2-233671942-G-A

Position:

• chr2-233671942-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP6

The NM_021027.3(UGT1A9):​c.8G>A​(p.Cys3Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00109 in 1,610,580 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (no stars).

• Frequency:
  • Genomes: 𝑓 0.00087 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0011 (1 hom.)
• Consequence: UGT1A9 NM_021027.3 missense
• Clinical Significance: Likely benign no assertion criteria provided B:1
• Conservation: PhyloP100: 0.404

Genes affected

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]

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]

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.0058830082).
• BP6: Variant 2-233671942-G-A is Benign according to our data. Variant chr2-233671942-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 3358191.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
UGT1A9	NM_021027.3	c.8G>A	p.Cys3Tyr	missense_variant	1/5	ENST00000354728.5	NP_066307.1
UGT1A10	NM_019075.4	c.855+34565G>A		intron_variant		ENST00000344644.10	NP_061948.1
UGT1A8	NM_019076.5	c.855+53380G>A		intron_variant		ENST00000373450.5	NP_061949.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
UGT1A9	ENST00000354728.5	c.8G>A	p.Cys3Tyr	missense_variant	1/5	1	NM_021027.3	ENSP00000346768	P1
UGT1A10	ENST00000344644.10	c.855+34565G>A		intron_variant		1	NM_019075.4	ENSP00000343838	P1
UGT1A8	ENST00000373450.5	c.855+53380G>A		intron_variant		1	NM_019076.5	ENSP00000362549	P1
UGT1A10	ENST00000373445.1	c.855+34565G>A		intron_variant		1		ENSP00000362544

Frequencies

GnomAD3 genomes AF: 0.000874 AC: 133 AN: 152216 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000555

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00137

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: 0.00126

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.000870 AC: 215 AN: 247208 Hom.: 0 AF XY: 0.000832 AC XY: 111 AN XY: 133404

Gnomad AFR exome AF: 0.000246

Gnomad AMR exome AF: 0.00189

Gnomad ASJ exome AF: 0.000103

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000942

Gnomad NFE exome AF: 0.00118

Gnomad OTH exome AF: 0.00183

GnomAD4 exome AF: 0.00111 AC: 1615 AN: 1458246 Hom.: 1 Cov.: 33 AF XY: 0.00103 AC XY: 747 AN XY: 725202

Gnomad4 AFR exome AF: 0.000209

Gnomad4 AMR exome AF: 0.00193

Gnomad4 ASJ exome AF: 0.0000387

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000117

Gnomad4 FIN exome AF: 0.0000188

Gnomad4 NFE exome AF: 0.00130

Gnomad4 OTH exome AF: 0.00124

GnomAD4 genome AF: 0.000873 AC: 133 AN: 152334 Hom.: 0 Cov.: 32 AF XY: 0.000806 AC XY: 60 AN XY: 74486

Gnomad4 AFR AF: 0.000553

Gnomad4 AMR AF: 0.00137

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00126

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00128 Hom.: 1

Bravo AF: 0.00106

TwinsUK AF: 0.00162 AC: 6

ALSPAC AF: 0.00104 AC: 4

ESP6500AA AF: 0.000454 AC: 2

ESP6500EA AF: 0.00163 AC: 14

ExAC AF: 0.000923 AC: 112

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: no assertion criteria provided

Submissions by phenotype

UGT1A9-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jul 01, 2024

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.085
BayesDel_addAF	Benign	-0.57	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	0.85
DANN	Benign	0.34
DEOGEN2	Benign	0.18	T
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.030	N
LIST_S2	Benign	0.27	T
M_CAP	Benign	0.0077	T
MetaRNN	Benign	0.0059	T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.2	L
MutationTaster	Benign	1.0	N;N;N;N
PROVEAN	Benign	-0.14	N
REVEL	Benign	0.034
Sift	Benign	0.64	T
Sift4G	Benign	0.28	T
Polyphen		0.0040	B
Vest4		0.21
MVP		0.37
MPC		0.077
ClinPred		0.0012	T
GERP RS		2.6
Varity_R		0.035
gMVP		0.30

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: rs145084767; hg19: chr2-234580588;