chr16-1361875-CAAGTAT-C

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1PM2PM4PP3PP5

The NM_032520.5(GNPTG):c.238_243delAAGTAT(p.Lys80_Tyr81del) variant causes a conservative inframe deletion change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000663 in 1,613,808 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000079 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000065 ( 0 hom. )

Consequence

GNPTG
NM_032520.5 conservative_inframe_deletion

Scores

Not classified

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3U:1

Conservation

PhyloP100: 8.76

Variant links:

Genes affected

GNPTG (HGNC:23026): (N-acetylglucosamine-1-phosphate transferase subunit gamma) This gene encodes the gamma sunbunit of the N-acetylglucosamine-1-phosphotransferase complex. This hexameric complex, composed of alpha, beta and gamma subunits, catalyzes the first step in synthesis of a mannose 6-phosphate lysosomal recognition marker. This enzyme complex is necessary for targeting of lysosomal hydrolases to the lysosome. Mutations in the gene encoding the gamma subunit have been associated with mucolipidosis IIIC, also known as mucolipidosis III gamma.[provided by RefSeq, Feb 2010]

GNPTG links:

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

PM1

In a domain MRH (size 102) in uniprot entity GNPTG_HUMAN there are 14 pathogenic changes around while only 1 benign (93%) in NM_032520.5

PM2

Very rare variant in population databases, with high coverage;

PM4

Nonframeshift variant in NON repetitive region in NM_032520.5.

PP3

No computational evidence supports a deleterious effect, but strongly conserved according to phyloP

PP5

Variant 16-1361875-CAAGTAT-C is Pathogenic according to our data. Variant chr16-1361875-CAAGTAT-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 550212.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=2, Uncertain_significance=1, Pathogenic=1}. Variant chr16-1361875-CAAGTAT-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GNPTG	NM_032520.5 link	c.238_243delAAGTAT	p.Lys80_Tyr81del	conservative_inframe_deletion	Exon 5 of 11	ENST00000204679.9	NP_115909.1	Q9UJJ9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GNPTG	ENST00000204679.9 link	c.238_243delAAGTAT	p.Lys80_Tyr81del	conservative_inframe_deletion	Exon 5 of 11	1	NM_032520.5	ENSP00000204679.4		Q9UJJ9

Frequencies

GnomAD3 genomes

AF:

0.0000788

AC:

AN:

152206

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000162

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000239

AC:

AN:

251194

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135830

show subpopulations

Gnomad AFR exome

AF:

0.0000616

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000650

AC:

AN:

1461602

Hom.:

AF XY:

0.0000591

AC XY:

AN XY:

727122

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000827

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000788

AC:

AN:

152206

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74354

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000162

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000567

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

GNPTG-mucolipidosis

Pathogenic:2Uncertain:1

Nov 07, 2021

Genome-Nilou Lab

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 15, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 10, 2021

Myriad Genetics, Inc.

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

NM_032520.4(GNPTG):c.238_243del6(K80_Y81del) is an in-frame deletion classified as a variant of uncertain significance in the context of mucolipidosis III gamma. K80_Y81del has been observed in cases with relevant disease (PMID: 21792934). Functional assessments of this variant are not available in the literature. K80_Y81del has been observed in population frequency databases (gnomAD: EAS 0.01%). In summary, there is insufficient evidence to classify NM_032520.4(GNPTG):c.238_243del6(K80_Y81del) as pathogenic or benign. Please note: this variant was assessed in the context of healthy population screening. -

not provided

Pathogenic:1

Feb 02, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant, c.238_243del, results in the deletion of 2 amino acid(s) of the GNPTG protein (p.Lys80_Tyr81del), but otherwise preserves the integrity of the reading frame. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has been observed in individual(s) with mucolipidosis III gamma (PMID: 21792934). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 550212). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

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