chr19-7629836-G-C

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 12P and 1B. PVS1_ModeratePM2PP5_Very_StrongBS1_Supporting

The NM_001171155.2(PET100):c.3G>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 0.00000795 in 1,384,244 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 Pathogenic (★★).

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.0000079 ( 0 hom. )

Consequence

PET100
NM_001171155.2 start_lost

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:6

Conservation

PhyloP100: 2.75

Variant links:

Genes affected

PET100 (HGNC:40038): (PET100 cytochrome c oxidase chaperone) Mitochondrial complex IV, or cytochrome c oxidase, is a large transmembrane protein complex that is part of the respiratory electron transport chain of mitochondria. The small protein encoded by this gene plays a role in the biogenesis of mitochondrial complex IV. This protein localizes to the inner mitochondrial membrane and is exposed to the intermembrane space. Mutations in this gene are associated with mitochondrial complex IV deficiency. This gene has a pseudogene on chromosome 3. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Apr 2014]

PET100 links:

ENSG00000268400 (HGNC:):

ENSG00000268400 links:

STXBP2 (HGNC:11445): (syntaxin binding protein 2) This gene encodes a member of the STXBP/unc-18/SEC1 family. The encoded protein is involved in intracellular trafficking, control of SNARE (soluble NSF attachment protein receptor) complex assembly, and the release of cytotoxic granules by natural killer cells. Mutations in this gene are associated with familial hemophagocytic lymphohistiocytosis. Alternatively spliced transcript variants encoding different isoforms have been noted for this gene. [provided by RefSeq, Jan 2013]

STXBP2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 11 ACMG points.

PVS1

Start lost variant, next in-frame start position is after 1 pathogenic variants. Next in-frame start position is after 27 CDS bases. Genomic position: 7629860. Lost 0.122 part of the original CDS.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 19-7629836-G-C is Pathogenic according to our data. Variant chr19-7629836-G-C is described in ClinVar as [Pathogenic]. Clinvar id is 125441.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr19-7629836-G-C is described in Lovd as [Pathogenic].

BS1

Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.00000795 (11/1384244) while in subpopulation MID AF= 0.00105 (6/5692). AF 95% confidence interval is 0.000459. There are 0 homozygotes in gnomad4_exome. There are 3 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PET100	NM_001171155.2 link	c.3G>C	p.Met1?	start_lost	Exon 1 of 4	ENST00000594797.6	NP_001164626.1	P0DJ07
STXBP2	NM_001414484.1 link	c.-195G>C		5_prime_UTR_variant	Exon 1 of 21		NP_001401413.1
PET100	NR_033242.2 link	n.44G>C		non_coding_transcript_exon_variant	Exon 1 of 5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PET100	ENST00000594797.6 link	c.3G>C	p.Met1?	start_lost	Exon 1 of 4	1	NM_001171155.2	ENSP00000470539.1		P0DJ07
ENSG00000268400	ENST00000698368.1 link	n.3G>C		non_coding_transcript_exon_variant	Exon 1 of 20			ENSP00000513686.1		A0A8V8TM65

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000721

AC:

AN:

138612

Hom.:

AF XY:

0.00

AC XY:

AN XY:

74336

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000180

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000795

AC:

AN:

1384244

Hom.:

Cov.:

AF XY:

0.00000439

AC XY:

AN XY:

683058

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000282

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:

0.00000185

Gnomad4 OTH exome

AF:

0.0000346

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000936

Hom.:

Bravo

AF:

0.00000756

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:2

Aug 05, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects the initiator methionine of the PET100 mRNA. The next in-frame methionine is located at codon 10. This variant is present in population databases (no rsID available, gnomAD 0.004%). Disruption of the initiator codon has been observed in individuals with PET100-related conditions (PMID: 24462369, 32313153). It is commonly reported in individuals of Lebanese ancestry (PMID: 24462369, 31406627). ClinVar contains an entry for this variant (Variation ID: 125441). Algorithms developed to predict the effect of variants on protein structure and function are not available or were not evaluated for this variant. Experimental studies have shown that disruption of the initiator codon affects PET100 function (PMID: 24462369). For these reasons, this variant has been classified as Pathogenic. -

Nov 03, 2020

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Founder variant in Lebanese individuals with Leigh syndrome (Lim et al., 2014); Published functional studies demonstrated the protein did not assemble into the typical complex and was not imported into the mitochondria (Lim et al., 2014); This variant alters the initiator Methionine codon, and the resultant protein would be described as p.Met1? using a question mark to signify that it is not known if the loss of Met1 means that all protein translation is completely prevented or if an abnormal protein is produced using an alternate Met; Not observed at a significant frequency in large population cohorts (Lek et al., 2016); This variant is associated with the following publications: (PMID: 26506407, 24462369, 31406627, 32313153) -

Mitochondrial complex 4 deficiency, nuclear type 12

Pathogenic:2

Feb 06, 2014

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

May 26, 2022

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mitochondrial complex IV deficiency, nuclear type 1

Pathogenic:1

Kids Research, The Children's Hospital at Westmead

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

PET100-related disorder

Pathogenic:1

Mar 07, 2024

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The PET100 c.3G>C variant is predicted to disrupt the translation initiation site (Start Loss). This variant was reported as a Lebanese founder variant in individuals with Leigh syndrome (see, for example, Lim et al. 2014. PubMed ID: 24462369; Riley et al. 2020. PubMed ID: 32313153). This variant is reported in 0.0040% of alleles in individuals of Latino descent in gnomAD (http://gnomad.broadinstitute.org/). Taken together, we classify this variant as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.59

BayesDel_noAF

Uncertain

0.12

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.12

T;.;.

Eigen

Uncertain

0.64

Eigen_PC

Uncertain

0.64

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.90

D;D;D

M_CAP

Benign

0.081

MetaRNN

Pathogenic

0.75

D;D;D

MetaSVM

Uncertain

-0.11

PROVEAN

Uncertain

-3.0

.;D;.

REVEL

Uncertain

0.60

Sift

Pathogenic

0.0

.;D;.

Sift4G

Pathogenic

0.0

D;D;D

Polyphen

0.91

P;.;.

Vest4

0.71

MutPred

0.67

Gain of catalytic residue at M1 (P = 0.0194);Gain of catalytic residue at M1 (P = 0.0194);Gain of catalytic residue at M1 (P = 0.0194);

MVP

0.099

ClinPred

0.99

GERP RS

5.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.89

gMVP

0.90

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