rs72551348

Variant names:

• chr2-233767161-A-G
• rs72551348
• NM_007120.3:c.995A>G

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_007120.3(UGT1A4):​c.995A>G​(p.Gln332Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000372 in 1,614,012 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000039 (0 hom.)
• Consequence: UGT1A4 NM_007120.3 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 8.57

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:12529):

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.972
• PP5: Variant 2-233767161-A-G is Pathogenic according to our data. Variant chr2-233767161-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 12270.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-233767161-A-G is described in Lovd as [Pathogenic]. Variant chr2-233767161-A-G is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
UGT1A4	NM_007120.3	c.995A>G	p.Gln332Arg	missense_variant	Exon 2 of 5	ENST00000373409.8	NP_009051.1
UGT1A5	NM_019078.2	c.995A>G	p.Gln332Arg	missense_variant	Exon 2 of 5	ENST00000373414.4	NP_061951.1
UGT1A3	NM_019093.4	c.995A>G	p.Gln332Arg	missense_variant	Exon 2 of 5	ENST00000482026.6	NP_061966.1
UGT1A1	NM_000463.3	c.992A>G	p.Gln331Arg	missense_variant	Exon 2 of 5	ENST00000305208.10	NP_000454.1
UGT1A6	NM_001072.4	c.989A>G	p.Gln330Arg	missense_variant	Exon 2 of 5	ENST00000305139.11	NP_001063.2
UGT1A10	NM_019075.4	c.983A>G	p.Gln328Arg	missense_variant	Exon 2 of 5	ENST00000344644.10	NP_061948.1
UGT1A8	NM_019076.5	c.983A>G	p.Gln328Arg	missense_variant	Exon 2 of 5	ENST00000373450.5	NP_061949.3
UGT1A7	NM_019077.3	c.983A>G	p.Gln328Arg	missense_variant	Exon 2 of 5	ENST00000373426.4	NP_061950.2
UGT1A9	NM_021027.3	c.983A>G	p.Gln328Arg	missense_variant	Exon 2 of 5	ENST00000354728.5	NP_066307.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
UGT1A4	ENST00000373409.8	c.995A>G	p.Gln332Arg	missense_variant	Exon 2 of 5	1	NM_007120.3	ENSP00000362508.4
UGT1A5	ENST00000373414.4	c.995A>G	p.Gln332Arg	missense_variant	Exon 2 of 5	1	NM_019078.2	ENSP00000362513.3
UGT1A3	ENST00000482026.6	c.995A>G	p.Gln332Arg	missense_variant	Exon 2 of 5	1	NM_019093.4	ENSP00000418532.1
UGT1A1	ENST00000305208.10	c.992A>G	p.Gln331Arg	missense_variant	Exon 2 of 5	1	NM_000463.3	ENSP00000304845.5
UGT1A6	ENST00000305139.11	c.989A>G	p.Gln330Arg	missense_variant	Exon 2 of 5	1	NM_001072.4	ENSP00000303174.6
UGT1A10	ENST00000344644.10	c.983A>G	p.Gln328Arg	missense_variant	Exon 2 of 5	1	NM_019075.4	ENSP00000343838.5
UGT1A9	ENST00000354728.5	c.983A>G	p.Gln328Arg	missense_variant	Exon 2 of 5	1	NM_021027.3	ENSP00000346768.4
UGT1A7	ENST00000373426.4	c.983A>G	p.Gln328Arg	missense_variant	Exon 2 of 5	1	NM_019077.3	ENSP00000362525.3
UGT1A8	ENST00000373450.5	c.983A>G	p.Gln328Arg	missense_variant	Exon 2 of 5	1	NM_019076.5	ENSP00000362549.4

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152230 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.00000402 AC: 1 AN: 248972 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 134772

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000898

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000390 AC: 57 AN: 1461782 Hom.: 0 Cov.: 33 AF XY: 0.0000440 AC XY: 32 AN XY: 727188

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000468

Gnomad4 OTH exome AF: 0.0000828

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152230 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74374

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000422 Hom.: 0

Bravo AF: 0.0000189

EpiCase AF: 0.000109

EpiControl AF: 0.00

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Aug 25, 2022

Mayo Clinic Laboratories, Mayo Clinic

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PP3, PM2, PM3_supporting, PS3 -

Dec 27, 2022

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The UGT1A1 c.992A>G; p.Gln331Arg variant (rs72551348) is reported in the literature in the homozygous state in an individual affected with Crigler-Najjar syndrome type 2 (Moghrabi 1993). This variant is reported in ClinVar (Variation ID: 12270), and is only observed on one allele in the Genome Aggregation Database, indicating it is not a common polymorphism. The glutamine at codon 331 is highly conserved, and computational analyses (SIFT, PolyPhen-2) predict that this variant is deleterious. Functional analyses of the variant protein show a loss of activity in a transformed cell line (Sneitz 2010). However, given the limited clinical and functional data, the significance of the p.Gln331Arg variant is uncertain at this time. References: Moghrabi N et al. Identification of an A-to-G missense mutation in exon 2 of the UGT1 gene complex that causes Crigler-Najjar syndrome type 2. Genomics. 1993;18(1):171-173. Sneitz N et al. Crigler-Najjar syndrome in The Netherlands: identification of four novel UGT1A1 alleles, genotype-phenotype correlation, and functional analysis of 10 missense mutants. Hum Mutat. 2010;31(1):52-59. -

Oct 31, 2017

Genetic Services Laboratory, University of Chicago

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

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 Pathogenic:1

May 13, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Crigler-Najjar syndrome, type II Pathogenic:1

Oct 01, 1993

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.82
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.29
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.62	D;D;.;D;D;.;D;.;T;T;T;D;.
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.89
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.68	T;T;T;T;T;T;T;T;T;T;T;T;T
M_CAP	Uncertain	0.28	D
MetaRNN	Pathogenic	0.97	D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.27	D
MutationAssessor	Pathogenic	4.2	.;.;.;H;.;.;.;.;.;.;.;.;.
PrimateAI	Uncertain	0.65	T
PROVEAN	Uncertain	-2.8	D;D;N;D;D;D;D;D;D;D;D;D;D
REVEL	Pathogenic	0.75
Sift	Pathogenic	0.0	D;D;D;D;D;D;D;D;D;D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D;D;D;D;D;D;D;D;D;D
Polyphen		1.0	D;D;.;D;D;.;D;.;D;D;D;D;.
Vest4		0.79
MutPred		0.93		.;.;.;.;.;.;.;.;Gain of MoRF binding (P = 0.0142);Gain of MoRF binding (P = 0.0142);Gain of MoRF binding (P = 0.0142);.;.;
MVP		0.91
MPC		0.22, 0.35, 0.54, 0.53, 0.71, 0.21, 0.21, 0.57
ClinPred		1.0	D
GERP RS		5.8
Varity_R		0.93
gMVP		0.73

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: rs72551348; hg19: chr2-234675807;