14-24233594-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001002002.3(GMPR2):c.203G>T(p.Cys68Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: GMPR2 NM_001002002.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.12

Genes affected

GMPR2 (HGNC:4377): (guanosine monophosphate reductase 2) This gene encodes an enzyme that catalyzes the irreversible and NADPH-dependent reductive deamination of guanosine monophosphate (GMP) to inosine monophosphate (IMP). The protein also functions in the re-utilization of free intracellular bases and purine nucleosides. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Apr 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GMPR2	NM_001002002.3	c.203G>T	p.Cys68Phe	missense_variant	3/10	ENST00000399440.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GMPR2	ENST00000399440.7	c.203G>T	p.Cys68Phe	missense_variant	3/10	1	NM_001002002.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 06, 2023

The c.257G>T (p.C86F) alteration is located in exon 2 (coding exon 2) of the GMPR2 gene. This alteration results from a G to T substitution at nucleotide position 257, causing the cysteine (C) at amino acid position 86 to be replaced by a phenylalanine (F). 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	0.21
BayesDel_addAF	Uncertain	0.056	T
BayesDel_noAF	Benign	-0.16
Cadd	Uncertain	24
Dann	Benign	0.97
Eigen	Benign	0.036
Eigen_PC	Benign	0.14
FATHMM_MKL	Uncertain	0.90	D
M_CAP	Benign	0.048	D
MetaRNN	Uncertain	0.59	D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.37	T
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.50	T
Sift4G	Uncertain	0.0080	D;D;D;D;D;T;D;D;D;D;D;D;D
Polyphen		0.48, 0.58	.;P;P;.;.;.;.;.;P;P;.;.;.
Vest4		0.46
MutPred		0.66		Loss of methylation at K69 (P = 0.0286);Loss of methylation at K69 (P = 0.0286);Loss of methylation at K69 (P = 0.0286);Loss of methylation at K69 (P = 0.0286);Loss of methylation at K69 (P = 0.0286);Loss of methylation at K69 (P = 0.0286);Loss of methylation at K69 (P = 0.0286);.;Loss of methylation at K69 (P = 0.0286);.;.;.;Loss of methylation at K69 (P = 0.0286);
MVP		0.91
MPC		0.29
ClinPred		0.89	D
GERP RS		4.1
Varity_R		0.90
gMVP		0.84

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: chr14-24702800;