2-218661120-C-T

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2PP3_StrongPP5_Very_Strong

The NM_001079866.2(BCS1L):c.133C>T(p.Arg45Cys) variant causes a missense change. The variant allele was found at a frequency of 0.00000889 in 1,461,886 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000089 ( 0 hom. )

Consequence

BCS1L
NM_001079866.2 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5

Conservation

PhyloP100: 4.01

Variant links:

Genes affected

BCS1L (HGNC:1020): (BCS1 homolog, ubiquinol-cytochrome c reductase complex chaperone) This gene encodes a homolog of the S. cerevisiae bcs1 protein which is involved in the assembly of complex III of the mitochondrial respiratory chain. The encoded protein does not contain a mitochondrial targeting sequence but experimental studies confirm that it is imported into mitochondria. Mutations in this gene are associated with mitochondrial complex III deficiency and the GRACILE syndrome. Several alternatively spliced transcripts encoding two different isoforms have been described. [provided by RefSeq, Jan 2016]

BCS1L links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.986

PP5

Variant 2-218661120-C-T is Pathogenic according to our data. Variant chr2-218661120-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 6168.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BCS1L	NM_001079866.2 link	c.133C>T	p.Arg45Cys	missense_variant	Exon 2 of 8	ENST00000359273.8	NP_001073335.1	Q9Y276A0A024R445

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BCS1L	ENST00000359273.8 link	c.133C>T	p.Arg45Cys	missense_variant	Exon 2 of 8	1	NM_001079866.2	ENSP00000352219.3		Q9Y276

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000119

AC:

AN:

251464

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135908

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:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.00000889

AC:

AN:

1461886

Hom.:

Cov.:

AF XY:

0.00000688

AC XY:

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.0000374

Gnomad4 NFE exome

AF:

0.00000629

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000306

Hom.:

Bravo

AF:

0.00000756

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:2

Sep 23, 2024

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 20727375, 12910490, 20518024, 19508421, 38821922, 34662929) -

Jan 25, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 45 of the BCS1L protein (p.Arg45Cys). This variant is present in population databases (rs121908575, gnomAD 0.004%). This missense change has been observed in individual(s) with mitochondrial complex III deficiency (PMID: 12910490). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 6168). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt BCS1L protein function with a positive predictive value of 95%. This variant disrupts the p.Arg45 amino acid residue in BCS1L. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 28322498). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Pili torti-deafness syndrome

Pathogenic:1

Mar 18, 2024

Baylor Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mitochondrial complex III deficiency nuclear type 1

Pathogenic:1

Jun 01, 2009

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Pili torti-deafness syndrome;C1864002:GRACILE syndrome;C3541471:Mitochondrial complex III deficiency nuclear type 1

Pathogenic:1

Apr 02, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.77

BayesDel_addAF

Pathogenic

0.48

BayesDel_noAF

Pathogenic

0.54

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.88

.;D;D;D;D;D;.;D;D;D;D;.

Eigen

Pathogenic

0.90

Eigen_PC

Pathogenic

0.82

FATHMM_MKL

Uncertain

0.85

LIST_S2

Pathogenic

0.99

D;.;D;.;.;.;D;.;.;.;D;D

M_CAP

Pathogenic

0.49

MetaRNN

Pathogenic

0.99

D;D;D;D;D;D;D;D;D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

3.1

.;.;.;M;M;M;.;M;M;M;M;.

PrimateAI

Pathogenic

0.87

PROVEAN

Pathogenic

-7.8

D;D;D;D;D;D;D;D;D;D;D;.

REVEL

Pathogenic

0.94

Sift

Uncertain

0.0010

D;D;D;D;D;D;D;D;D;D;D;.

Sift4G

Pathogenic

0.0010

D;D;D;D;D;D;D;D;D;D;D;.

Polyphen

1.0

.;.;.;D;D;D;.;D;D;D;D;.

Vest4

0.94, 0.94, 0.95, 0.97, 0.96, 0.97

MutPred

0.94

Loss of MoRF binding (P = 0.0148);Loss of MoRF binding (P = 0.0148);Loss of MoRF binding (P = 0.0148);Loss of MoRF binding (P = 0.0148);Loss of MoRF binding (P = 0.0148);Loss of MoRF binding (P = 0.0148);Loss of MoRF binding (P = 0.0148);Loss of MoRF binding (P = 0.0148);Loss of MoRF binding (P = 0.0148);Loss of MoRF binding (P = 0.0148);Loss of MoRF binding (P = 0.0148);Loss of MoRF binding (P = 0.0148);

MVP

0.99

MPC

1.9

ClinPred

0.99

GERP RS

5.5

Varity_R

0.98

gMVP

0.87

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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