Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM1PM2PM5PP2PP3_Strong

The NM_000531.6(OTC):c.377A>G(p.Asp126Gly) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D126E) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 23)

Exomes 𝑓: 0.0 ( 0 hom. 0 hem. )

Failed GnomAD Quality Control

Consequence

OTC
NM_000531.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter P:1U:1

Conservation

PhyloP100: 6.86

Publications

6 publications found

Variant links:

Genes affected

OTC (HGNC:8512): (ornithine transcarbamylase) This nuclear gene encodes a mitochondrial matrix enzyme. The encoded protein is involved in the urea cycle which functions to detoxify ammonia into urea for excretion. Mutations in this enzyme lead to ornithine transcarbamylase deficiency, which causes hyperammonemia. [provided by RefSeq, May 2022]

OTC Gene-Disease associations (from GenCC):

ornithine carbamoyltransferase deficiency
Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, G2P, Laboratory for Molecular Medicine, Orphanet

OTC links:

ENSG00000250349 (HGNC:):

ENSG00000250349 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 11 ACMG points.

PM1

In a hotspot region, there are 8 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 12 uncertain in NM_000531.6

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chrX-38381421-C-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 3617384.

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 266 curated pathogenic missense variants (we use a threshold of 10). The gene has 15 curated benign missense variants. Gene score misZ: 1.3274 (below the threshold of 3.09). Trascript score misZ: NaN (below the threshold of 3.09). GenCC associations: The gene is linked to ornithine carbamoyltransferase deficiency.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.996

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000531.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OTC	NM_000531.6	MANE Select	c.377A>G	p.Asp126Gly	missense	Exon 4 of 10	NP_000522.3
	OTC	NM_001407092.1		c.377A>G	p.Asp126Gly	missense	Exon 6 of 12	NP_001394021.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
OTC	ENST00000039007.5	TSL:1 MANE Select	c.377A>G	p.Asp126Gly	missense	Exon 4 of 10	ENSP00000039007.4
ENSG00000250349	ENST00000465127.1	TSL:5	c.172-284701A>G		intron	N/A	ENSP00000417050.1
OTC	ENST00000713758.1		c.377A>G	p.Asp126Gly	missense	Exon 6 of 12	ENSP00000519059.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

1064544

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

332866

African (AFR)

AF:

0.00

AC:

AN:

25791

American (AMR)

AF:

0.00

AC:

AN:

35150

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19169

East Asian (EAS)

AF:

0.00

AC:

AN:

30084

South Asian (SAS)

AF:

0.00

AC:

AN:

53286

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40475

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4043

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

811525

Other (OTH)

AF:

0.00

AC:

AN:

45021

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

ClinVar

ClinVar submissions as Germline

Significance:Uncertain significance

Revision:criteria provided, single submitter

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (1)

Ornithine carbamoyltransferase deficiency (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.97

BayesDel_addAF

Pathogenic

0.72

BayesDel_noAF

Pathogenic

0.79

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.99

FATHMM_MKL

Uncertain

0.97

LIST_S2

Pathogenic

1.0

M_CAP

Pathogenic

0.98

MetaRNN

Pathogenic

1.0

MetaSVM

Pathogenic

0.96

MutationAssessor

Pathogenic

3.6

PhyloP100

6.9

PrimateAI

Uncertain

0.67

PROVEAN

Pathogenic

-6.6

REVEL

Pathogenic

0.98

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.99

MutPred

0.99

Gain of methylation at R129 (P = 0.0803)

MVP

1.0

MPC

1.1

ClinPred

1.0

GERP RS

5.9

Varity_R

0.99

gMVP

0.99

Mutation Taster

=1/99

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

Splicevardb

2.0

SpliceAI score (max)

0.17

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

rs72554358

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over