NM_000156.6(GAMT):c.60G>A (p.Trp20Ter) AND Cerebral creatine deficiency syndrome

Germline classification:: Pathogenic (1 submission)
Last evaluated:: Dec 25, 2021
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:: RCV002947953.3

Allele description [Variation Report for NM_000156.6(GAMT):c.60G>A (p.Trp20Ter)]

NM_000156.6(GAMT):c.60G>A (p.Trp20Ter)

Genes:

LOC130062945:ATAC-STARR-seq lymphoblastoid silent region 9707 [Gene]
GAMT:guanidinoacetate N-methyltransferase [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

19p13.3

Genomic location:

Preferred name:

NM_000156.6(GAMT):c.60G>A (p.Trp20Ter)

HGVS:

NC_000019.10:g.1401417C>T
NG_009785.1:g.5137G>A
NM_000156.4:c.60G>A
NM_000156.6:c.60G>AMANE SELECT
NM_138924.3:c.60G>A
NP_000147.1:p.Trp20Ter
NP_620279.1:p.Trp20Ter
NC_000019.9:g.1401416C>T

Protein change:

W20*

Molecular consequence:

NM_000156.6:c.60G>A - nonsense - [Sequence Ontology: SO:0001587]
NM_138924.3:c.60G>A - nonsense - [Sequence Ontology: SO:0001587]

Condition(s)

Name:: Cerebral creatine deficiency syndrome (CCAD)
Synonyms:: Creatine deficiency syndromes
Identifiers:: MONDO: MONDO:0000456; MedGen: C5244016; Orphanet: 79172; OMIM: PS300352

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV003269253	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Pathogenic (Dec 25, 2021)	germline	clinical testing	PubMed (2) [See all records that cite these PMIDs] 15108290, 28492532

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV003269253

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Pathogenic
(Dec 25, 2021)

germline

clinical testing

PubMed (2)
[See all records that cite these PMIDs]

Help

Summary from all submissions

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

Citations

PubMed

Characterization of seven novel mutations in seven patients with GAMT deficiency.

Item CB, Mercimek-Mahmutoglu S, Battini R, Edlinger-Horvat C, Stromberger C, Bodamer O, Mühl A, Vilaseca MA, Korall H, Stöckler-Ipsiroglu S.

Hum Mutat. 2004 May;23(5):524.

PubMed [citation]

PMID:: 15108290

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 Labcorp Genetics (formerly Invitae), Labcorp, SCV003269253.2

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (2)

Description

For these reasons, this variant has been classified as Pathogenic. This variant has not been reported in the literature in individuals affected with GAMT-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Trp20*) in the GAMT gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in GAMT are known to be pathogenic (PMID: 15108290).

#	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

Last Updated: Sep 29, 2024

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