NM_000531.6(OTC):c.540+265G>A AND Ornithine carbamoyltransferase deficiency

Germline classification:: Conflicting interpretations of pathogenicity (8 submissions)
Last evaluated:: Mar 25, 2024
Review status:: criteria provided, conflicting classifications

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV000548908.14

Allele description [Variation Report for NM_000531.6(OTC):c.540+265G>A]

NM_000531.6(OTC):c.540+265G>A

Gene:

OTC:ornithine transcarbamylase [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

Xp11.4

Genomic location:

Preferred name:

NM_000531.6(OTC):c.540+265G>A

HGVS:

NC_000023.11:g.38401693G>A
NG_008471.1:g.54211G>A
NM_000531.6:c.540+265G>AMANE SELECT
LRG_846t1:c.540+265G>A
LRG_846:g.54211G>A
NC_000023.10:g.38260946G>A
NM_000531.5:c.540+265G>A

Links:

dbSNP: rs1555975756

NCBI 1000 Genomes Browser:

rs1555975756

Molecular consequence:

NM_000531.6:c.540+265G>A - intron variant - [Sequence Ontology: SO:0001627]

Observations:

Condition(s)

Name:: Ornithine carbamoyltransferase deficiency (OTCD)
Synonyms:: ORNITHINE TRANSCARBAMYLASE DEFICIENCY, HYPERAMMONEMIA DUE TO; Ornithine transcarbamylase deficiency; OTC deficiency; See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0010703; MedGen: C0268542; Orphanet: 664; OMIM: 311250

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000631860	Invitae	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Pathogenic (Sep 21, 2022)	germline	clinical testing	PubMed (4) [See all records that cite these PMIDs] 18204299, 18440262, 33489762, 28492532
SCV001368080	Centre for Mendelian Genomics, University Medical Centre Ljubljana	criteria provided, single submitter (ACMG Guidelines, 2015)	Pathogenic (Jan 1, 2016)	unknown	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV001458517	Natera, Inc.	no assertion criteria provided	Pathogenic (Sep 16, 2020)	germline	clinical testing
SCV002517834	Mendelics	criteria provided, single submitter (Mendelics Assertion Criteria 2019)	Pathogenic (May 4, 2022)	germline	clinical testing	Citation Link,
SCV002581227	MGZ Medical Genetics Center	criteria provided, single submitter (ACMG Guidelines, 2015)	Pathogenic (Nov 9, 2021)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV004357050	Color Diagnostics, LLC DBA Color Health	criteria provided, single submitter (ACMG Guidelines, 2015)	Pathogenic (Mar 8, 2023)	germline	clinical testing	PubMed (5) [See all records that cite these PMIDs] 18204299, 18440262, 33489762, 34014569, 25741868
SCV004806270	Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center	criteria provided, single submitter (ACMG Guidelines, 2015)	Uncertain significance (Mar 25, 2024)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV004834032	All of Us Research Program, National Institutes of Health	criteria provided, single submitter (ACMG Guidelines, 2015)	Pathogenic (Jul 19, 2023)	germline	clinical testing	PubMed (5) [See all records that cite these PMIDs] 18204299, 18440262, 33489762, 34014569, 25741868

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Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	yes	1	not provided	not provided	not provided	not provided	clinical testing
not provided	unknown	yes	not provided	not provided	not provided	not provided	not provided	clinical testing
not provided	germline	unknown	1	not provided	not provided	108544	not provided	clinical testing

Citations

PubMed

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group., Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240-242.

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

Mutation analysis of the ornithine transcarbamylase (OTC) gene in five Japanese OTC deficiency patients revealed two known and three novel mutations including a deep intronic mutation.

Ogino W, Takeshima Y, Nishiyama A, Okizuka Y, Yagi M, Tsuneishi S, Saiki K, Kugo M, Matsuo M.

Kobe J Med Sci. 2007;53(5):229-40.

PubMed [citation]

PMID:: 18204299

See all PubMed Citations (6)

Details of each submission

From Invitae, SCV000631860.6

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (4)

Description

For these reasons, this variant has been classified as Pathogenic. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. ClinVar contains an entry for this variant (Variation ID: 449382). This variant has been observed in individual(s) with ornithine transcarbamylase (OTC) deficiency (PMID: 18204299, 18440262, 33489762). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the gnomAD database. This sequence change falls in intron 5 of the OTC gene. It does not directly change the encoded amino acid sequence of the OTC protein.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Centre for Mendelian Genomics, University Medical Centre Ljubljana, SCV001368080.2

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

Description

This variant was classified as: Pathogenic.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	unknown	yes	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Natera, Inc., SCV001458517.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Mendelics, SCV002517834.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From MGZ Medical Genetics Center, SCV002581227.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	1	not provided	not provided	clinical testing	PubMed (1)

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	yes	not provided	not provided	not provided		1	not provided	not provided	not provided

From Color Diagnostics, LLC DBA Color Health, SCV004357050.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (5)

Description

This variant causes a G to A nucleotide substitution at the +265 position of intron 5 of the OTC gene. This variant has been reported in three male neonates clinically diagnosed with OTC deficiency (PMID: 18204299, 18440262, 34014569), as well as in seven females affected with late-onset OTC deficiency (PMID: 33489762) and episodic OTC deficiency (PMID: 34014569). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). RT-PCR analyses of patient-derived RNA have shown that a new splice acceptor site created by this variant is paired with a cryptic splice donor site located 135 nucleotides downstream, resulting in the inclusion of the 135-nucleotide intronic sequence between exons 5 and 6 of the OTC transcript with a premature stop of translation at codon 184 (PMID: 18204299, 18440262). This variant is expected to result in an absent or nonfunctional protein product. Loss of OTC function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, SCV004806270.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From All of Us Research Program, National Institutes of Health, SCV004834032.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	1	not provided	not provided	clinical testing	PubMed (5)

Description

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	108544	not provided	not provided		1	not provided	not provided	not provided

Last Updated: Apr 20, 2024

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