NM_000156.6(GAMT):c.25A>G (p.Ile9Val) AND Deficiency of guanidinoacetate methyltransferase

Germline classification:: Uncertain significance (3 submissions)
Last evaluated:: Oct 24, 2019
Review status:: 2 stars out of maximum of 4 stars
criteria provided, multiple submitters, no conflicts

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:: RCV001127427.14

Allele description [Variation Report for NM_000156.6(GAMT):c.25A>G (p.Ile9Val)]

NM_000156.6(GAMT):c.25A>G (p.Ile9Val)

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.25A>G (p.Ile9Val)

HGVS:

NC_000019.10:g.1401452T>C
NG_009785.1:g.5102A>G
NM_000156.6:c.25A>GMANE SELECT
NM_138924.3:c.25A>G
NP_000147.1:p.Ile9Val
NP_620279.1:p.Ile9Val
NC_000019.9:g.1401451T>C
NM_000156.4:c.25A>G
NM_000156.5:c.25A>G

Protein change:

I9V

Links:

dbSNP: rs1555777381

NCBI 1000 Genomes Browser:

rs1555777381

Molecular consequence:

NM_000156.6:c.25A>G - missense variant - [Sequence Ontology: SO:0001583]
NM_138924.3:c.25A>G - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Deficiency of guanidinoacetate methyltransferase (CCDS2)
Synonyms:: CEREBRAL CREATINE DEFICIENCY SYNDROME 2
Identifiers:: MONDO: MONDO:0012999; MedGen: C0574080; Orphanet: 382; OMIM: 612736

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV001286739	Illumina Laboratory Services, Illumina	criteria provided, single submitter (ICSL Variant Classification Criteria 13 December 2019)	Uncertain significance (Jan 13, 2018)	germline	clinical testing	Citation Link,
SCV001520374	Baylor Genetics	criteria provided, single submitter (ACMG Guidelines, 2015)	Uncertain significance (Oct 24, 2019)	unknown	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV002087065	Natera, Inc.	no assertion criteria provided	Uncertain significance (Jul 17, 2020)	germline	clinical testing

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV001286739

Illumina Laboratory Services, Illumina

criteria provided, single submitter

(ICSL Variant Classification Criteria 13 December 2019)

Uncertain significance
(Jan 13, 2018)

germline

clinical testing

Citation Link,

SCV001520374

Baylor Genetics

criteria provided, single submitter

(ACMG Guidelines, 2015)

Uncertain significance
(Oct 24, 2019)

unknown

clinical testing

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

SCV002087065

Natera, Inc.

no assertion criteria provided

Uncertain significance
(Jul 17, 2020)

germline

clinical testing

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
not provided	unknown	yes	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology.

Richards S, Aziz N, Bale S, Bick D, Das S, Gastier-Foster J, Grody WW, Hegde M, Lyon E, Spector E, Voelkerding K, Rehm HL; ACMG Laboratory Quality Assurance Committee..

Genet Med. 2015 May;17(5):405-24. doi: 10.1038/gim.2015.30. Epub 2015 Mar 5.

PubMed [citation]

PMID:: 25741868
PMCID:: PMC4544753

Details of each submission

From Illumina Laboratory Services, Illumina, SCV001286739.1

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

Description

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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.

#	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 Baylor Genetics, SCV001520374.1

#	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 determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868].

#	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., SCV002087065.1

#	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

Last Updated: Nov 3, 2024

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