17-44070968-G-T

Position:

• chr17-44070968-G-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_138387.4(G6PC3):​c.3G>T​(p.Met1?) variant causes a start lost change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000715 in 1,399,452 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 Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: G6PC3 NM_138387.4 start_lost
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.87

Genes affected

G6PC3 (HGNC:24861): (glucose-6-phosphatase catalytic subunit 3) This gene encodes the catalytic subunit of glucose-6-phosphatase (G6Pase). G6Pase is located in the endoplasmic reticulum (ER) and catalyzes the hydrolysis of glucose-6-phosphate to glucose and phosphate in the last step of the gluconeogenic and glycogenolytic pathways. Mutations in this gene result in autosomal recessive severe congenital neutropenia. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2016]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-44070968-G-T is Pathogenic according to our data. Variant chr17-44070968-G-T is described in ClinVar as [Pathogenic]. Clinvar id is 2837752.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
G6PC3	NM_138387.4	c.3G>T	p.Met1?	start_lost	1/6	ENST00000269097.9	NP_612396.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
G6PC3	ENST00000269097.9	c.3G>T	p.Met1?	start_lost	1/6	1	NM_138387.4	ENSP00000269097	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.15e-7 AC: 1 AN: 1399452 Hom.: 0 Cov.: 31 AF XY: 0.00000145 AC XY: 1 AN XY: 690482

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000279

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.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Autosomal recessive severe congenital neutropenia due to G6PC3 deficiency Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 16, 2023

For these reasons, this variant has been classified as Pathogenic. This sequence change affects the initiator methionine of the G6PC3 mRNA. The next in-frame methionine is located at codon 116. This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with G6PC3-related conditions. This variant disrupts a region of the G6PC3 protein in which other variant(s) (p.Pro44Ser) have been determined to be pathogenic (PMID: 21385794, 22469094, 25492228, 27577878, 29163546). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.38
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.53	D;T
Eigen	Pathogenic	0.69
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D;D
M_CAP	Pathogenic	0.71	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Uncertain	0.36	D
MutationTaster	Benign	1.0	D
PROVEAN	Uncertain	-3.3	D;.
REVEL	Pathogenic	0.76
Sift	Pathogenic	0.0	D;.
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;.
Vest4		0.93
MutPred		0.95		Gain of catalytic residue at M1 (P = 0.0999);Gain of catalytic residue at M1 (P = 0.0999);
MVP		0.89
ClinPred		1.0	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.92
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

No publications associated with this variant yet.

Other links and lift over

hg19: chr17-42148336;