Genetic Variant UGP2:p.Pro81His (chr2-63857923-C-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_006759.4(UGP2):c.242C>A(p.Pro81His) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,461,106 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: 0.0000014 ( 0 hom. )

Consequence

UGP2
NM_006759.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.11

Publications

1 publications found

Variant links:

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

UGP2 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
UGP2	NM_006759.4 link	c.242C>A	p.Pro81His	missense_variant	Exon 3 of 10	ENST00000337130.10	NP_006750.3	Q16851-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
UGP2	ENST00000337130.10 link	c.242C>A	p.Pro81His	missense_variant	Exon 3 of 10	1	NM_006759.4	ENSP00000338703.5		Q16851-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461106

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726854

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33416

American (AMR)

AF:

0.00

AC:

AN:

44558

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26110

East Asian (EAS)

AF:

0.00

AC:

AN:

39674

South Asian (SAS)

AF:

0.00

AC:

AN:

86118

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53400

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

9.00e-7

AC:

AN:

1111706

Other (OTH)

AF:

0.0000166

AC:

AN:

60360

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

May 17, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.242C>A (p.P81H) alteration is located in exon 3 (coding exon 3) of the UGP2 gene. This alteration results from a C to A substitution at nucleotide position 242, causing the proline (P) at amino acid position 81 to be replaced by a histidine (H). 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

0.96

BayesDel_addAF

Uncertain

0.060

BayesDel_noAF

Benign

-0.15

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.21

.;T;.;T;T;.;T;.;T;T;T;.

Eigen

Pathogenic

0.86

Eigen_PC

Pathogenic

0.80

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.92

.;D;D;D;D;D;D;D;D;D;D;D

M_CAP

Benign

0.059

MetaRNN

Uncertain

0.73

D;D;D;D;D;D;D;D;D;D;D;D

MetaSVM

Benign

-0.63

MutationAssessor

Uncertain

2.6

.;.;.;M;.;.;.;.;.;.;.;.

PhyloP100

5.1

PrimateAI

Uncertain

0.79

PROVEAN

Benign

-1.8

N;D;N;N;.;D;D;N;D;D;D;.

REVEL

Uncertain

0.33

Sift

Uncertain

0.010

D;D;D;D;.;D;D;D;D;D;D;.

Sift4G

Uncertain

0.0080

D;D;D;D;.;D;D;D;D;D;D;D

Polyphen

1.0

.;.;.;D;.;.;.;D;.;.;.;.

Vest4

0.72

MutPred

0.70

.;.;.;.;.;.;.;Loss of catalytic residue at P90 (P = 0.0023);.;.;.;.;

MVP

0.66

MPC

1.5

ClinPred

0.94

GERP RS

5.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.38

gMVP

0.73

Mutation Taster

=30/70

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over