17-15999855-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 1P and 1B. PP5BP4

The NM_017775.4(TTC19):c.7C>T(p.Arg3Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000818 in 1,515,046 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. R3R) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000079 ( 1 hom., cov: 32)

Exomes 𝑓: 0.000082 ( 1 hom. )

Consequence

TTC19
NM_017775.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:2

Conservation

PhyloP100: 0.514

Variant links:

Genes affected

TTC19 (HGNC:26006): (tetratricopeptide repeat domain 19) This gene encodes a protein with a tetratricopeptide repeat (TPR) domain containing several TPRs of about 34 aa each. These repeats are found in a variety of organisms including bacteria, fungi and plants, and are involved in a variety of functions including protein-protein interactions. This protein is embedded in the inner mitochondrial membrane and is involved in the formation of the mitochondrial respiratory chain III. It has also been suggested that this protein plays a role in cytokinesis. Mutations in this gene cause mitochondrial complex III deficiency. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Sep 2012]

TTC19 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PP5

Variant 17-15999855-C-T is Pathogenic according to our data. Variant chr17-15999855-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 215303.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=2, Likely_pathogenic=1}. Variant chr17-15999855-C-T is described in Lovd as [Likely_pathogenic].

BP4

Computational evidence support a benign effect (MetaRNN=0.07828671).. Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TTC19	NM_017775.4 linkuse as main transcript	c.7C>T	p.Arg3Trp	missense_variant	1/10	ENST00000261647.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TTC19	ENST00000261647.10 linkuse as main transcript	c.7C>T	p.Arg3Trp	missense_variant	1/10	1	NM_017775.4	P1

Frequencies

GnomAD3 genomes

AF:

0.0000789

AC:

AN:

152110

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:

0.00165

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000188

AC:

AN:

111676

Hom.:

AF XY:

0.000258

AC XY:

AN XY:

62054

show subpopulations

Gnomad AFR exome

AF:

0.000324

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000921

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000458

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000822

AC:

112

AN:

1362824

Hom.:

Cov.:

AF XY:

0.000128

AC XY:

AN XY:

671918

show subpopulations

Gnomad4 AFR exome

AF:

0.0000347

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00113

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000159

Gnomad4 OTH exome

AF:

0.0000882

GnomAD4 genome

AF:

0.0000788

AC:

AN:

152222

Hom.:

Cov.:

AF XY:

0.000107

AC XY:

AN XY:

74428

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:

0.00165

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000340

ExAC

AF:

0.000103

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Pathogenic:1Uncertain:1

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Sep 27, 2022	This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 3 of the TTC19 protein (p.Arg3Trp). 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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 215303). This variant has not been reported in the literature in individuals affected with TTC19-related conditions. This variant is present in population databases (rs756830714, gnomAD 0.1%). -
Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Nov 08, 2012	p.Arg124Trp (CGG>TGG):c.370 C>T in exon 1 of the TTC19 gene (NM_017775.3) The R124W missense change that is likely disease-associated was identified in the TTC19 gene. It has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. The amino acid change is non-conservative in that a positively charged Arginine residue is replaced by an uncharged Tryptophan residue. This change occurs at a highly conserved position in the TTC19 protein. In-silico analyses are not consistent in their predictions of whether or not R124W is damaging to the TTC19 protein. Therefore, R124W is a strong candidate for a disease-causing mutation, however the possibility that it is a benign variant cannot be excluded. The variant is found in MITONUC-MITOP panel(s). -

Mitochondrial complex III deficiency nuclear type 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center

Mar 26, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.36

BayesDel_addAF

Benign

-0.30

BayesDel_noAF

Benign

-0.27

Cadd

Benign

Dann

Benign

0.90

DEOGEN2

Benign

0.018

Eigen

Benign

-0.87

Eigen_PC

Benign

-1.0

FATHMM_MKL

Benign

0.082

LIST_S2

Benign

0.55

M_CAP

Pathogenic

0.91

MetaRNN

Benign

0.078

MetaSVM

Benign

-0.56

MutationAssessor

Benign

0.90

MutationTaster

Benign

1.0

PrimateAI

Pathogenic

0.88

PROVEAN

Benign

-1.6

REVEL

Benign

0.19

Sift

Uncertain

0.015

Sift4G

Uncertain

0.028

Vest4

0.32

MutPred

0.56

Loss of disorder (P = 0);

MVP

0.49

MPC

0.14

ClinPred

0.61

GERP RS

-1.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.8

Varity_R

0.098

gMVP

0.58

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