rs35957924

Variant names:

• chr12-57782806-C-A
• rs35957924
• NM_005726.6:c.5C>A

Your query was ambiguous. Multiple possible variants found:

• chr12-57782806-C-A
• chr12-57782806-C-G
• chr12-57782806-C-T

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_005726.6(TSFM):​c.5C>A​(p.Ser2*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000695 in 1,438,810 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 Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. S2S) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: TSFM NM_005726.6 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: -0.439
• Publications: 0 publications found

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]

TSFM Gene-Disease associations (from GenCC):

• fatal mitochondrial disease due to combined oxidative phosphorylation defect type 3

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
• Leigh syndrome

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen

ENSG00000257921 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 65 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 12-57782806-C-A is Pathogenic according to our data. Variant chr12-57782806-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2679363.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TSFM	NM_005726.6	c.5C>A	p.Ser2*	stop_gained	Exon 1 of 6	ENST00000652027.2	NP_005717.3
TSFM	NM_001172696.2	c.5C>A	p.Ser2*	stop_gained	Exon 1 of 7		NP_001166167.1
TSFM	NM_001172697.2	c.5C>A	p.Ser2*	stop_gained	Exon 1 of 6		NP_001166168.1
TSFM	NM_001172695.2	c.5C>A	p.Ser2*	stop_gained	Exon 1 of 5		NP_001166166.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TSFM	ENST00000652027.2	c.5C>A	p.Ser2*	stop_gained	Exon 1 of 6		NM_005726.6	ENSP00000499171.2
ENSG00000257921	ENST00000546504.1	c.77-304C>A		intron_variant	Intron 1 of 3	2		ENSP00000449544.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.95e-7 AC: 1 AN: 1438810 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 713518

African (AFR) AF: 0.00 AC: 0 AN: 32994

American (AMR) AF: 0.00 AC: 0 AN: 41238

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25674

East Asian (EAS) AF: 0.00 AC: 0 AN: 38272

South Asian (SAS) AF: 0.00 AC: 0 AN: 82626

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51190

Middle Eastern (MID) AF: 0.000174 AC: 1 AN: 5734

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1101602

Other (OTH) AF: 0.00 AC: 0 AN: 59480

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 3

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Fatal mitochondrial disease due to combined oxidative phosphorylation defect type 3 Pathogenic:1

Feb 02, 2023

Baylor Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Pathogenic:1

Jul 29, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. This variant has not been reported in the literature in individuals affected with TSFM-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Ser2*) in the TSFM gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in TSFM are known to be pathogenic (PMID: 17033963, 20435138, 25037205, 27677415). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.23
CADD	Pathogenic	33
DANN	Benign	0.94
Eigen	Benign	0.11
Eigen_PC	Benign	-0.12
FATHMM_MKL	Benign	0.30	N
PhyloP100		-0.44
Vest4		0.14
GERP RS		2.2
PromoterAI		-0.32	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Mutation Taster		=26/174	disease causing (fs/PTC)

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

Other links and lift over

dbSNP: rs35957924; hg19: chr12-58176589;