rs774764719

Positions:

chrX-38367438-C-T

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_000531.6(OTC):c.216+9C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000251 in 1,194,224 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 11 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.000018 ( 0 hom., 0 hem., cov: 22)

Exomes 𝑓: 0.000026 ( 0 hom. 11 hem. )

Consequence

OTC
NM_000531.6 intron

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts U:1B:4

Conservation

PhyloP100: -0.0750

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.81).

BP6

Variant X-38367438-C-T is Benign according to our data. Variant chrX-38367438-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 368258.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.0000258 (28/1083304) while in subpopulation MID AF= 0.00221 (9/4074). AF 95% confidence interval is 0.00115. There are 0 homozygotes in gnomad4_exome. There are 11 alleles in male gnomad4_exome subpopulation. Median coverage is 27. This position pass quality control queck.

BS2

High Hemizygotes in GnomAdExome4 at 11 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	MANE	Protein
OTC	NM_000531.6 linkuse as main transcript	c.216+9C>T	intron_variant	ENST00000039007.5	NP_000522.3
OTC	NM_001407092.1 linkuse as main transcript	c.216+9C>T	intron_variant		NP_001394021.1
OTC	XM_017029556.2 linkuse as main transcript	c.216+9C>T	intron_variant		XP_016885045.1

Ensembl

Gene	Transcript	HGVSc	Effect	TSL	MANE	Protein	Appris
OTC	ENST00000039007.5 linkuse as main transcript	c.216+9C>T	intron_variant	1	NM_000531.6	ENSP00000039007	P1
OTC	ENST00000643344.1 linkuse as main transcript	c.216+9C>T	intron_variant, NMD_transcript_variant			ENSP00000496606
OTC	ENST00000488812.1 linkuse as main transcript	n.308+9C>T	intron_variant, non_coding_transcript_variant	5

Frequencies

GnomAD3 genomes

AF:

0.0000180

AC:

AN:

110920

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

33164

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00426

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000667

GnomAD3 exomes

AF:

0.0000165

AC:

AN:

182280

Hom.:

AF XY:

0.0000298

AC XY:

AN XY:

67068

show subpopulations

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 SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000246

Gnomad OTH exome

AF:

0.000223

GnomAD4 exome

AF:

0.0000258

AC:

AN:

1083304

Hom.:

Cov.:

AF XY:

0.0000315

AC XY:

AN XY:

349532

show subpopulations

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:

0.0000193

Gnomad4 OTH exome

AF:

0.0000659

GnomAD4 genome

AF:

0.0000180

AC:

AN:

110920

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

33164

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000667

Bravo

AF:

0.0000113

ClinVar

Significance: Likely benign

Submissions summary: Uncertain:1Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Ornithine carbamoyltransferase deficiency

Uncertain:1Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -
Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Jan 04, 2020	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 09, 2024	- -

not provided

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Apr 12, 2018	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.81

CADD

Benign

3.7

DANN

Benign

0.61

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over