rs11557540

Variant names:

• chr3-49024938-T-C
• rs11557540
• NM_000884.3:c.1253A>G
• IMPDH2 p.Asp418Gly

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP2 PP3

The NM_000884.3(IMPDH2):​c.1253A>G​(p.Asp418Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 33)
• Consequence: IMPDH2 NM_000884.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.55
• Publications: 2 publications found

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]

ENSG00000290315 (HGNC:):

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 2 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: 2.503 (below the threshold of 3.09). Trascript score misZ: 3.3023 (above the threshold of 3.09).
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.821

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000884.3. 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
	IMPDH2	NM_000884.3	MANE Select	c.1253A>G	p.Asp418Gly	missense	Exon 11 of 14	NP_000875.2	P12268
	IMPDH2	NM_001410759.1		c.1325A>G	p.Asp442Gly	missense	Exon 12 of 15	NP_001397688.1	H0Y4R1
	IMPDH2	NM_001410760.1		c.1250A>G	p.Asp417Gly	missense	Exon 11 of 14	NP_001397689.1	A0A7I2YQK5

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IMPDH2	ENST00000326739.9	TSL:1 MANE Select	c.1253A>G	p.Asp418Gly	missense	Exon 11 of 14	ENSP00000321584.4	P12268
	ENSG00000290315	ENST00000703936.1		c.3293A>G	p.Asp1098Gly	missense	Exon 19 of 22	ENSP00000515567.1	A0A994J749
	IMPDH2	ENST00000937815.1		c.1421A>G	p.Asp474Gly	missense	Exon 11 of 14	ENSP00000607874.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.74
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.26
CADD	Pathogenic	30
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.78	D
Eigen	Uncertain	0.21
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Benign	0.060	D
MetaRNN	Pathogenic	0.82	D
MetaSVM	Benign	-0.54	T
MutationAssessor	Benign	0.20	N
PhyloP100		7.5
PrimateAI	Pathogenic	0.85	D
PROVEAN	Pathogenic	-5.3	D
REVEL	Pathogenic	0.70
Sift	Uncertain	0.0060	D
Sift4G	Benign	0.51	T
Varity_R		0.91
gMVP		0.94
Mutation Taster		=8/92	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		Details are displayed if max score is > 0.2

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs11557540;

hg19: chr3-49062371;