NM_005726.6:c.17C>A

Variant names:

• chr12-57782818-C-A
• rs372337739
• NM_005726.6:c.17C>A

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.17C>A​(p.Ser6*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000139 in 1,441,568 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 (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: TSFM NM_005726.6 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 1.93
• Publications: 4 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 64 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 12-57782818-C-A is Pathogenic according to our data. Variant chr12-57782818-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1361252.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.17C>A	p.Ser6*	stop_gained	Exon 1 of 6	ENST00000652027.2	NP_005717.3
TSFM	NM_001172696.2	c.17C>A	p.Ser6*	stop_gained	Exon 1 of 7		NP_001166167.1
TSFM	NM_001172697.2	c.17C>A	p.Ser6*	stop_gained	Exon 1 of 6		NP_001166168.1
TSFM	NM_001172695.2	c.17C>A	p.Ser6*	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.17C>A	p.Ser6*	stop_gained	Exon 1 of 6		NM_005726.6	ENSP00000499171.2
ENSG00000257921	ENST00000546504.1	c.77-292C>A		intron_variant	Intron 1 of 3	2		ENSP00000449544.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000922 AC: 2 AN: 216876 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000324

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000104

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000139 AC: 2 AN: 1441568 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 715290

African (AFR) AF: 0.00 AC: 0 AN: 33006

American (AMR) AF: 0.0000240 AC: 1 AN: 41736

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25718

East Asian (EAS) AF: 0.00 AC: 0 AN: 38476

South Asian (SAS) AF: 0.00 AC: 0 AN: 82956

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51272

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5736

European-Non Finnish (NFE) AF: 9.07e-7 AC: 1 AN: 1103092

Other (OTH) AF: 0.00 AC: 0 AN: 59576

GnomAD4 genome Cov.: 32

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 19, 2024

Baylor Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Pathogenic:1

Jan 15, 2022

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 sequence change creates a premature translational stop signal (p.Ser6*) 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). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with TSFM-related conditions. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.22
CADD	Pathogenic	35
DANN	Uncertain	0.98
Eigen	Uncertain	0.27
Eigen_PC	Benign	-0.0079
FATHMM_MKL	Benign	0.20	N
PhyloP100		1.9
Vest4		0.14
GERP RS		5.0
PromoterAI		-0.13	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Mutation Taster		=33/167	disease causing (fs/PTC)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs372337739; hg19: chr12-58176601;