rs142814307

Positions:

chr15-45364802-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2_SupportingPS3_Supporting

This summary comes from the ClinGen Evidence Repository: The NM_001482.3:c.1037C>T variant in GATM is a missense variant predicted to cause substitution of proline by leucine at amino acid 346 (p.Pro346Leu). To our knowledge, this variant has not been reported in the literature in any individuals with AGAT deficiency. The highest population minor allele frequency in gnomAD v2.1.1 is 0.000009 (1/113704 alleles) in the non-Finnish European population, which is lower than the ClinGen LSD VCEP’s threshold for PM2_Supporting (<0.000055), meeting this criterion (PM2_Supporting). Expression of the variant in HeLa cells resulted in <10% wild type AGAT activity indicating that this variant may impact protein function (PMID 27233232)(PS3_Supporting). The computational predictor REVEL gives a score of 0.237 which is neither above nor below the thresholds predicting a damaging (>0.75) or benign (<0.15) impact on AGAT function. In summary, this variant meets the criteria to be classified as uncertain significance for AGAT deficiency based on the ACMG/AMP criteria applied, as specified by the ClinGen Cerebral Creatine Deficiency Syndromes Variant Curation Expert Panel (Specifications Version 1.1.0): PM2_Supporting, PS3_Supporting.(Classification approved by the ClinGen CCDS VCEP on January 24, 2023). LINK:https://erepo.genome.network/evrepo/ui/classification/CA270166553/MONDO:0012996/025

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

GATM
ENST00000396659.8 missense

Scores

Clinical Significance

Uncertain significance reviewed by expert panel U:2O:1

Conservation

PhyloP100: 8.33

Variant links:

Genes affected

GATM (HGNC:4175): (glycine amidinotransferase) This gene encodes a mitochondrial enzyme that belongs to the amidinotransferase family. This enzyme is involved in creatine biosynthesis, whereby it catalyzes the transfer of a guanido group from L-arginine to glycine, resulting in guanidinoacetic acid, the immediate precursor of creatine. Mutations in this gene cause arginine:glycine amidinotransferase deficiency, an inborn error of creatine synthesis characterized by cognitive disability, language impairment, and behavioral disorders. [provided by RefSeq, Jul 2008]

GATM links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PS3

For more information check the summary or visit ClinGen Evidence Repository.

PM2

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GATM	NM_001482.3 linkuse as main transcript	c.1037C>T	p.Pro346Leu	missense_variant	7/9	ENST00000396659.8	NP_001473.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GATM	ENST00000396659.8 linkuse as main transcript	c.1037C>T	p.Pro346Leu	missense_variant	7/9	1	NM_001482.3	ENSP00000379895	P1	P50440-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152092

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:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251396

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135872

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 SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1460414

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726626

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152092

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74296

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000468

Hom.:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2Other:1

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Arginine:glycine amidinotransferase deficiency

Uncertain:2

Uncertain significance, reviewed by expert panel	curation	ClinGen Cerebral Creatine Deficiency Syndromes Variant Curation Expert Panel, ClinGen	Jan 24, 2023	The NM_001482.3:c.1037C>T variant in GATM is a missense variant predicted to cause substitution of proline by leucine at amino acid 346 (p.Pro346Leu). To our knowledge, this variant has not been reported in the literature in any individuals with AGAT deficiency. The highest population minor allele frequency in gnomAD v2.1.1 is 0.000009 (1/113704 alleles) in the non-Finnish European population, which is lower than the ClinGen LSD VCEP’s threshold for PM2_Supporting (<0.000055), meeting this criterion (PM2_Supporting). Expression of the variant in HeLa cells resulted in <10% wild type AGAT activity indicating that this variant may impact protein function (PMID 27233232)(PS3_Supporting). The computational predictor REVEL gives a score of 0.237 which is neither above nor below the thresholds predicting a damaging (>0.75) or benign (<0.15) impact on AGAT function. In summary, this variant meets the criteria to be classified as uncertain significance for AGAT deficiency based on the ACMG/AMP criteria applied, as specified by the ClinGen Cerebral Creatine Deficiency Syndromes Variant Curation Expert Panel (Specifications Version 1.1.0): PM2_Supporting, PS3_Supporting. (Classification approved by the ClinGen CCDS VCEP on January 24, 2023). -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Aug 31, 2022	This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 346 of the GATM protein (p.Pro346Leu). This variant is present in population databases (rs142814307, gnomAD 0.0009%). This variant has not been reported in the literature in individuals affected with GATM-related conditions. ClinVar contains an entry for this variant (Variation ID: 225920). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). Experimental studies have shown that this missense change affects GATM function (PMID: 27233232). 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. -

not provided

Other:1

not provided, no classification provided

in vitro

Hospital for Sick Children

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.33

BayesDel_addAF

Uncertain

0.036

BayesDel_noAF

Benign

-0.19

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.84

D;.

Eigen

Uncertain

0.55

Eigen_PC

Uncertain

0.59

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

D;D

M_CAP

Benign

0.026

MetaRNN

Pathogenic

0.78

D;D

MetaSVM

Benign

-0.86

MutationAssessor

Uncertain

2.3

M;M

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.67

PROVEAN

Uncertain

-3.7

D;D

REVEL

Benign

0.24

Sift

Benign

0.044

D;D

Sift4G

Benign

0.18

T;T

Polyphen

0.95

P;P

Vest4

0.78

MVP

0.24

MPC

0.81

ClinPred

0.96

GERP RS

5.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.49

gMVP

0.85

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over