12-57782803-T-C

Position:

• chr12-57782803-T-C

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_005726.6(TSFM):​c.2T>C​(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000278 in 1,438,266 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 Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000028 (0 hom.)
• Consequence: TSFM NM_005726.6 start_lost
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.25

Genes affected

TSFM (HGNC:12367): (Ts translation elongation factor, mitochondrial) This gene encodes a mitochondrial translation elongation factor. The encoded protein is an enzyme that catalyzes the exchange of guanine nucleotides on the translation elongation factor Tu during the elongation step of mitchondrial protein translation. Mutations in this gene are associated with combined oxidative phosphorylation deficiency-3 syndrome. Alternate splicing results in multiple transcript variants.[provided by RefSeq, Mar 2010]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TSFM	NM_005726.6	c.2T>C	p.Met1?	start_lost	1/6	ENST00000652027.2	NP_005717.3
TSFM	NM_001172696.2	c.2T>C	p.Met1?	start_lost	1/7		NP_001166167.1
TSFM	NM_001172697.2	c.2T>C	p.Met1?	start_lost	1/6		NP_001166168.1
TSFM	NM_001172695.2	c.2T>C	p.Met1?	start_lost	1/5		NP_001166166.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TSFM	ENST00000652027.2	c.2T>C	p.Met1?	start_lost	1/6		NM_005726.6	ENSP00000499171	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000278 AC: 4 AN: 1438266 Hom.: 0 Cov.: 30 AF XY: 0.00000561 AC XY: 4 AN XY: 713224

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: 0.00000363

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 23, 2023

This sequence change affects the initiator methionine of the TSFM mRNA. The next in-frame methionine is located at codon 51. This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TSFM-related conditions. ClinVar contains an entry for this variant (Variation ID: 1959263). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.40
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.13	T;.;.;.;T;.
Eigen	Uncertain	0.32
Eigen_PC	Uncertain	0.27
FATHMM_MKL	Benign	0.63	D
LIST_S2	Uncertain	0.90	D;D;D;D;D;D
M_CAP	Pathogenic	0.62	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D;D
MetaSVM	Uncertain	-0.23	T
MutationTaster	Benign	1.0	D;D;D;D;D;D;D
PROVEAN	Benign	-0.90	N;N;N;N;N;N
REVEL	Uncertain	0.46
Sift	Pathogenic	0.0	D;D;D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D;D;D
Polyphen		0.97	D;.;P;.;.;.
Vest4		0.92
MutPred		0.95		Gain of catalytic residue at M1 (P = 0.0019);Gain of catalytic residue at M1 (P = 0.0019);Gain of catalytic residue at M1 (P = 0.0019);Gain of catalytic residue at M1 (P = 0.0019);Gain of catalytic residue at M1 (P = 0.0019);Gain of catalytic residue at M1 (P = 0.0019);
MVP		0.65
ClinPred		1.0	D
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.95
gMVP		0.76

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr12-58176586;