Genetic Variant MTFMT:p.Ter390Tyrext*? (chr15-65003062-C-G) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PM4

The NM_139242.4(MTFMT):c.1170G>C(p.Ter390Tyrext*?) variant causes a stop lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000132 in 1,513,042 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

MTFMT
NM_139242.4 stop_lost

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.342

Variant links:

Genes affected

MTFMT (HGNC:29666): (mitochondrial methionyl-tRNA formyltransferase) The protein encoded by this nuclear gene localizes to the mitochondrion, where it catalyzes the formylation of methionyl-tRNA. [provided by RefSeq, Jun 2011]

MTFMT links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM4

Stoplost variant in NM_139242.4 Downstream stopcodon found after 9 codons.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MTFMT	NM_139242.4 link	c.1170G>C	p.Ter390Tyrext*?	stop_lost	Exon 9 of 9	ENST00000220058.9	NP_640335.2	Q96DP5-1
MTFMT	XM_005254158.6 link	c.1323G>C	p.Ter441Tyrext*?	stop_lost	Exon 9 of 9		XP_005254215.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MTFMT	ENST00000220058.9 link	c.1170G>C	p.Ter390Tyrext*?	stop_lost	Exon 9 of 9	1	NM_139242.4	ENSP00000220058.4	Q96DP5-1
MTFMT	ENST00000558460.5 link	n.1170G>C		non_coding_transcript_exon_variant	Exon 9 of 10	5		ENSP00000452646.1	Q96DP5-1
MTFMT	ENST00000560717.5 link	n.*640G>C		non_coding_transcript_exon_variant	Exon 8 of 8	5		ENSP00000457257.1	H3BTN9
MTFMT	ENST00000560717.5 link	n.*640G>C		3_prime_UTR_variant	Exon 8 of 8	5		ENSP00000457257.1	H3BTN9

Frequencies

GnomAD3 genomes

AF:

0.00000664

AC:

AN:

150566

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:

0.000209

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000228

AC:

AN:

219714

Hom.:

AF XY:

0.0000418

AC XY:

AN XY:

119612

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:

0.000207

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000139

AC:

AN:

1362476

Hom.:

Cov.:

AF XY:

0.0000193

AC XY:

AN XY:

672218

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:

0.000262

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000664

AC:

AN:

150566

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

73310

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:

0.000209

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.0000331

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Feb 11, 2025

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Stop codon loss and change to a tyrosine codon, leading to protein extension and the addition of 16 amino acid(s) at the C-terminus; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.60

BayesDel_noAF

Benign

-0.82

CADD

Benign

7.4

DANN

Benign

0.60

Eigen

Benign

0.18

Eigen_PC

Benign

-0.20

FATHMM_MKL

Benign

0.038

Vest4

0.0070

GERP RS

-2.5

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