17-10681144-A-T

Position:

chr17-10681144-A-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2PM5PP3_Moderate

The NM_004589.4(SCO1):c.881T>A(p.Met294Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000347 in 1,614,058 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 Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M294V) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000038 ( 0 hom. )

Consequence

SCO1
NM_004589.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 8.87

Variant links:

Genes affected

SCO1 (HGNC:10603): (synthesis of cytochrome C oxidase 1) Mammalian cytochrome c oxidase (COX) catalyzes the transfer of reducing equivalents from cytochrome c to molecular oxygen and pumps protons across the inner mitochondrial membrane. In yeast, 2 related COX assembly genes, SCO1 and SCO2 (synthesis of cytochrome c oxidase), enable subunits 1 and 2 to be incorporated into the holoprotein. This gene is the human homolog to the yeast SCO1 gene. [provided by RefSeq, Jul 2008]

SCO1 links:

ENSG00000263388 (HGNC:):

ENSG00000263388 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr17-10681145-T-C is described in Lovd as [Pathogenic].

PP3

MetaRNN computational evidence supports a deleterious effect, 0.918

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SCO1	NM_004589.4 linkuse as main transcript	c.881T>A	p.Met294Lys	missense_variant	6/6	ENST00000255390.10	NP_004580.1	O75880

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SCO1	ENST00000255390.10 linkuse as main transcript	c.881T>A	p.Met294Lys	missense_variant	6/6	1	NM_004589.4	ENSP00000255390.5		O75880

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152176

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000159

AC:

AN:

251476

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135906

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:

0.0000352

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000376

AC:

AN:

1461882

Hom.:

Cov.:

AF XY:

0.0000440

AC XY:

AN XY:

727238

show subpopulations

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:

0.0000477

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152176

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74334

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Jul 31, 2018

The SCO1 .881T>A; p.Met294Lys variant (rs775176412), to our knowledge, has not been reported in the medical literature or gene specific databases. However, a different variant at the same codon, p.Met294Val, has been reported in a patient with a fatal infantile encephalopathy and who was compound heterozygous for p.Met294Val and a loss of function allele in SCO1 (p.Val93Ter; Leary 2013). Functional characterization of p.Met294Val protein revealed a decrease in cytochrome c oxidase (complex IV) activity, although the authors note that the reduction in activity is modest, and that pathogenicity of missense variants may be related to residual activity (Leary 2013). The p.Met294Lys variant identified in this case is found in the general population with an allele frequency in non-Finnish Europeans of 0.002% (2/111,692 alleles) in the Genome Aggregation Database. The methionine at codon 294 is moderately conserved and computational analyses (SIFT, PolyPhen-2) predict that the substituted lysine is deleterious. However, based on the available information, the clinical significance of this variant is uncertain. -

Mitochondrial complex 4 deficiency, nuclear type 4

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Apr 26, 2022

- -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 15, 2024

The c.881T>A (p.M294K) alteration is located in exon 6 (coding exon 6) of the SCO1 gene. This alteration results from a T to A substitution at nucleotide position 881, causing the methionine (M) at amino acid position 294 to be replaced by a lysine (K). 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

Labcorp Genetics (formerly Invitae), Labcorp

Dec 02, 2021

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 are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C35"). ClinVar contains an entry for this variant (Variation ID: 811095). This variant has not been reported in the literature in individuals affected with SCO1-related conditions. This variant is present in population databases (rs775176412, gnomAD 0.002%). This sequence change replaces methionine, which is neutral and non-polar, with lysine, which is basic and polar, at codon 294 of the SCO1 protein (p.Met294Lys). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.70

BayesDel_addAF

Pathogenic

0.40

BayesDel_noAF

Pathogenic

0.35

CADD

Uncertain

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.42

T;T

Eigen

Uncertain

0.48

Eigen_PC

Uncertain

0.49

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Benign

0.81

T;T

M_CAP

Uncertain

0.27

MetaRNN

Pathogenic

0.92

D;D

MetaSVM

Uncertain

0.52

MutationAssessor

Uncertain

2.7

M;.

PrimateAI

Uncertain

0.62

PROVEAN

Pathogenic

-4.7

D;.

REVEL

Pathogenic

0.85

Sift

Benign

0.13

T;.

Sift4G

Uncertain

0.051

T;T

Polyphen

0.41

B;.

Vest4

0.92

MVP

0.88

MPC

0.33

ClinPred

0.95

GERP RS

5.7

Varity_R

0.84

gMVP

0.93

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