chr1-244835722-C-G

Variant names:

• chr1-244835722-C-G
• NM_198076.6:c.8C>G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_198076.6(COX20):​c.8C>G​(p.Ala3Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000896 in 1,116,624 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A3S) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 9.0e-7 (0 hom.)
• Consequence: COX20 NM_198076.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.24

Genes affected

COX20 (HGNC:26970): (cytochrome c oxidase assembly factor COX20) This gene encodes a protein that plays a role in the assembly of cytochrome C oxidase, an important component of the respiratory pathway. It contains two transmembrane helices and localizes to the mitochondrial membrane. Mutations in this gene can cause mitochondrial complex IV deficiency, which results in ataxia and muscle hypotonia. There are multiple pseudogenes for this gene. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a chain Cytochrome c oxidase assembly protein COX20, mitochondrial (size 116) in uniprot entity COX20_HUMAN there are 6 pathogenic changes around while only 2 benign (75%) in NM_198076.6
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.08420783).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COX20	NM_198076.6	c.8C>G	p.Ala3Gly	missense_variant	Exon 1 of 4	ENST00000411948.7	NP_932342.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COX20	ENST00000411948.7	c.8C>G	p.Ala3Gly	missense_variant	Exon 1 of 4	1	NM_198076.6	ENSP00000406327.2
COX20	ENST00000391839.6	n.67C>G		non_coding_transcript_exon_variant	Exon 1 of 3	1
COX20	ENST00000366528.3	c.8C>G	p.Ala3Gly	missense_variant	Exon 1 of 5	2		ENSP00000355486.3
COX20	ENST00000498262.1	n.64C>G		non_coding_transcript_exon_variant	Exon 1 of 4	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 8.96e-7 AC: 1 AN: 1116624 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 534512

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: 0.00000107

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.094
BayesDel_addAF	Benign	-0.099	T
BayesDel_noAF	Benign	-0.38
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.097	T;.
Eigen	Benign	-0.78
Eigen_PC	Benign	-0.74
FATHMM_MKL	Benign	0.14	N
LIST_S2	Benign	0.46	T;T
M_CAP	Uncertain	0.14	D
MetaRNN	Benign	0.084	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.4	L;L
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-0.19	N;N
REVEL	Benign	0.11
Sift	Uncertain	0.027	D;T
Sift4G	Pathogenic	0.0	D;T
Polyphen		0.29	B;.
Vest4		0.13
MutPred		0.26		Loss of stability (P = 0.043);Loss of stability (P = 0.043);
MVP		0.030
MPC		0.039
ClinPred		0.88	D
GERP RS		4.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.16
gMVP		0.17

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-244999024;