14-24233522-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001002002.3(GMPR2):c.131C>T(p.Thr44Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000239 in 1,613,974 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00022 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00024 (1 hom.)
• Consequence: GMPR2 NM_001002002.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.513

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 Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.011976957).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GMPR2	NM_001002002.3	c.131C>T	p.Thr44Ile	missense_variant	3/10	ENST00000399440.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GMPR2	ENST00000399440.7	c.131C>T	p.Thr44Ile	missense_variant	3/10	1	NM_001002002.3	P1

Frequencies

GnomAD3 genomes AF: 0.000223 AC: 34 AN: 152214 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00317

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000294

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.000337 AC: 84 AN: 249506 Hom.: 0 AF XY: 0.000295 AC XY: 40 AN XY: 135370

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00417

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000362

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000241 AC: 352 AN: 1461642 Hom.: 1 Cov.: 31 AF XY: 0.000249 AC XY: 181 AN XY: 727152

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00501

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 0.000170

Gnomad4 OTH exome AF: 0.000364

GnomAD4 genome AF: 0.000223 AC: 34 AN: 152332 Hom.: 0 Cov.: 32 AF XY: 0.000148 AC XY: 11 AN XY: 74480

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00317

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000294

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.000526 Hom.: 0

Bravo AF: 0.000223

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.00 AC: 0

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000477 AC: 4

ExAC AF: 0.000339 AC: 41

Asia WGS AF: 0.000577 AC: 2 AN: 3478

EpiCase AF: 0.000436

EpiControl AF: 0.000593

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

Oct 21, 2021

The c.185C>T (p.T62I) alteration is located in exon 2 (coding exon 2) of the GMPR2 gene. This alteration results from a C to T substitution at nucleotide position 185, causing the threonine (T) at amino acid position 62 to be replaced by an isoleucine (I). 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	0.080
BayesDel_addAF	Benign	-0.31	T
BayesDel_noAF	Benign	-0.37
Cadd	Benign	14
Dann	Benign	0.97
Eigen	Benign	-0.90
Eigen_PC	Benign	-0.81
FATHMM_MKL	Benign	0.068	N
M_CAP	Benign	0.0095	T
MetaRNN	Benign	0.012	T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationTaster	Benign	0.97	N;N;N;N;N;N;N;N;N
PrimateAI	Benign	0.29	T
Sift4G	Benign	0.10	T;T;T;T;T;T;T;T;T;T;T;T;T
Polyphen		0.0010, 0.010	.;B;B;.;.;.;.;.;B;B;.;.;.
Vest4		0.15
MVP		0.57
MPC		0.19
ClinPred		0.018	T
GERP RS		0.14
Varity_R		0.28
gMVP		0.25

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

LitVar

Other links and lift over

dbSNP: rs201546406; hg19: chr14-24702728;