NM_144639.3:c.2026C>T

Variant names:

• chr3-126482350-G-A
• rs757795630
• NM_144639.3:c.2026C>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_144639.3(UROC1):​c.2026C>T​(p.Leu676Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000411 in 1,460,658 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: UROC1 NM_144639.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0850
• Publications: 0 publications found

Genes affected

UROC1 (HGNC:26444): (urocanate hydratase 1) This gene encodes an enzyme involved in the second step of histidine catabolism, metabolizing urocanic acid to formiminoglutamic acid. Deficiency of this enzyme results in urocanic aciduria, and is an apparent cause of mental retardation. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2021]

UROC1 Gene-Disease associations (from GenCC):

• urocanic aciduria

  Inheritance: AR Classification: DEFINITIVE, MODERATE, SUPPORTIVE, LIMITED Submitted by: G2P, ClinGen, Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.05471489).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_144639.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	UROC1	NM_144639.3	MANE Select	c.2026C>T	p.Leu676Phe	missense	Exon 20 of 20	NP_653240.1	Q96N76-1
	UROC1	NM_001165974.2		c.2206C>T	p.Leu736Phe	missense	Exon 21 of 21	NP_001159446.1	Q96N76-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	UROC1	ENST00000290868.7	TSL:1 MANE Select	c.2026C>T	p.Leu676Phe	missense	Exon 20 of 20	ENSP00000290868.2	Q96N76-1
	UROC1	ENST00000383579.3	TSL:1	c.2206C>T	p.Leu736Phe	missense	Exon 21 of 21	ENSP00000373073.3	Q96N76-2
	UROC1	ENST00000875183.1		c.2098C>T	p.Leu700Phe	missense	Exon 21 of 21	ENSP00000545242.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000403 AC: 1 AN: 248354 AF XY: 0.00

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000895

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000411 AC: 6 AN: 1460658 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 726600

African (AFR) AF: 0.00 AC: 0 AN: 33462

American (AMR) AF: 0.00 AC: 0 AN: 44694

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26126

East Asian (EAS) AF: 0.00 AC: 0 AN: 39692

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86210

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53022

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5392

European-Non Finnish (NFE) AF: 0.00000450 AC: 5 AN: 1111748

Other (OTH) AF: 0.00 AC: 0 AN: 60312

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ExAC AF: 0.00000824 AC: 1

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.081
BayesDel_addAF	Benign	-0.24	T
BayesDel_noAF	Benign	-0.58
CADD	Benign	16
DANN	Uncertain	1.0
DEOGEN2	Benign	0.026	T
Eigen	Benign	-0.82
Eigen_PC	Benign	-0.81
FATHMM_MKL	Benign	0.081	N
LIST_S2	Benign	0.55	T
M_CAP	Benign	0.024	T
MetaRNN	Benign	0.055	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.90	L
PhyloP100		0.085
PrimateAI	Benign	0.31	T
PROVEAN	Benign	-0.33	N
REVEL	Benign	0.025
Sift	Uncertain	0.0040	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.12	B
Vest4		0.053
MutPred		0.42		Gain of catalytic residue at L676 (P = 0.0485)
MVP		0.20
MPC		0.41
ClinPred		0.53	D
GERP RS		0.060
Varity_R		0.076
gMVP		0.41
Mutation Taster		=98/2	polymorphism

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

Other links and lift over

dbSNP: rs757795630; hg19: chr3-126201193;