NM_005726.6:c.796C>A

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_005726.6(TSFM):c.796C>A(p.Leu266Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00122 in 1,602,486 control chromosomes in the GnomAD database, including 31 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L266H) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0064 ( 12 hom., cov: 32)

Exomes 𝑓: 0.00068 ( 19 hom. )

Consequence

TSFM
NM_005726.6 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:7

Conservation

PhyloP100: 0.922

Publications

3 publications found

Variant links:

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

TSFM links:

ENSG00000257921 (HGNC:):

ENSG00000257921 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.005405307).

BP6

Variant 12-57796401-C-A is Benign according to our data. Variant chr12-57796401-C-A is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 235467.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00643 (979/152332) while in subpopulation AFR AF = 0.0223 (928/41558). AF 95% confidence interval is 0.0211. There are 12 homozygotes in GnomAd4. There are 496 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 12 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TSFM	NM_005726.6 link	c.796C>A	p.Leu266Ile	missense_variant	Exon 6 of 6	ENST00000652027.2	NP_005717.3	P43897-1E5KS95
TSFM	NM_001172696.2 link	c.859C>A	p.Leu287Ile	missense_variant	Exon 7 of 7		NP_001166167.1	P43897-2
TSFM	NM_001172695.2 link	c.*204C>A		3_prime_UTR_variant	Exon 5 of 5		NP_001166166.1	P43897-3
TSFM	NM_001172697.2 link	c.571+3328C>A		intron_variant	Intron 5 of 5		NP_001166168.1	P43897-4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TSFM	ENST00000652027.2 link	c.796C>A	p.Leu266Ile	missense_variant	Exon 6 of 6		NM_005726.6	ENSP00000499171.2		P43897-1

Frequencies

GnomAD3 genomes

AF:

0.00639

AC:

972

AN:

152214

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0222

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00235

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00478

GnomAD2 exomes

AF:

0.00186

AC:

427

AN:

229150

AF XY:

0.00138

show subpopulations

Gnomad AFR exome

AF:

0.0252

Gnomad AMR exome

AF:

0.00142

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000118

Gnomad OTH exome

AF:

0.00138

GnomAD4 exome

AF:

0.000676

AC:

981

AN:

1450154

Hom.:

Cov.:

AF XY:

0.000579

AC XY:

417

AN XY:

720300

show subpopulations

African (AFR)

AF:

0.0229

AC:

762

AN:

33290

American (AMR)

AF:

0.00144

AC:

AN:

42376

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25866

East Asian (EAS)

AF:

0.00

AC:

AN:

39314

South Asian (SAS)

AF:

0.000118

AC:

AN:

84520

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52712

Middle Eastern (MID)

AF:

0.00243

AC:

AN:

5754

European-Non Finnish (NFE)

AF:

0.0000452

AC:

AN:

1106322

Other (OTH)

AF:

0.00140

AC:

AN:

60000

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

126

189

252

315

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

120

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00643

AC:

979

AN:

152332

Hom.:

Cov.:

AF XY:

0.00666

AC XY:

496

AN XY:

74490

show subpopulations

African (AFR)

AF:

0.0223

AC:

928

AN:

41558

American (AMR)

AF:

0.00235

AC:

AN:

15312

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.000207

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00680

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68034

Other (OTH)

AF:

0.00473

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

100

151

201

251

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00261

Hom.:

Bravo

AF:

0.00713

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.0220

AC:

ESP6500EA

AF:

0.000349

AC:

ExAC

AF:

0.00221

AC:

268

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:4

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Apr 13, 2015

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Mar 03, 2015

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Fatal mitochondrial disease due to combined oxidative phosphorylation defect type 3

Benign:2

Nov 11, 2019

Natera, Inc.

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

TSFM-related disorder

Benign:1

May 03, 2019

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.081

BayesDel_addAF

Benign

-0.42

BayesDel_noAF

Benign

-0.36

CADD

Uncertain

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.079

T;.

Eigen

Benign

-0.014

Eigen_PC

Benign

0.14

FATHMM_MKL

Uncertain

0.82

LIST_S2

Benign

0.81

T;T

MetaRNN

Benign

0.0054

T;T

MetaSVM

Benign

-0.77

MutationAssessor

Benign

1.5

L;.

PhyloP100

0.92

PrimateAI

Uncertain

0.48

PROVEAN

Benign

-0.48

N;N

REVEL

Benign

0.16

Sift

Benign

0.18

T;T

Sift4G

Benign

0.53

T;T

Polyphen

0.016

B;P

Vest4

0.28

MVP

0.83

MPC

0.30

ClinPred

0.012

GERP RS

4.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.087

gMVP

0.19

Mutation Taster

=99/1

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over