rs114982090

Positions:

• chr2-233772309-C-T

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 3P and 4B. PM2 PP3 BP4_Strong

The NM_007120.3(UGT1A4):​c.1355C>T​(p.Pro452Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000234 in 1,614,206 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00024 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00023 (0 hom.)
• Consequence: UGT1A4 NM_007120.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4 B:1
• Conservation: PhyloP100: 7.79

Genes affected

UGT1A4 (HGNC:12536): (UDP glucuronosyltransferase family 1 member A4) This gene encodes a UDP-glucuronosyltransferase, an enzyme of the glucuronidation pathway that transforms small lipophilic molecules, such as steroids, bilirubin, hormones, and drugs, into water-soluble, excretable metabolites. This gene is part of a complex locus that encodes several UDP-glucuronosyltransferases. The locus includes thirteen unique alternate first exons followed by four common exons. Four of the alternate first exons are considered pseudogenes. Each of the remaining nine 5' exons may be spliced to the four common exons, resulting in nine proteins with different N-termini and identical C-termini. Each first exon encodes the substrate binding site, and is regulated by its own promoter. This enzyme has some glucuronidase activity towards bilirubin, although is is more active on amines, steroids, and sapogenins. [provided by RefSeq, Jul 2008]

UGT1A5 (HGNC:12537): (UDP glucuronosyltransferase family 1 member A5) This gene encodes a UDP-glucuronosyltransferase, an enzyme of the glucuronidation pathway that transforms small lipophilic molecules, such as steroids, bilirubin, hormones, and drugs, into water-soluble, excretable metabolites. This gene is part of a complex locus that encodes several UDP-glucuronosyltransferases. The locus includes thirteen unique alternate first exons followed by four common exons. Four of the alternate first exons are considered pseudogenes. Each of the remaining nine 5' exons may be spliced to the four common exons, resulting in nine proteins with different N-termini and identical C-termini. Each first exon encodes the substrate binding site, and is regulated by its own promoter. [provided by RefSeq, Jul 2008]

UGT1A3 (HGNC:12535): (UDP glucuronosyltransferase family 1 member A3) This gene encodes a UDP-glucuronosyltransferase, an enzyme of the glucuronidation pathway that transforms small lipophilic molecules, such as steroids, bilirubin, hormones, and drugs, into water-soluble, excretable metabolites. This gene is part of a complex locus that encodes several UDP-glucuronosyltransferases. The locus includes thirteen unique alternate first exons followed by four common exons. Four of the alternate first exons are considered pseudogenes. Each of the remaining nine 5' exons may be spliced to the four common exons, resulting in nine proteins with different N-termini and identical C-termini. Each first exon encodes the substrate binding site, and is regulated by its own promoter. Substrates of this enzyme include estrone, 2-hydroxyestrone, and metabolites of benzo alpha-pyrene. [provided by RefSeq, Jul 2008]

UGT1A1 (HGNC:12530): (UDP glucuronosyltransferase family 1 member A1) This gene encodes a UDP-glucuronosyltransferase, an enzyme of the glucuronidation pathway that transforms small lipophilic molecules, such as steroids, bilirubin, hormones, and drugs, into water-soluble, excretable metabolites. This gene is part of a complex locus that encodes several UDP-glucuronosyltransferases. The locus includes thirteen unique alternate first exons followed by four common exons. Four of the alternate first exons are considered pseudogenes. Each of the remaining nine 5' exons may be spliced to the four common exons, resulting in nine proteins with different N-termini and identical C-termini. Each first exon encodes the substrate binding site, and is regulated by its own promoter. The preferred substrate of this enzyme is bilirubin, although it also has moderate activity with simple phenols, flavones, and C18 steroids. Mutations in this gene result in Crigler-Najjar syndromes types I and II and in Gilbert syndrome. [provided by RefSeq, Jul 2008]

UGT1A6 (HGNC:12538): (UDP glucuronosyltransferase family 1 member A6) This gene encodes a UDP-glucuronosyltransferase, an enzyme of the glucuronidation pathway that transforms small lipophilic molecules, such as steroids, bilirubin, hormones, and drugs, into water-soluble, excretable metabolites. This gene is part of a complex locus that encodes several UDP-glucuronosyltransferases. The locus includes thirteen unique alternate first exons followed by four common exons. Four of the alternate first exons are considered pseudogenes. Each of the remaining nine 5' exons may be spliced to the four common exons, resulting in nine proteins with different N-termini and identical C-termini. Each first exon encodes the substrate binding site, and is regulated by its own promoter. The enzyme encoded by this gene is active on phenolic and planar compounds. Alternative splicing in the unique 5' end of this gene results in two transcript variants. [provided by RefSeq, Jul 2008]

UGT1A10 (HGNC:12531): (UDP glucuronosyltransferase family 1 member A10) This gene encodes a UDP-glucuronosyltransferase, an enzyme of the glucuronidation pathway that transforms small lipophilic molecules, such as steroids, bilirubin, hormones, and drugs, into water-soluble, excretable metabolites. This gene is part of a complex locus that encodes several UDP-glucuronosyltransferases. The locus includes thirteen unique alternate first exons followed by four common exons. Four of the alternate first exons are considered pseudogenes. Each of the remaining nine 5' exons may be spliced to the four common exons, resulting in nine proteins with different N-termini and identical C-termini. Each first exon encodes the substrate binding site, and is regulated by its own promoter. The enzyme encoded by this gene has glucuronidase activity on mycophenolic acid, coumarins, and quinolines. [provided by RefSeq, Jul 2008]

UGT1A8 (HGNC:12540): (UDP glucuronosyltransferase family 1 member A8) This gene encodes a UDP-glucuronosyltransferase, an enzyme of the glucuronidation pathway that transforms small lipophilic molecules, such as steroids, bilirubin, hormones, and drugs, into water-soluble, excretable metabolites. This gene is part of a complex locus that encodes several UDP-glucuronosyltransferases. The locus includes thirteen unique alternate first exons followed by four common exons. Four of the alternate first exons are considered pseudogenes. Each of the remaining nine 5' exons may be spliced to the four common exons, resulting in nine proteins with different N-termini and identical C-termini. Each first exon encodes the substrate binding site, and is regulated by its own promoter. The enzyme encoded by this gene has glucuronidase activity with many substrates including coumarins, phenols, anthraquinones, flavones, and some opioids. [provided by RefSeq, Jul 2008]

UGT1A7 (HGNC:12539): (UDP glucuronosyltransferase family 1 member A7) This gene encodes a UDP-glucuronosyltransferase, an enzyme of the glucuronidation pathway that transforms small lipophilic molecules, such as steroids, bilirubin, hormones, and drugs, into water-soluble, excretable metabolites. This gene is part of a complex locus that encodes several UDP-glucuronosyltransferases. The locus includes thirteen unique alternate first exons followed by four common exons. Four of the alternate first exons are considered pseudogenes. Each of the remaining nine 5' exons may be spliced to the four common exons, resulting in nine proteins with different N-termini and identical C-termini. Each first exon encodes the substrate binding site, and is regulated by its own promoter. The enzyme encoded by this gene has moderate glucuronidase activity with phenols. [provided by RefSeq, Jul 2008]

UGT1A9 (HGNC:12541): (UDP glucuronosyltransferase family 1 member A9) This gene encodes a UDP-glucuronosyltransferase, an enzyme of the glucuronidation pathway that transforms small lipophilic molecules, such as steroids, bilirubin, hormones, and drugs, into water-soluble, excretable metabolites. This gene is part of a complex locus that encodes several UDP-glucuronosyltransferases. The locus includes thirteen unique alternate first exons followed by four common exons. Four of the alternate first exons are considered pseudogenes. Each of the remaining nine 5' exons may be spliced to the four common exons, resulting in nine proteins with different N-termini and identical C-termini. Each first exon encodes the substrate binding site, and is regulated by its own promoter. The enzyme encoded by this gene is active on phenols. [provided by RefSeq, Jul 2008]

UGT1A (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Multiple lines of computational evidence support a deleterious effect 8: BayesDel_noAF, Cadd, Dann, Eigen, M_CAP, phyloP100way_vertebrate, PROVEAN, REVEL [when AlphaMissense, max_spliceai, FATHMM_MKL, MetaRNN, MutationTaster was below the threshold]
• BP4: Computational evidence support a benign effect (MetaRNN=0.030352622).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
UGT1A4	NM_007120.3	c.1355C>T	p.Pro452Leu	missense_variant	5/5	ENST00000373409.8	NP_009051.1
UGT1A5	NM_019078.2	c.1355C>T	p.Pro452Leu	missense_variant	5/5	ENST00000373414.4	NP_061951.1
UGT1A3	NM_019093.4	c.1355C>T	p.Pro452Leu	missense_variant	5/5	ENST00000482026.6	NP_061966.1
UGT1A1	NM_000463.3	c.1352C>T	p.Pro451Leu	missense_variant	5/5	ENST00000305208.10	NP_000454.1
UGT1A6	NM_001072.4	c.1349C>T	p.Pro450Leu	missense_variant	5/5	ENST00000305139.11	NP_001063.2
UGT1A10	NM_019075.4	c.1343C>T	p.Pro448Leu	missense_variant	5/5	ENST00000344644.10	NP_061948.1
UGT1A8	NM_019076.5	c.1343C>T	p.Pro448Leu	missense_variant	5/5	ENST00000373450.5	NP_061949.3
UGT1A7	NM_019077.3	c.1343C>T	p.Pro448Leu	missense_variant	5/5	ENST00000373426.4	NP_061950.2
UGT1A9	NM_021027.3	c.1343C>T	p.Pro448Leu	missense_variant	5/5	ENST00000354728.5	NP_066307.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
UGT1A4	ENST00000373409.8	c.1355C>T	p.Pro452Leu	missense_variant	5/5	1	NM_007120.3	ENSP00000362508.4
UGT1A5	ENST00000373414.4	c.1355C>T	p.Pro452Leu	missense_variant	5/5	1	NM_019078.2	ENSP00000362513.3
UGT1A3	ENST00000482026.6	c.1355C>T	p.Pro452Leu	missense_variant	5/5	1	NM_019093.4	ENSP00000418532.1
UGT1A1	ENST00000305208.10	c.1352C>T	p.Pro451Leu	missense_variant	5/5	1	NM_000463.3	ENSP00000304845.5
UGT1A6	ENST00000305139.11	c.1349C>T	p.Pro450Leu	missense_variant	5/5	1	NM_001072.4	ENSP00000303174.6
UGT1A10	ENST00000344644.10	c.1343C>T	p.Pro448Leu	missense_variant	5/5	1	NM_019075.4	ENSP00000343838.5
UGT1A9	ENST00000354728.5	c.1343C>T	p.Pro448Leu	missense_variant	5/5	1	NM_021027.3	ENSP00000346768.4
UGT1A7	ENST00000373426.4	c.1343C>T	p.Pro448Leu	missense_variant	5/5	1	NM_019077.3	ENSP00000362525.3
UGT1A8	ENST00000373450.5	c.1343C>T	p.Pro448Leu	missense_variant	5/5	1	NM_019076.5	ENSP00000362549.4

Frequencies

GnomAD3 genomes AF: 0.000237 AC: 36 AN: 152200 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00521

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000118

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000460 AC: 115 AN: 249824 Hom.: 0 AF XY: 0.000414 AC XY: 56 AN XY: 135214

Gnomad AFR exome AF: 0.0000615

Gnomad AMR exome AF: 0.0000578

Gnomad ASJ exome AF: 0.000199

Gnomad EAS exome AF: 0.00533

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000713

Gnomad OTH exome AF: 0.000490

GnomAD4 exome AF: 0.000233 AC: 341 AN: 1461888 Hom.: 0 Cov.: 33 AF XY: 0.000216 AC XY: 157 AN XY: 727248

Gnomad4 AFR exome AF: 0.0000896

Gnomad4 AMR exome AF: 0.0000447

Gnomad4 ASJ exome AF: 0.000191

Gnomad4 EAS exome AF: 0.00277

Gnomad4 SAS exome AF: 0.0000464

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000180

Gnomad4 OTH exome AF: 0.000281

GnomAD4 genome AF: 0.000236 AC: 36 AN: 152318 Hom.: 0 Cov.: 32 AF XY: 0.000242 AC XY: 18 AN XY: 74472

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00522

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000118

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000240 Hom.: 0

Bravo AF: 0.000276

TwinsUK AF: 0.000809 AC: 3

ALSPAC AF: 0.000259 AC: 1

ExAC AF: 0.000404 AC: 49

Asia WGS AF: 0.000577 AC: 2 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Aug 27, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Jul 14, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 17, 2023	- -

Crigler-Najjar syndrome type 1;C0017551:Gilbert syndrome;C0270210:Lucey-Driscoll syndrome;C1866173:Bilirubin, serum level of, quantitative trait locus 1;C2931132:Crigler-Najjar syndrome, type II Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

May 06, 2022

- -

UGT1A1-related disorder Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Sep 24, 2024

The UGT1A1 c.1352C>T variant is predicted to result in the amino acid substitution p.Pro451Leu. This variant has been reported in a patient with hereditary spherocytosis (Patient 19, Table S6, Choi et al. 2019. PubMed ID: 31122244), in combination with a second UGT1A1 variant and another variant in the ANK1 gene. It has also been reported in an infant with biliary atresia (Laochareonsuk. 2022. PubMed ID: 36350824) and an infant with severe hyperbilirubinemia (Yang. 2016. PubMed ID: 26727668). However, this variant is reported in 0.53% of alleles in individuals of East Asian descent in gnomAD, which may be too frequent to be a primary cause of disease. Although we suspect that this variant may be benign, at this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.29
BayesDel_addAF	Uncertain	0.024	T
BayesDel_noAF	Pathogenic	0.26
CADD	Pathogenic	32
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.67	D;D;D;D;.;D;T;D;D;D
Eigen	Pathogenic	0.90
Eigen_PC	Pathogenic	0.84
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.87	D;T;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.35	D
MetaRNN	Benign	0.030	T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.43	D
MutationAssessor	Uncertain	2.6	.;.;M;.;.;.;.;.;.;.
PrimateAI	Uncertain	0.63	T
PROVEAN	Pathogenic	-6.4	D;D;D;D;D;D;D;D;D;D
REVEL	Pathogenic	0.81
Sift	Uncertain	0.0030	D;D;D;D;D;D;D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D;D;D;D;D;D;D
Polyphen		1.0	D;D;D;D;.;D;D;D;D;D
Vest4		0.67
MVP		0.98
MPC		0.21, 0.34, 0.53, 0.52, 0.69, 0.21, 0.20, 0.56
ClinPred		0.21	T
GERP RS		5.8
Varity_R		0.68
gMVP		0.55

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: rs114982090; hg19: chr2-234680955;