chr2-233767767-T-C

Variant names:

• chr2-233767767-T-C
• rs2302538
• NM_007120.3:c.1000-82T>C

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_007120.3(UGT1A4):​c.1000-82T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.139 in 1,608,838 control chromosomes in the GnomAD database, including 18,348 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.19 (3829 hom., cov: 32)
  • Exomes 𝑓: 0.13 (14519 hom.)
• Consequence: UGT1A4 NM_007120.3 intron
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -1.12
• Publications: 20 publications found

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

Our verdict: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BP6: Variant 2-233767767-T-C is Benign according to our data. Variant chr2-233767767-T-C is described in ClinVar as Benign. ClinVar VariationId is 1277377.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.372 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
UGT1A4	NM_007120.3	c.1000-82T>C		intron_variant	Intron 2 of 4	ENST00000373409.8	NP_009051.1
UGT1A5	NM_019078.2	c.1000-82T>C		intron_variant	Intron 2 of 4	ENST00000373414.4	NP_061951.1
UGT1A3	NM_019093.4	c.1000-82T>C		intron_variant	Intron 2 of 4	ENST00000482026.6	NP_061966.1
UGT1A1	NM_000463.3	c.997-82T>C		intron_variant	Intron 2 of 4	ENST00000305208.10	NP_000454.1
UGT1A6	NM_001072.4	c.994-82T>C		intron_variant	Intron 2 of 4	ENST00000305139.11	NP_001063.2
UGT1A10	NM_019075.4	c.988-82T>C		intron_variant	Intron 2 of 4	ENST00000344644.10	NP_061948.1
UGT1A8	NM_019076.5	c.988-82T>C		intron_variant	Intron 2 of 4	ENST00000373450.5	NP_061949.3
UGT1A7	NM_019077.3	c.988-82T>C		intron_variant	Intron 2 of 4	ENST00000373426.4	NP_061950.2
UGT1A9	NM_021027.3	c.988-82T>C		intron_variant	Intron 2 of 4	ENST00000354728.5	NP_066307.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
UGT1A4	ENST00000373409.8	c.1000-82T>C		intron_variant	Intron 2 of 4	1	NM_007120.3	ENSP00000362508.4
UGT1A5	ENST00000373414.4	c.1000-82T>C		intron_variant	Intron 2 of 4	1	NM_019078.2	ENSP00000362513.3
UGT1A3	ENST00000482026.6	c.1000-82T>C		intron_variant	Intron 2 of 4	1	NM_019093.4	ENSP00000418532.1
UGT1A1	ENST00000305208.10	c.997-82T>C		intron_variant	Intron 2 of 4	1	NM_000463.3	ENSP00000304845.5
UGT1A6	ENST00000305139.11	c.994-82T>C		intron_variant	Intron 2 of 4	1	NM_001072.4	ENSP00000303174.6
UGT1A10	ENST00000344644.10	c.988-82T>C		intron_variant	Intron 2 of 4	1	NM_019075.4	ENSP00000343838.5
UGT1A9	ENST00000354728.5	c.988-82T>C		intron_variant	Intron 2 of 4	1	NM_021027.3	ENSP00000346768.4
UGT1A7	ENST00000373426.4	c.988-82T>C		intron_variant	Intron 2 of 4	1	NM_019077.3	ENSP00000362525.3
UGT1A8	ENST00000373450.5	c.988-82T>C		intron_variant	Intron 2 of 4	1	NM_019076.5	ENSP00000362549.4

Frequencies

GnomAD3 genomes AF: 0.190 AC: 28865 AN: 152064 Hom.: 3800 Cov.: 32

Gnomad AFR AF: 0.376

Gnomad AMI AF: 0.0581

Gnomad AMR AF: 0.116

Gnomad ASJ AF: 0.154

Gnomad EAS AF: 0.0556

Gnomad SAS AF: 0.138

Gnomad FIN AF: 0.0890

Gnomad MID AF: 0.168

Gnomad NFE AF: 0.127

Gnomad OTH AF: 0.181

GnomAD4 exome AF: 0.133 AC: 193940 AN: 1456656 Hom.: 14519 AF XY: 0.133 AC XY: 96205 AN XY: 724060

African (AFR) AF: 0.380 AC: 12703 AN: 33406

American (AMR) AF: 0.0835 AC: 3689 AN: 44206

Ashkenazi Jewish (ASJ) AF: 0.156 AC: 4075 AN: 26056

East Asian (EAS) AF: 0.0496 AC: 1966 AN: 39646

South Asian (SAS) AF: 0.141 AC: 12025 AN: 85536

European-Finnish (FIN) AF: 0.0863 AC: 4518 AN: 52380

Middle Eastern (MID) AF: 0.171 AC: 985 AN: 5766

European-Non Finnish (NFE) AF: 0.131 AC: 145308 AN: 1109420

Other (OTH) AF: 0.144 AC: 8671 AN: 60240

GnomAD4 genome AF: 0.190 AC: 28947 AN: 152182 Hom.: 3829 Cov.: 32 AF XY: 0.183 AC XY: 13627 AN XY: 74418

African (AFR) AF: 0.377 AC: 15647 AN: 41484

American (AMR) AF: 0.116 AC: 1774 AN: 15298

Ashkenazi Jewish (ASJ) AF: 0.154 AC: 535 AN: 3472

East Asian (EAS) AF: 0.0555 AC: 288 AN: 5186

South Asian (SAS) AF: 0.137 AC: 661 AN: 4820

European-Finnish (FIN) AF: 0.0890 AC: 944 AN: 10606

Middle Eastern (MID) AF: 0.170 AC: 50 AN: 294

European-Non Finnish (NFE) AF: 0.127 AC: 8605 AN: 67998

Other (OTH) AF: 0.185 AC: 390 AN: 2112

Alfa AF: 0.140 Hom.: 2524

Bravo AF: 0.200

Asia WGS AF: 0.122 AC: 426 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Gilbert syndrome Benign:1

Jun 28, 2025

Immunogenetics and Transplant Biology Service, University Hospital "Città della Salute e della Scienza di Torino"

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Benign:1

Jul 10, 2018

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.32
DANN	Benign	0.41
PhyloP100		-1.1
Mutation Taster		=100/0	polymorphism (auto)

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

dbSNP: rs2302538; hg19: chr2-234676413; COSMIC: COSV59392617; COSMIC: COSV59392617;