10-125816708-C-T

Position:

• chr10-125816708-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2 PP5_Moderate BP4

The NM_000375.3(UROS):​c.-26-183G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000841 in 475,390 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 Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000084 (0 hom.)
• Consequence: UROS NM_000375.3 intron
• Clinical Significance: Pathogenic criteria provided, single submitter P:3
• Conservation: PhyloP100: 0.198

Genes affected

UROS (HGNC:12592): (uroporphyrinogen III synthase) The protein encoded by this gene catalyzes the fourth step of porphyrin biosynthesis in the heme biosynthetic pathway. Defects in this gene cause congenital erythropoietic porphyria (Gunther's disease). [provided by RefSeq, Jul 2008]

UROS (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 10-125816708-C-T is Pathogenic according to our data. Variant chr10-125816708-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 3763.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.25). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
UROS	NM_000375.3	c.-26-183G>A		intron_variant		ENST00000368797.10	NP_000366.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
UROS	ENST00000368797.10	c.-26-183G>A		intron_variant		1	NM_000375.3	ENSP00000357787.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000841 AC: 4 AN: 475390 Hom.: 0 AF XY: 0.0000119 AC XY: 3 AN XY: 252252

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: 0.0000139

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, single submitter

Submissions by phenotype

Cutaneous porphyria Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Mar 01, 2001	- -
Pathogenic, no assertion criteria provided	literature only	GeneReviews	Apr 07, 2016	- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 02, 2023

This sequence change falls in intron 1 of the UROS gene. It does not directly change the encoded amino acid sequence of the UROS protein. This variant is not present in population databases (gnomAD no frequency). This variant has been observed in individuals with congenital erythropoietic porphyria (PMID: 11254675, 16365260, 27859603). It has also been observed to segregate with disease in related individuals. This variant is also known as -76G>A or 1-209G>A. ClinVar contains an entry for this variant (Variation ID: 3763). Algorithms developed to predict the effect of variants on protein structure and function are not available or were not evaluated for this variant. Experimental studies have shown that this variant affects UROS function (PMID: 27859603). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.25
CADD	Benign	15
DANN	Benign	0.85

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: rs397515349; hg19: chr10-127505277;