7-23254254-TAGATGCCAAAAGGA-T

Variant names:

• chr7-23254254-TAGATGCCAAAAGGA-T
• rs758729806
• NM_002510.3:c.319_332delAAGGAAGATGCCAA

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_002510.3(GPNMB):​c.319_332delAAGGAAGATGCCAA​(p.Lys107TrpfsTer6) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000725 in 1,613,644 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: 𝑓 0.00040 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00076 (0 hom.)
• Consequence: GPNMB NM_002510.3 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 8.61

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]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 7-23254254-TAGATGCCAAAAGGA-T is Pathogenic according to our data. Variant chr7-23254254-TAGATGCCAAAAGGA-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1324506.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GPNMB	NM_002510.3	c.319_332delAAGGAAGATGCCAA	p.Lys107TrpfsTer6	frameshift_variant	Exon 3 of 11	ENST00000258733.9	NP_002501.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GPNMB	ENST00000258733.9	c.319_332delAAGGAAGATGCCAA	p.Lys107TrpfsTer6	frameshift_variant	Exon 3 of 11	1	NM_002510.3	ENSP00000258733.5

Frequencies

GnomAD3 genomes AF: 0.000401 AC: 61 AN: 152194 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000121

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000779

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000589 AC: 148 AN: 251404 Hom.: 1 AF XY: 0.000581 AC XY: 79 AN XY: 135862

Gnomad AFR exome AF: 0.000185

Gnomad AMR exome AF: 0.00124

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000229

Gnomad FIN exome AF: 0.0000462

Gnomad NFE exome AF: 0.000809

Gnomad OTH exome AF: 0.000326

GnomAD4 exome AF: 0.000759 AC: 1109 AN: 1461332 Hom.: 0 AF XY: 0.000765 AC XY: 556 AN XY: 727028

Gnomad4 AFR exome AF: 0.000120

Gnomad4 AMR exome AF: 0.00101

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000244

Gnomad4 FIN exome AF: 0.0000749

Gnomad4 NFE exome AF: 0.000908

Gnomad4 OTH exome AF: 0.000431

GnomAD4 genome AF: 0.000400 AC: 61 AN: 152312 Hom.: 0 Cov.: 32 AF XY: 0.000269 AC XY: 20 AN XY: 74482

Gnomad4 AFR AF: 0.000120

Gnomad4 AMR AF: 0.0000654

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000779

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000651 Hom.: 0

Bravo AF: 0.000438

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Amyloidosis, primary localized cutaneous, 3 Pathogenic:1

Aug 23, 2019

Revvity Omics, Revvity

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Pathogenic:1

Dec 07, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Lys107Trpfs*6) in the GPNMB gene. It is expected to result in an absent or disrupted protein product. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the ExAC database. This variant has not been reported in the literature in individuals with GPNMB-related disease. Loss-of-function variants in GPNMB are known to be pathogenic (PMID: 29336782). For these reasons, this variant has been classified as Pathogenic. -

GPNMB-related disorder Pathogenic:1

May 06, 2024

PreventionGenetics, part of Exact Sciences

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The GPNMB c.319_332del14 variant is predicted to result in a frameshift and premature protein termination (p.Lys107Trpfs*6). To our knowledge, this variant has not been reported in the literature in association with GPNMB-related disease. This variant is reported in 0.12% of alleles in individuals of Latino descent in gnomAD. Frameshift variants in GPNMB are expected to be pathogenic. This variant is interpreted as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs758729806; hg19: chr7-23293873;