2-63884032-A-G

Variant names:

• chr2-63884032-A-G
• NM_006759.4:c.514A>G

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.514A>G​(p.Lys172Glu) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/22 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)
• Consequence: UGP2 NM_006759.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.09
• Publications: 0 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=0.2379837).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
UGP2	NM_006759.4	c.514A>G	p.Lys172Glu	missense_variant	Exon 5 of 10	ENST00000337130.10	NP_006750.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
UGP2	ENST00000337130.10	c.514A>G	p.Lys172Glu	missense_variant	Exon 5 of 10	1	NM_006759.4	ENSP00000338703.5

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

Inborn genetic diseases Uncertain:1

Feb 05, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.514A>G (p.K172E) alteration is located in exon 5 (coding exon 5) of the UGP2 gene. This alteration results from a A to G substitution at nucleotide position 514, causing the lysine (K) at amino acid position 172 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	Benign	0.18
BayesDel_addAF	Uncertain	0.015	T
BayesDel_noAF	Benign	-0.22
CADD	Benign	21
DANN	Benign	0.96
DEOGEN2	Benign	0.092	.;.;T;T;.;T;T;.
Eigen	Benign	-0.16
Eigen_PC	Benign	0.073
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.94	.;D;D;D;D;D;D;D
M_CAP	Benign	0.010	T
MetaRNN	Benign	0.24	T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.98	.;.;L;.;.;.;.;.
PhyloP100		7.1
PrimateAI	Uncertain	0.77	T
PROVEAN	Benign	0.32	N;N;N;N;N;N;N;.
REVEL	Benign	0.21
Sift	Benign	1.0	T;T;T;T;T;T;T;.
Sift4G	Benign	0.85	T;T;T;T;T;T;T;T
Polyphen		0.0040, 0.016	.;.;B;.;B;.;.;.
Vest4		0.69
MutPred		0.51		.;.;.;.;Loss of ubiquitination at K181 (P = 0.021);.;.;.;
MVP		0.15
MPC		0.72
ClinPred		0.68	D
GERP RS		5.7
Varity_R		0.42
gMVP		0.78
Mutation Taster		=45/55	disease causing

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

Other links and lift over

hg19: chr2-64111166;