rs1163170578

Positions:

• chr9-128332187-T-G

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PP3_Strong PP5

The NM_016035.5(COQ4):​c.437T>G​(p.Phe146Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000346 in 1,446,250 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 Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: COQ4 NM_016035.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:7 U:3
• Conservation: PhyloP100: 7.48

Genes affected

COQ4 (HGNC:19693): (coenzyme Q4) This gene encodes a component of the coenzyme Q biosynthesis pathway. Coenzyme Q, an essential component of the electron transport chain, shuttles electrons between complexes I or II to complex III of the mitochondrial transport chain. This protein appears to play a structural role in stabilizing a complex that contains most of the coenzyme Q biosynthesis enzymes. Mutations in this gene are associated with mitochondrial disorders linked to coenzyme Q deficiency. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Apr 2015]

COQ4 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM1: In a chain Ubiquinone biosynthesis protein COQ4 homolog, mitochondrial (size 234) in uniprot entity COQ4_HUMAN there are 27 pathogenic changes around while only 3 benign (90%) in NM_016035.5
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.964
• PP5: Variant 9-128332187-T-G is Pathogenic according to our data. Variant chr9-128332187-T-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 488487.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=2, Pathogenic=1, Likely_pathogenic=6}. Variant chr9-128332187-T-G is described in Lovd as [Likely_pathogenic]. Variant chr9-128332187-T-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COQ4	NM_016035.5	c.437T>G	p.Phe146Cys	missense_variant	5/7	ENST00000300452.8	NP_057119.3
COQ4	XM_047423449.1	c.*37T>G		3_prime_UTR_variant	4/4		XP_047279405.1
COQ4	NM_001305942.2	c.*3-1287T>G		intron_variant			NP_001292871.2
COQ4	XM_017014792.2	c.*3-663T>G		intron_variant			XP_016870281.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COQ4	ENST00000300452.8	c.437T>G	p.Phe146Cys	missense_variant	5/7	1	NM_016035.5	ENSP00000300452.3
COQ4	ENST00000461102.1	n.1776T>G		non_coding_transcript_exon_variant	1/2	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000444 AC: 1 AN: 225000 Hom.: 0 AF XY: 0.00000825 AC XY: 1 AN XY: 121282

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: 0.00

Gnomad OTH exome AF: 0.000178

GnomAD4 exome AF: 0.00000346 AC: 5 AN: 1446250 Hom.: 0 Cov.: 31 AF XY: 0.00000557 AC XY: 4 AN XY: 717986

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000272

Gnomad4 OTH exome AF: 0.0000334

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:7 Uncertain:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Neonatal encephalomyopathy-cardiomyopathy-respiratory distress syndrome Pathogenic:5 Uncertain:2

Uncertain significance, no assertion criteria provided	clinical testing	Myelin Disorders Clinic-Children's Medical Center/Medical Genetics Lab-Tarbiat Modares University, Children's Medical Center, Pediatrics Center of Excellence,	-	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genomic Research Center, Shahid Beheshti University of Medical Sciences	Dec 03, 2017	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Institute of Human Genetics Munich, Klinikum Rechts Der Isar, TU München	Dec 11, 2017	- -
Uncertain significance, flagged submission	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 18, 2022	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 (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 488487). This missense change has been observed in individuals with coenzyme Q10 deficiency (PMID: 32860008, 33215859). This variant is present in population databases (no rsID available, gnomAD no frequency). This sequence change replaces phenylalanine, which is neutral and non-polar, with cysteine, which is neutral and slightly polar, at codon 146 of the COQ4 protein (p.Phe146Cys). -
Pathogenic, criteria provided, single submitter	clinical testing	Centogene AG - the Rare Disease Company	-	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	MGZ Medical Genetics Center	Jan 17, 2022	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Neuberg Centre For Genomic Medicine, NCGM	-	The missense variant p.F146C in COQ4 (NM_016035.5) has been previously reported (Bertoli-Avella AM et al). The variant has been submitted to ClinVar as Pathogenic/Likely pathogenic and Uncertain Significance. The p.F146C variant is observed in 1/2,25,000 (0.0004%) alleles from individuals of all background in gnomAD Exomes and is novel (not in any individuals) in 1000 Genomes. The p.F146C missense variant is predicted to be damaging by both SIFT and PolyPhen2. The phenylalanine residue at codon 146 of COQ4 is conserved in all mammalian species. The nucleotide c.437 in COQ4 is predicted conserved by GERP++ and PhyloP across 100 vertebrates. For these reasons, this variant has been classified as Likely Pathogenic. -

not provided Pathogenic:1 Uncertain:1

Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Mar 01, 2018	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen	Oct 23, 2020	- -

Abnormality of the nervous system Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Kariminejad - Najmabadi Pathology & Genetics Center

Jul 10, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.27
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.79	D
Eigen	Pathogenic	0.91
Eigen_PC	Pathogenic	0.86
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.96	D
M_CAP	Uncertain	0.12	D
MetaRNN	Pathogenic	0.96	D
MetaSVM	Uncertain	-0.041	T
MutationAssessor	Pathogenic	3.6	H
PrimateAI	Uncertain	0.71	T
PROVEAN	Pathogenic	-7.1	D
REVEL	Pathogenic	0.68
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.93
MutPred		0.83		Loss of glycosylation at T144 (P = 0.0699);
MVP		0.84
MPC		1.5
ClinPred		1.0	D
GERP RS		5.8
Varity_R		0.90
gMVP		0.79

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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

Other links and lift over

dbSNP: rs1163170578; hg19: chr9-131094466;