chr2-233637304-A-G

Position:

• chr2-233637304-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_019075.4(UGT1A10):​c.782A>G​(p.Tyr261Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,658 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: 0.0000021 (0 hom.)
• Consequence: UGT1A10 NM_019075.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.259

Genes affected

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]

UGT1A (HGNC:12529):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
UGT1A10	NM_019075.4	c.782A>G	p.Tyr261Cys	missense_variant	1/5	ENST00000344644.10	NP_061948.1
UGT1A8	NM_019076.5	c.855+18742A>G		intron_variant		ENST00000373450.5	NP_061949.3
UGT1A		n.233637304A>G		intragenic_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
UGT1A10	ENST00000344644.10	c.782A>G	p.Tyr261Cys	missense_variant	1/5	1	NM_019075.4	ENSP00000343838.5
UGT1A10	ENST00000373445.1	c.782A>G	p.Tyr261Cys	missense_variant	1/5	1		ENSP00000362544.1
UGT1A8	ENST00000373450.5	c.855+18742A>G		intron_variant		1	NM_019076.5	ENSP00000362549.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461658 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 727138

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: 0.00000180

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 09, 2021

The c.782A>G (p.Y261C) alteration is located in exon 1 (coding exon 1) of the UGT1A10 gene. This alteration results from a A to G substitution at nucleotide position 782, causing the tyrosine (Y) at amino acid position 261 to be replaced by a cysteine (C). 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	Uncertain	0.53
BayesDel_addAF	Benign	-0.045	T
BayesDel_noAF	Benign	-0.30
CADD	Benign	16
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.66	D;.
Eigen	Benign	-0.35
Eigen_PC	Benign	-0.55
FATHMM_MKL	Benign	0.11	N
LIST_S2	Uncertain	0.93	D;D
M_CAP	Benign	0.010	T
MetaRNN	Uncertain	0.70	D;D
MetaSVM	Benign	-0.53	T
MutationAssessor	Pathogenic	2.9	M;M
PROVEAN	Pathogenic	-7.1	D;D
REVEL	Benign	0.23
Sift	Uncertain	0.0010	D;D
Sift4G	Uncertain	0.0020	D;D
Polyphen		0.96	D;.
Vest4		0.40
MutPred		0.73		Gain of loop (P = 0.0312);Gain of loop (P = 0.0312);
MVP		0.59
MPC		0.15
ClinPred		0.97	D
GERP RS		0.57
Varity_R		0.28
gMVP		0.40

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-234545950; COSMIC: COSV60851855;