chr16-57447519-C-G

Position:

• chr16-57447519-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020312.4(COQ9):​c.14C>G​(p.Ala5Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000607 in 1,153,166 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A5V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000061 (0 hom.)
• Consequence: COQ9 NM_020312.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: -0.370

Genes affected

COQ9 (HGNC:25302): (coenzyme Q9) This locus represents a mitochondrial ubiquinone biosynthesis gene. The encoded protein is likely necessary for biosynthesis of coenzyme Q10, as mutations at this locus have been associated with autosomal-recessive neonatal-onset primary coenzyme Q10 deficiency.[provided by RefSeq, Sep 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11185977).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COQ9	NM_020312.4	c.14C>G	p.Ala5Gly	missense_variant	1/9	ENST00000262507.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COQ9	ENST00000262507.11	c.14C>G	p.Ala5Gly	missense_variant	1/9	1	NM_020312.4	P1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 0.00000607 AC: 7 AN: 1153166 Hom.: 0 Cov.: 32 AF XY: 0.00000540 AC XY: 3 AN XY: 556010

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: 0.00000734

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

Bravo AF: 0.0000189

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 26, 2023

The c.14C>G (p.A5G) alteration is located in exon 1 (coding exon 1) of the COQ9 gene. This alteration results from a C to G substitution at nucleotide position 14, causing the alanine (A) at amino acid position 5 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Apr 20, 2022

This sequence change replaces alanine, which is neutral and non-polar, with glycine, which is neutral and non-polar, at codon 5 of the COQ9 protein (p.Ala5Gly). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with COQ9-related conditions. 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: "Tolerated"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.099
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.40
CADD	Benign	17
DANN	Benign	0.94
DEOGEN2	Benign	0.0072	T;T;T;T;.
Eigen	Benign	-0.66
Eigen_PC	Benign	-0.82
FATHMM_MKL	Benign	0.0063	N
LIST_S2	Benign	0.75	T;T;T;T;T
M_CAP	Benign	0.038	D
MetaRNN	Benign	0.11	T;T;T;T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.8	L;.;.;.;.
MutationTaster	Benign	0.99	N;N;N;N
PrimateAI	Uncertain	0.51	T
PROVEAN	Benign	-0.73	N;N;N;N;N
REVEL	Benign	0.035
Sift	Uncertain	0.028	D;D;D;D;D
Sift4G	Benign	0.40	T;T;T;T;T
Polyphen		0.18	B;.;.;.;.
Vest4		0.30
MutPred		0.30		Loss of helix (P = 0.0093);Loss of helix (P = 0.0093);Loss of helix (P = 0.0093);Loss of helix (P = 0.0093);Loss of helix (P = 0.0093);
MVP		0.13
MPC		0.16
ClinPred		0.35	T
GERP RS		0.74
Varity_R		0.065
gMVP		0.50

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

Other links and lift over

dbSNP: rs866898130; hg19: chr16-57481431;