chr17-44070996-A-G

Position:

• chr17-44070996-A-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_138387.4(G6PC3):​c.31A>G​(p.Ile11Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000711 in 1,407,234 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: G6PC3 NM_138387.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.00600

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 Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.02412057).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
G6PC3	NM_138387.4	c.31A>G	p.Ile11Val	missense_variant	1/6	ENST00000269097.9	NP_612396.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
G6PC3	ENST00000269097.9	c.31A>G	p.Ile11Val	missense_variant	1/6	1	NM_138387.4	ENSP00000269097	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.11e-7 AC: 1 AN: 1407234 Hom.: 0 Cov.: 31 AF XY: 0.00000144 AC XY: 1 AN XY: 695310

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.23e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

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

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 30, 2018

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The valine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with G6PC3-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces isoleucine with valine at codon 11 of the G6PC3 protein (p.Ile11Val). The isoleucine residue is weakly conserved and there is a small physicochemical difference between isoleucine and valine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.060
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.51
CADD	Benign	12
DANN	Benign	0.77
DEOGEN2	Benign	0.19	T;T
Eigen	Benign	-1.1
Eigen_PC	Benign	-0.95
FATHMM_MKL	Benign	0.18	N
LIST_S2	Benign	0.55	T;T
M_CAP	Benign	0.023	T
MetaRNN	Benign	0.024	T;T
MetaSVM	Benign	-0.98	T
MutationAssessor	Benign	-1.6	N;.
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-0.17	N;.
REVEL	Benign	0.054
Sift	Benign	1.0	T;.
Sift4G	Benign	1.0	T;T
Polyphen		0.0	B;.
Vest4		0.026
MutPred		0.30		Loss of helix (P = 0.1299);Loss of helix (P = 0.1299);
MVP		0.36
MPC		0.25
ClinPred		0.061	T
GERP RS		2.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.031
gMVP		0.29

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

LitVar

Other links and lift over

dbSNP: rs1597905158; hg19: chr17-42148364;