2-63857857-G-A

Variant names:

• chr2-63857857-G-A
• rs762876553
• NM_006759.4:c.176G>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_006759.4(UGP2):​c.176G>A​(p.Arg59Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000041 in 1,461,742 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: UGP2 NM_006759.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.54
• Publications: 3 publications found

Genes affected

UGP2 (HGNC:12527): (UDP-glucose pyrophosphorylase 2) The enzyme encoded by this gene is an important intermediary in mammalian carbohydrate interconversions. It transfers a glucose moiety from glucose-1-phosphate to MgUTP and forms UDP-glucose and MgPPi. In liver and muscle tissue, UDP-glucose is a direct precursor of glycogen; in lactating mammary gland it is converted to UDP-galactose which is then converted to lactose. The eukaryotic enzyme has no significant sequence similarity to the prokaryotic enzyme. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

UGP2 Gene-Disease associations (from GenCC):

• developmental and epileptic encephalopathy, 83

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.16516927).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
UGP2	NM_006759.4	c.176G>A	p.Arg59Gln	missense_variant	Exon 3 of 10	ENST00000337130.10	NP_006750.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
UGP2	ENST00000337130.10	c.176G>A	p.Arg59Gln	missense_variant	Exon 3 of 10	1	NM_006759.4	ENSP00000338703.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000796 AC: 2 AN: 251314 AF XY: 0.00000736

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.0000992

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000410 AC: 6 AN: 1461742 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727176

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.0000383 AC: 1 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39688

South Asian (SAS) AF: 0.0000348 AC: 3 AN: 86238

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53406

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111922

Other (OTH) AF: 0.00 AC: 0 AN: 60390

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000508 Hom.: 0

Bravo AF: 0.00000378

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Apr 20, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.176G>A (p.R59Q) alteration is located in exon 3 (coding exon 3) of the UGP2 gene. This alteration results from a G to A substitution at nucleotide position 176, causing the arginine (R) at amino acid position 59 to be replaced by a glutamine (Q). 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	0.063
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.53
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0026	.;T;.;T;T;.;T;.;T;T;T;.
Eigen	Benign	-0.11
Eigen_PC	Benign	0.10
FATHMM_MKL	Uncertain	0.80	D
LIST_S2	Uncertain	0.89	.;D;D;D;D;D;D;D;D;D;D;D
M_CAP	Benign	0.0027	T
MetaRNN	Benign	0.17	T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.34	.;.;.;N;.;.;.;.;.;.;.;.
PhyloP100		3.5
PrimateAI	Benign	0.39	T
PROVEAN	Benign	-0.090	N;N;N;N;.;N;N;N;N;N;N;.
REVEL	Benign	0.072
Sift	Benign	0.21	T;T;T;T;.;T;T;T;T;T;T;.
Sift4G	Benign	0.37	T;T;T;T;.;T;T;T;T;T;T;T
Polyphen		0.0, 0.0020	.;.;.;B;.;.;.;B;.;.;.;.
Vest4		0.32
MutPred		0.52		.;.;.;.;.;.;.;Loss of MoRF binding (P = 0.0345);.;.;.;.;
MVP		0.26
MPC		0.58
ClinPred		0.22	T
GERP RS		4.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.071
gMVP		0.30
Mutation Taster		=80/20	polymorphism

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

Other links and lift over

dbSNP: rs762876553; hg19: chr2-64084991; COSMIC: COSV61427265; COSMIC: COSV61427265;