2-168902525-A-C

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_021176.3(G6PC2):c.299A>C(p.Gln100Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000286 in 1,397,468 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 Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000029 ( 0 hom. )

Consequence

G6PC2
NM_021176.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 8.99

Publications

0 publications found

Variant links:

Genes affected

G6PC2 (HGNC:28906): (glucose-6-phosphatase catalytic subunit 2) This gene encodes an enzyme belonging to the glucose-6-phosphatase catalytic subunit family. These enzymes are part of a multicomponent integral membrane system that catalyzes the hydrolysis of glucose-6-phosphate, the terminal step in gluconeogenic and glycogenolytic pathways, allowing the release of glucose into the bloodstream. The family member encoded by this gene is found in pancreatic islets and does not exhibit phosphohydrolase activity, but it is a major target of cell-mediated autoimmunity in diabetes. Several alternatively spliced transcript variants of this gene have been described, but their biological validity has not been determined. [provided by RefSeq, Jul 2008]

G6PC2 links:

SPC25 (HGNC:24031): (SPC25 component of NDC80 kinetochore complex) This gene encodes a protein that may be involved in kinetochore-microtubule interaction and spindle checkpoint activity. [provided by RefSeq, Jul 2008]

SPC25 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.888

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
G6PC2	NM_021176.3 link	c.299A>C	p.Gln100Pro	missense_variant	Exon 2 of 5	ENST00000375363.8	NP_066999.1	Q9NQR9-1
G6PC2	NM_001081686.2 link	c.299A>C	p.Gln100Pro	missense_variant	Exon 2 of 4		NP_001075155.1	Q9NQR9-3
G6PC2	XM_011511564.4 link	c.299A>C	p.Gln100Pro	missense_variant	Exon 2 of 3		XP_011509866.1
G6PC2	XM_011511565.4 link	c.-21+976A>C		intron_variant	Intron 1 of 3		XP_011509867.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
G6PC2	ENST00000375363.8 link	c.299A>C	p.Gln100Pro	missense_variant	Exon 2 of 5	1	NM_021176.3	ENSP00000364512.3		Q9NQR9-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000286

AC:

AN:

1397468

Hom.:

Cov.:

AF XY:

0.00000429

AC XY:

AN XY:

698982

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32212

American (AMR)

AF:

0.00

AC:

AN:

44654

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25726

East Asian (EAS)

AF:

0.00

AC:

AN:

39368

South Asian (SAS)

AF:

0.00

AC:

AN:

84974

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53362

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5640

European-Non Finnish (NFE)

AF:

0.00000380

AC:

AN:

1053440

Other (OTH)

AF:

0.00

AC:

AN:

58092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.463

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 03, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.299A>C (p.Q100P) alteration is located in exon 2 (coding exon 2) of the G6PC2 gene. This alteration results from a A to C substitution at nucleotide position 299, causing the glutamine (Q) at amino acid position 100 to be replaced by a proline (P). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.52

BayesDel_addAF

Pathogenic

0.39

BayesDel_noAF

Pathogenic

0.32

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.73

D;.

Eigen

Pathogenic

0.92

Eigen_PC

Pathogenic

0.87

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Uncertain

0.87

D;D

M_CAP

Uncertain

0.11

MetaRNN

Pathogenic

0.89

D;D

MetaSVM

Uncertain

0.45

MutationAssessor

Uncertain

2.9

M;M

PhyloP100

9.0

PrimateAI

Uncertain

0.60

PROVEAN

Pathogenic

-5.8

D;D

REVEL

Pathogenic

0.91

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;.

Vest4

0.95

MutPred

0.64

Gain of glycosylation at T103 (P = 0.0471);Gain of glycosylation at T103 (P = 0.0471);

MVP

0.90

MPC

0.26

ClinPred

1.0

GERP RS

5.6

Varity_R

0.93

gMVP

0.95

Mutation Taster

=32/68

disease causing

(source)

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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2-168902525-A-C

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over