Genetic Variant GAMT:p.Thr123Ser (chr19-1399548-T-A) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_138924.3(GAMT):c.367A>T(p.Thr123Ser) variant causes a missense change. The variant allele was found at a frequency of 0.000000685 in 1,460,822 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T123A) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

GAMT
NM_138924.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 4.92

Publications

1 publications found

Variant links:

Genes affected

GAMT (HGNC:4136): (guanidinoacetate N-methyltransferase) The protein encoded by this gene is a methyltransferase that converts guanidoacetate to creatine, using S-adenosylmethionine as the methyl donor. Defects in this gene have been implicated in neurologic syndromes and muscular hypotonia, probably due to creatine deficiency and accumulation of guanidinoacetate in the brain of affected individuals. Two transcript variants encoding different isoforms have been described for this gene. Pseudogenes of this gene are found on chromosomes 2 and 13. [provided by RefSeq, Feb 2012]

GAMT Gene-Disease associations (from GenCC):

guanidinoacetate methyltransferase deficiency
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae), ClinGen, Ambry Genetics

GAMT links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.3038543).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_138924.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GAMT	NM_000156.6	MANE Select	c.367A>T	p.Thr123Ser	missense	Exon 3 of 6	NP_000147.1
	GAMT	NM_138924.3		c.367A>T	p.Thr123Ser	missense	Exon 3 of 5	NP_620279.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
GAMT	ENST00000252288.8	TSL:1 MANE Select	c.367A>T	p.Thr123Ser	missense	Exon 3 of 6	ENSP00000252288.1
GAMT	ENST00000902474.1		c.637A>T	p.Thr213Ser	missense	Exon 3 of 6	ENSP00000572533.1
GAMT	ENST00000447102.8	TSL:2	c.367A>T	p.Thr123Ser	missense	Exon 3 of 5	ENSP00000403536.2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000402

AC:

AN:

248736

AF XY:

0.00000741

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000891

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460822

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726610

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33474

American (AMR)

AF:

0.00

AC:

AN:

44668

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26112

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86108

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52862

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111774

Other (OTH)

AF:

0.00

AC:

AN:

60362

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.077

BayesDel_addAF

Uncertain

0.040

BayesDel_noAF

Benign

-0.18

CADD

Benign

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.35

Eigen

Benign

-0.27

Eigen_PC

Benign

-0.15

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Benign

0.78

M_CAP

Uncertain

0.16

MetaRNN

Benign

0.30

MetaSVM

Benign

-0.44

MutationAssessor

Benign

1.9

PhyloP100

4.9

PrimateAI

Benign

0.44

PROVEAN

Benign

-0.96

REVEL

Uncertain

0.39

Sift

Benign

0.54

Sift4G

Benign

0.61

Polyphen

0.12

Vest4

0.57

MutPred

0.28

Gain of disorder (P = 0.0618)

MVP

0.85

MPC

0.13

ClinPred

0.28

GERP RS

3.8

PromoterAI

0.010

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.56

gMVP

0.49

Mutation Taster

=57/43

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over