Genetic Variant IMPDH2:p.Gly502Ser (chr3-49024514-C-T) – ACMG Classification: Uncertain_significance (5 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1PM2PP3

The NM_000884.3(IMPDH2):c.1504G>A(p.Gly502Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,892 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: 6.8e-7 ( 0 hom. )

Consequence

IMPDH2
NM_000884.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.48

Variant links:

Genes affected

IMPDH2 (HGNC:6053): (inosine monophosphate dehydrogenase 2) This gene encodes the rate-limiting enzyme in the de novo guanine nucleotide biosynthesis. It is thus involved in maintaining cellular guanine deoxy- and ribonucleotide pools needed for DNA and RNA synthesis. The encoded protein catalyzes the NAD-dependent oxidation of inosine-5'-monophosphate into xanthine-5'-monophosphate, which is then converted into guanosine-5'-monophosphate. This gene is up-regulated in some neoplasms, suggesting it may play a role in malignant transformation. [provided by RefSeq, Jul 2008]

IMPDH2 links:

ENSG00000290315 (HGNC:):

ENSG00000290315 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 5 ACMG points.

PM1

In a binding_site (size 0) in uniprot entity IMDH2_HUMAN

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.82

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IMPDH2	NM_000884.3 link	c.1504G>A	p.Gly502Ser	missense_variant	Exon 13 of 14	ENST00000326739.9	NP_000875.2	P12268A0A384N6C2
IMPDH2	NM_001410759.1 link	c.1576G>A	p.Gly526Ser	missense_variant	Exon 14 of 15		NP_001397688.1
IMPDH2	NM_001410760.1 link	c.1501G>A	p.Gly501Ser	missense_variant	Exon 13 of 14		NP_001397689.1
IMPDH2	NM_001410761.1 link	c.1429G>A	p.Gly477Ser	missense_variant	Exon 12 of 13		NP_001397690.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IMPDH2	ENST00000326739.9 link	c.1504G>A	p.Gly502Ser	missense_variant	Exon 13 of 14	1	NM_000884.3	ENSP00000321584.4		P12268
ENSG00000290315	ENST00000703936.1 link	c.3544G>A	p.Gly1182Ser	missense_variant	Exon 21 of 22			ENSP00000515567.1		A0A994J749

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461892

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727248

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Aug 14, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1504G>A (p.G502S) alteration is located in exon 13 (coding exon 13) of the IMPDH2 gene. This alteration results from a G to A substitution at nucleotide position 1504, causing the glycine (G) at amino acid position 502 to be replaced by a serine (S). 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

Benign

0.15

BayesDel_addAF

Pathogenic

0.21

BayesDel_noAF

Uncertain

0.070

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.82

Eigen

Uncertain

0.50

Eigen_PC

Uncertain

0.59

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

M_CAP

Benign

0.033

MetaRNN

Pathogenic

0.82

MetaSVM

Benign

-0.52

MutationAssessor

Uncertain

2.7

PrimateAI

Uncertain

0.75

PROVEAN

Uncertain

-3.8

REVEL

Pathogenic

0.65

Sift

Benign

0.097

Sift4G

Benign

0.097

Polyphen

0.64

Vest4

0.84

MutPred

0.54

Gain of glycosylation at S505 (P = 0.0297);

MVP

0.90

MPC

1.5

ClinPred

0.98

GERP RS

5.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.77

gMVP

0.89

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.32

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.32

Position offset: 3

DS_DL_spliceai

0.26

Position offset: -19

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over