20-18142283-C-T

Position:

• chr20-18142283-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP5_Moderate

The ENST00000432901.4(PET117):​c.172C>T​(p.Gln58Ter) variant causes a stop gained change. The variant allele was found at a frequency of 0.000000722 in 1,384,882 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 Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: PET117 ENST00000432901.4 stop_gained
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 6.14

Genes affected

PET117 (HGNC:40045): (PET117 cytochrome c oxidase chaperone) Predicted to be involved in mitochondrial cytochrome c oxidase assembly. Located in mitochondrion. Implicated in cytochrome-c oxidase deficiency disease. [provided by Alliance of Genome Resources, Apr 2022]

KAT14 (HGNC:15904): (lysine acetyltransferase 14) CSRP2 is a protein containing two LIM domains, which are double zinc finger motifs found in proteins of diverse function. CSRP2 and some related proteins are thought to act as protein adapters, bridging two or more proteins to form a larger protein complex. The protein encoded by this gene binds to one of the LIM domains of CSRP2 and contains an acetyltransferase domain. Although the encoded protein has been detected in the cytoplasm, it is predominantly a nuclear protein. Alternatively spliced transcript variants have been described. [provided by RefSeq, Jun 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 20-18142283-C-T is Pathogenic according to our data. Variant chr20-18142283-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 981504.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr20-18142283-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PET117	NM_001164811.2	c.172C>T	p.Gln58Ter	stop_gained	2/2	ENST00000432901.4	NP_001158283.1
KAT14	NM_001392073.1	c.-378C>T		5_prime_UTR_variant	2/11	ENST00000688188.1	NP_001379002.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PET117	ENST00000432901.4	c.172C>T	p.Gln58Ter	stop_gained	2/2	1	NM_001164811.2	ENSP00000397881	P1
KAT14	ENST00000688188.1	c.-378C>T		5_prime_UTR_variant	2/11		NM_001392073.1	ENSP00000508684	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.22e-7 AC: 1 AN: 1384882 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 683362

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: 0.00

Gnomad4 OTH exome AF: 0.0000173

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Mitochondrial complex 4 deficiency, nuclear type 19 Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Oct 23, 2020	- -
Likely pathogenic, criteria provided, single submitter	curation	SIB Swiss Institute of Bioinformatics	Dec 04, 2020	This variant is interpreted as Likely pathogenic for Mitochondrial complex IV deficiency,nuclear type 19, autosomal recessive. The following ACMG Tag(s) were applied: Absent from controls (or at extremely low frequency if recessive) in Exome Sequencing Project, 1000 Genomes Project, or Exome Aggregation Consortium (PM2); Cosegregation with disease in multiple affected family members in a gene definitively known to cause the disease (PP1); Protein length changes as a result of in-frame deletions/insertions in a nonrepeat region or stop-loss variants (PM4); Well-established functional studies show a deleterious effect (PS3 downgraded to moderate). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.61	D
BayesDel_noAF	Pathogenic	0.63
CADD	Pathogenic	38
DANN	Uncertain	1.0
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.94
FATHMM_MKL	Pathogenic	0.97	D
MutationTaster	Benign	1.0	D;D;D;D
Vest4		0.30
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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: rs2037617604; hg19: chr20-18122927;