expression in the highly metastatic cell lines. GPNMB may be involved in growth delay and reduction of metastatic potential. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

GPNMB Gene-Disease associations (from GenCC):

amyloidosis, primary localized cutaneous, 3
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P

GPNMB links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.19593054).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GPNMB	NM_002510.3 link	c.64G>A	p.Ala22Thr	missense_variant	Exon 1 of 11	ENST00000258733.9	NP_002501.1	Q14956-2Q96F58A0A024RA55

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GPNMB	ENST00000258733.9 link	c.64G>A	p.Ala22Thr	missense_variant	Exon 1 of 11	1	NM_002510.3	ENSP00000258733.5		Q14956-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1457352

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

725350

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33366

American (AMR)

AF:

0.00

AC:

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26096

East Asian (EAS)

AF:

0.00

AC:

AN:

39676

South Asian (SAS)

AF:

0.00

AC:

AN:

86180

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.00000181

AC:

AN:

1107864

Other (OTH)

AF:

0.00

AC:

AN:

60268

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.250

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.26

BayesDel_noAF

Benign

-0.60

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.097

.;T;.;.

Eigen

Benign

-0.14

Eigen_PC

Benign

-0.18

FATHMM_MKL

Uncertain

0.77

LIST_S2

Benign

0.68

T;T;T;T

M_CAP

Benign

0.011

MetaRNN

Benign

0.20

T;T;T;T

MetaSVM

Benign

-1.0

PhyloP100

1.7

PrimateAI

Benign

0.39

PROVEAN

Benign

-1.1

N;N;N;.

REVEL

Benign

0.074

Sift

Benign

0.10

T;T;T;.

Sift4G

Benign

0.11

T;T;T;.

Polyphen

0.85

P;P;P;.

Vest4

0.11

MutPred

0.26

Loss of stability (P = 0.0273);Loss of stability (P = 0.0273);Loss of stability (P = 0.0273);Loss of stability (P = 0.0273);

MVP

0.42

MPC

0.41

ClinPred

0.99

GERP RS

3.0

PromoterAI

-0.099

Neutral

(source)

Varity_R

0.063

gMVP

0.32

Mutation Taster

=81/19

polymorphism

(source)

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

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NM_002510.3:c.64G>A

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over