14-24238704-A-G

Position:

• chr14-24238704-A-G

Variant summary

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

The NM_001002002.3(GMPR2):​c.973A>G​(p.Lys325Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,752 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: GMPR2 NM_001002002.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.32

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]

GMPR2 (HGNC:):

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	Protein	UniProt
GMPR2	NM_001002002.3	c.973A>G	p.Lys325Glu	missense_variant	10/10	ENST00000399440.7	NP_001002002.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GMPR2	ENST00000399440.7	c.973A>G	p.Lys325Glu	missense_variant	10/10	1	NM_001002002.3	ENSP00000382369.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461752 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727200

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

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

Dec 21, 2023

The c.1027A>G (p.K343E) alteration is located in exon 9 (coding exon 9) of the GMPR2 gene. This alteration results from a A to G substitution at nucleotide position 1027, causing the lysine (K) at amino acid position 343 to be replaced by a glutamic acid (E). 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	Pathogenic	0.82
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.73	.;D;D;D;.;D;.;.;.;.
Eigen	Pathogenic	0.78
Eigen_PC	Pathogenic	0.81
FATHMM_MKL	Uncertain	0.97	D
M_CAP	Benign	0.041	D
MetaRNN	Uncertain	0.50	D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.25	D
MutationAssessor	Benign	1.6	.;L;L;.;.;L;.;.;.;.
PrimateAI	Pathogenic	0.80	T
PROVEAN	Uncertain	-3.7	.;D;D;D;.;D;D;D;D;D
REVEL	Uncertain	0.62
Sift	Uncertain	0.0020	.;D;D;D;.;D;D;D;D;D
Sift4G	Benign	0.15	T;T;T;T;T;T;T;T;T;T
Polyphen		1.0, 1.0	.;D;D;.;.;D;D;.;.;.
Vest4		0.48
MVP		0.98
MPC		0.82
ClinPred		0.98	D
GERP RS		6.2
Varity_R		0.94
gMVP		0.65

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: rs1594543574; hg19: chr14-24707910;