Genetic Variant GNPTG:p.Ala2Ala (chr16-1351971-G-A) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_ModerateBP6_ModerateBP7

The NM_032520.5(GNPTG):c.6G>A(p.Ala2Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000684 in 1,315,892 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. A2A) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000043 ( 0 hom. )

Consequence

GNPTG
NM_032520.5 synonymous

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: 0.429

Publications

0 publications found

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:

TSR3 (HGNC:14175): (TSR3 ribosome maturation factor) Enables transferase activity. Involved in enzyme-directed rRNA pseudouridine synthesis. Predicted to be located in cytosol. [provided by Alliance of Genome Resources, Apr 2022]

TSR3 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.28).

BP6

Variant 16-1351971-G-A is Benign according to our data. Variant chr16-1351971-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 1464335.Status of the report is criteria_provided_single_submitter, 1 stars.

BP7

Synonymous conserved (PhyloP=0.429 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_032520.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GNPTG	NM_032520.5	MANE Select	c.6G>A	p.Ala2Ala	synonymous	Exon 1 of 11	NP_115909.1	Q9UJJ9
	TSR3	NM_001001410.3	MANE Select	c.-167C>T		upstream_gene	N/A	NP_001001410.1	Q9UJK0

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
GNPTG	ENST00000204679.9	TSL:1 MANE Select	c.6G>A	p.Ala2Ala	synonymous	Exon 1 of 11	ENSP00000204679.4	Q9UJJ9
GNPTG	ENST00000891792.1		c.6G>A	p.Ala2Ala	synonymous	Exon 1 of 12	ENSP00000561851.1
GNPTG	ENST00000529110.2	TSL:2	c.6G>A	p.Ala2Ala	synonymous	Exon 1 of 10	ENSP00000435349.2	H0YEA7

Frequencies

GnomAD3 genomes

AF:

0.0000264

AC:

AN:

151648

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

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:

0.0000960

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000295

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000463

AC:

AN:

21590

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000541

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000429

AC:

AN:

1164244

Hom.:

Cov.:

AF XY:

0.00000355

AC XY:

AN XY:

563534

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

23472

American (AMR)

AF:

0.00

AC:

AN:

11430

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

16618

East Asian (EAS)

AF:

0.0000762

AC:

AN:

26260

South Asian (SAS)

AF:

0.00

AC:

AN:

40550

European-Finnish (FIN)

AF:

0.0000770

AC:

AN:

25964

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3242

European-Non Finnish (NFE)

AF:

0.00000103

AC:

AN:

969416

Other (OTH)

AF:

0.00

AC:

AN:

47292

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.605

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000264

AC:

AN:

151648

Hom.:

Cov.:

AF XY:

0.0000270

AC XY:

AN XY:

74068

show subpopulations

African (AFR)

AF:

0.0000242

AC:

AN:

41386

American (AMR)

AF:

0.00

AC:

AN:

15210

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00

AC:

AN:

4836

European-Finnish (FIN)

AF:

0.0000960

AC:

AN:

10420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

314

European-Non Finnish (NFE)

AF:

0.0000295

AC:

AN:

67840

Other (OTH)

AF:

0.00

AC:

AN:

2082

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.413

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000108

Hom.:

ClinVar

ClinVar submissions as Germline

Significance:Likely benign

Revision:criteria provided, single submitter

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.28

CADD

Benign

(source)

DANN

Benign

0.91

PhyloP100

0.43

PromoterAI

-0.30

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

2.6

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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over