Genetic Variant OTC:c.216+9C>T (chrX-38367438-C-T) – ACMG Classification: Benign (-20 pts)

Variant summary

Our verdict is Benign. The variant received -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

Publications

0 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: Benign. The variant received -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 VariationId 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. GnomAdExome4 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 GnomAdExome4. There are 11 alleles in the male GnomAdExome4 subpopulation. Median coverage is 27. This position passed quality control check.

BS2

High Hemizygotes in GnomAdExome4 at 11 XL gene

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.216+9C>T		intron	N/A	NP_000522.3
	OTC	NM_001407092.1		c.216+9C>T		intron	N/A	NP_001394021.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
OTC	ENST00000039007.5	TSL:1 MANE Select	c.216+9C>T	intron	N/A	ENSP00000039007.4
ENSG00000250349	ENST00000465127.1	TSL:5	c.172-298683C>T	intron	N/A	ENSP00000417050.1
OTC	ENST00000713758.1		c.216+9C>T	intron	N/A	ENSP00000519059.1

Frequencies

GnomAD3 genomes

AF:

0.0000180

AC:

AN:

110920

Hom.:

Cov.:

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

GnomAD2 exomes

AF:

0.0000165

AC:

AN:

182280

AF XY:

0.0000298

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 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

African (AFR)

AF:

0.00

AC:

AN:

26102

American (AMR)

AF:

0.00

AC:

AN:

35065

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19204

East Asian (EAS)

AF:

0.00

AC:

AN:

30015

South Asian (SAS)

AF:

0.00

AC:

AN:

53686

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40306

Middle Eastern (MID)

AF:

0.00221

AC:

AN:

4074

European-Non Finnish (NFE)

AF:

0.0000193

AC:

AN:

829357

Other (OTH)

AF:

0.0000659

AC:

AN:

45495

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.446

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000180

AC:

AN:

110920

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

33164

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30503

American (AMR)

AF:

0.00

AC:

AN:

10391

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2639

East Asian (EAS)

AF:

0.00

AC:

AN:

3515

South Asian (SAS)

AF:

0.00

AC:

AN:

2627

European-Finnish (FIN)

AF:

0.00

AC:

AN:

5809

Middle Eastern (MID)

AF:

0.00426

AC:

AN:

235

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

53018

Other (OTH)

AF:

0.000667

AC:

AN:

1499

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000389

Hom.:

Bravo

AF:

0.0000113

ClinVar

ClinVar submissions as Germline

Significance:Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

Ornithine carbamoyltransferase deficiency (3)

not provided (2)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.81

CADD

Benign

3.7

(source)

DANN

Benign

0.61

PhyloP100

-0.075

Mutation Taster

=100/0

polymorphism

(source)

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

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

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over