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NM_153006.3(NAGS):c.115G>A (p.Ala39Thr) AND Hyperammonemia, type III

Germline classification:
Uncertain significance (1 submission)
Last evaluated:
Aug 8, 2022
Review status:
1 star out of maximum of 4 stars
criteria provided, single submitter
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:
RCV002988623.1

Allele description

NM_153006.3(NAGS):c.115G>A (p.Ala39Thr)

Gene:
NAGS:N-acetylglutamate synthase [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
17q21.31
Genomic location:
Preferred name:
NM_153006.3(NAGS):c.115G>A (p.Ala39Thr)
HGVS:
  • NC_000017.11:g.44004778G>A
  • NG_008106.1:g.5115G>A
  • NG_023338.1:g.4692C>T
  • NG_023338.2:g.4667C>T
  • NM_153006.3:c.115G>AMANE SELECT
  • NP_694551.1:p.Ala39Thr
  • NC_000017.10:g.42082146G>A
Protein change:
A39T
Molecular consequence:
  • NM_153006.3:c.115G>A - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:
Hyperammonemia, type III (NAGSD)
Synonyms:
NAG synthetase deficiency; Hyperammonemia due to N-acetylglutamate synthase deficiency
Identifiers:
MONDO: MONDO:0009377; MedGen: C0268543; Orphanet: 927; OMIM: 237310

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Assertion and evidence details

Help
Submission AccessionSubmitterReview Status
(Assertion method)		Clinical Significance
(Last evaluated)		OriginMethodCitations
SCV003291787Invitae
criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))		Uncertain significance
(Aug 8, 2022) 		germlineclinical testing

PubMed (1)
[See all records that cite this PMID]

Help

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineunknownnot providednot providednot providednot providednot providedclinical 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. doi: 10.1038/s41436-019-0624-9.

PubMed [citation]
PMID:
28492532
PMCID:
PMC5632818

Details of each submission

From Invitae, SCV003291787.1

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testing PubMed (1)

Description

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 39 of the NAGS protein (p.Ala39Thr). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with NAGS-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The threonine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

#SampleMethodObservation
OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1germlineunknownnot providednot providednot providednot providednot providednot providednot provided

Last Updated: Feb 13, 2023