chr2-218661219-A-G

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 11P and 1B. PM2PP3PP5_Very_StrongBP4

The NM_001079866.2(BCS1L):c.232A>G(p.Ser78Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000269 in 1,614,168 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

Frequency

Genomes: 𝑓 0.00039 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00026 ( 0 hom. )

Consequence

BCS1L
NM_001079866.2 missense

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:15

Conservation

PhyloP100: 9.30

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 10 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

Multiple lines of computational evidence support a deleterious effect 7: BayesDel_addAF, BayesDel_noAF, Cadd, Eigen, M_CAP, phyloP100way_vertebrate, REVEL [when AlphaMissense, max_spliceai, FATHMM_MKL, MetaRNN, MutationTaster was below the threshold]

PP5

Variant 2-218661219-A-G is Pathogenic according to our data. Variant chr2-218661219-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 6167.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-218661219-A-G is described in Lovd as [Pathogenic].

BP4

Computational evidence support a benign effect (MetaRNN=0.10026163). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BCS1L	NM_001079866.2 link	c.232A>G	p.Ser78Gly	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.232A>G	p.Ser78Gly	missense_variant	Exon 2 of 8	1	NM_001079866.2	ENSP00000352219.3		Q9Y276

Frequencies

GnomAD3 genomes

AF:

0.000394

AC:

AN:

152162

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

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:

0.00434

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000176

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000465

AC:

117

AN:

251484

Hom.:

AF XY:

0.000471

AC XY:

AN XY:

135916

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:

0.00425

Gnomad NFE exome

AF:

0.000211

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000257

AC:

375

AN:

1461888

Hom.:

Cov.:

AF XY:

0.000257

AC XY:

187

AN XY:

727242

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:

0.00378

Gnomad4 NFE exome

AF:

0.000145

Gnomad4 OTH exome

AF:

0.000199

GnomAD4 genome

AF:

0.000394

AC:

AN:

152280

Hom.:

Cov.:

AF XY:

0.000631

AC XY:

AN XY:

74454

show subpopulations

Gnomad4 AFR

AF:

0.0000481

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00434

Gnomad4 NFE

AF:

0.000176

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000107

Hom.:

Bravo

AF:

0.0000491

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000519

AC:

ExAC

AF:

0.000387

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000237

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:15

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

GRACILE syndrome

Pathogenic:7

Jul 14, 2016

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The BCS1L c.232A>G (p.Ser78Gly) variant involves the alteration of a conserved nucleotide. 4/4 in silico tools predict a damaging outcome for this variant (SNPs&GO not captured due to low reliability index). This variant was found in 48/122498 control chromosomes at a frequency of 0.0003918, which does not exceed the estimated maximal expected allele frequency of a pathogenic BCS1L variant (0.0004725). Homozygotes of this variant have been reported exclusively in Finnish patients with GRACILE syndrome. In addition, multiple clinical diagnostic laboratories/reputable databases classified this variant as pathogenic. Taken together, this variant is classified as pathogenic. -

Sep 26, 2014

Courtagen Diagnostics Laboratory, Courtagen Life Sciences

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 09, 2019

Myriad Genetics, Inc.

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

NM_004328.4(BCS1L):c.232A>G(S78G) is classified as pathogenic in the context of BCS1L-related disorders. Sources cited for classification include the following: PMID 12215968 and 21274865. Classification of NM_004328.4(BCS1L):c.232A>G(S78G) is based on the following criteria: This is a well-established pathogenic variant in the literature that has been observed more frequently in patients with clinical diagnoses than in healthy populations. Please note: this variant was assessed in the context of healthy population screening. -

Jan 19, 2021

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Oct 01, 2002

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sep 08, 2017

Institute of Human Genetics Munich, Klinikum Rechts Der Isar, TU München

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Pathogenic:4

Oct 01, 2021

CeGaT Center for Human Genetics Tuebingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 08, 2016

Laboratory of Molecular Genetics (Pr. Bezieau's lab), CHU de Nantes

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jul 23, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces serine, which is neutral and polar, with glycine, which is neutral and non-polar, at codon 78 of the BCS1L protein (p.Ser78Gly). This variant is present in population databases (rs28937590, gnomAD 0.4%), and has an allele count higher than expected for a pathogenic variant. This missense change has been observed in individuals with clinical features of BCS1L-related conditions (PMID: 12215968, 12547234, 18386115, 19508421). It is commonly reported in individuals of Finnish ancestry (PMID: 12215968). ClinVar contains an entry for this variant (Variation ID: 6167). 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%. Experimental studies have shown that this missense change affects BCS1L function (PMID: 12215968, 21274865). For these reasons, this variant has been classified as Pathogenic. -

Dec 09, 2022

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Functional studies demonstrate that S78G is associated with decreased stability of the BCS1L protein (Visapaa et al., 2002); Transgenic mice with homozygosity for the S78G variant demonstrate decreased BCS1L expression and decreased Rieske iron-sulfur protein incorporation into complex III (Davoudi et al., 2014); This variant is associated with the following publications: (PMID: 21274865, 27997587, 29782205, 28424480, 30530468, 22829922, 18386115, 31980526, 12547234, 27809283, 32637629, 34662929, 24466228, 12215968) -

Pili torti-deafness syndrome

Pathogenic:1

Dec 24, 2023

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mitochondrial complex III deficiency nuclear type 1

Pathogenic:1

Jul 21, 2015

Counsyl

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

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

Pathogenic:1

May 09, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

BCS1L-related disorder

Pathogenic:1

Mar 19, 2024

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The BCS1L c.232A>G variant is predicted to result in the amino acid substitution p.Ser78Gly. This variant has been reported in the homozygous and compound heterozygous state in individuals with GRACILE syndrome (see, for example, Visapää et al. 2002. PubMed ID: 12215968 and Fellman et al. 2008. PubMed ID: 18386115). Transgenic mice homozygous for the p.Ser78Gly variant resemble the human syndrome with features including hepatopathy with progressive complex III deficiency and short lifespan (see for example Kotarsky et al. 2012. PubMed ID: 22829922). This variant is reported in 0.41% of alleles in individuals of European (Finnish) descent in gnomAD (http://gnomad.broadinstitute.org/) and is interpreted as pathogenic by multiple laboratories in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/6167/). Based on the available evidence, this variant is interpreted as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.25

BayesDel_addAF

Pathogenic

0.35

BayesDel_noAF

Pathogenic

0.55

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.79

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

Eigen

Pathogenic

0.88

Eigen_PC

Pathogenic

0.84

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.94

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

M_CAP

Pathogenic

0.35

MetaRNN

Benign

0.10

T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.9

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

PrimateAI

Uncertain

0.79

PROVEAN

Uncertain

-3.7

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

REVEL

Pathogenic

0.95

Sift

Uncertain

0.0030

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

Sift4G

Benign

0.11

T;T;T;T;T;T;T;T;T;T;.

Polyphen

0.99

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

Vest4

0.90, 0.90, 0.91, 0.94, 0.94, 0.94

MVP

0.99

MPC

0.87

ClinPred

0.24

GERP RS

5.5

Varity_R

0.82

gMVP

0.80

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

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