3-49422223-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM2PM5PP3_StrongPP5

The NM_000481.4(AMT):c.139G>A(p.Gly47Arg) variant causes a missense change. The variant allele was found at a frequency of 0.0000322 in 1,613,976 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G47W) has been classified as Likely pathogenic.

Frequency

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

Exomes 𝑓: 0.000035 ( 0 hom. )

Consequence

AMT
NM_000481.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3U:1

Conservation

PhyloP100: 5.18

Variant links:

Genes affected

AMT (HGNC:473): (aminomethyltransferase) This gene encodes one of four critical components of the glycine cleavage system. Mutations in this gene have been associated with glycine encephalopathy. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2011]

AMT links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr3-49422223-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 56226.Status of the report is no_assertion_criteria_provided, 0 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.983

PP5

Variant 3-49422223-C-T is Pathogenic according to our data. Variant chr3-49422223-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 11975.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Pathogenic=1, Uncertain_significance=1}. Variant chr3-49422223-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AMT	NM_000481.4 linkuse as main transcript	c.139G>A	p.Gly47Arg	missense_variant	2/9	ENST00000273588.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AMT	ENST00000273588.9 linkuse as main transcript	c.139G>A	p.Gly47Arg	missense_variant	2/9	1	NM_000481.4	P1	P48728-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152222

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:

0.0000477

AC:

AN:

251330

Hom.:

AF XY:

0.0000589

AC XY:

AN XY:

135864

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000867

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.0000616

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000349

AC:

AN:

1461754

Hom.:

Cov.:

AF XY:

0.0000316

AC XY:

AN XY:

727176

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000894

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000563

Gnomad4 NFE exome

AF:

0.0000360

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152222

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74362

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:

0.0000495

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.0000494

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Non-ketotic hyperglycinemia

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Nov 20, 2023	This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 47 of the AMT protein (p.Gly47Arg). This variant is present in population databases (rs121964982, gnomAD 0.009%). This missense change has been observed in individual(s) with glycine encephalopathy (PMID: 8005589, 27362913; Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 11975). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt AMT protein function with a positive predictive value of 95%. Experimental studies have shown that this missense change affects AMT function (PMID: 23352163). For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Aug 29, 2023	- -

Glycine encephalopathy 2

Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jun 01, 1994

- -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 04, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.91

BayesDel_addAF

Pathogenic

0.30

BayesDel_noAF

Pathogenic

0.38

Cadd

Pathogenic

Dann

Pathogenic

1.0

DEOGEN2

Pathogenic

0.83

D;T;.;.;T;T;.;T

Eigen

Uncertain

0.43

Eigen_PC

Uncertain

0.48

FATHMM_MKL

Uncertain

0.95

LIST_S2

Pathogenic

1.0

D;D;D;D;D;D;D;D

M_CAP

Pathogenic

0.37

MetaRNN

Pathogenic

0.98

D;D;D;D;D;D;D;D

MetaSVM

Benign

-0.30

MutationAssessor

Pathogenic

3.4

M;.;M;M;.;.;.;.

MutationTaster

Benign

1.0

A;A;A;A;A

PrimateAI

Uncertain

0.73

PROVEAN

Pathogenic

-6.3

D;.;D;D;.;.;.;.

REVEL

Pathogenic

0.88

Sift

Pathogenic

0.0

D;.;D;D;.;.;.;.

Sift4G

Uncertain

0.024

D;.;D;D;.;.;.;.

Polyphen

1.0

D;.;.;.;.;.;.;.

Vest4

0.97

MutPred

0.96

Gain of methylation at G47 (P = 0.031);Gain of methylation at G47 (P = 0.031);Gain of methylation at G47 (P = 0.031);Gain of methylation at G47 (P = 0.031);Gain of methylation at G47 (P = 0.031);Gain of methylation at G47 (P = 0.031);Gain of methylation at G47 (P = 0.031);Gain of methylation at G47 (P = 0.031);

MVP

0.88

MPC

0.75

ClinPred

0.63

GERP RS

5.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.97

gMVP

0.93

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.41

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.41

Position offset: -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