rs754414354

Positions:

chr2-218661121-G-A

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM2PM5PP3_StrongPP5

The ENST00000359273.8(BCS1L):c.134G>A(p.Arg45His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000217 in 1,614,044 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R45C) has been classified as Likely pathogenic.

Frequency

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

Exomes 𝑓: 0.000023 ( 0 hom. )

Consequence

BCS1L
ENST00000359273.8 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3U:1

Conservation

PhyloP100: 9.98

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 Likely_pathogenic. Variant got 9 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: 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.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.979

PP5

Variant 2-218661121-G-A is Pathogenic according to our data. Variant chr2-218661121-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 554577.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=2, Pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BCS1L	NM_001079866.2 linkuse as main transcript	c.134G>A	p.Arg45His	missense_variant	2/8	ENST00000359273.8	NP_001073335.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BCS1L	ENST00000359273.8 linkuse as main transcript	c.134G>A	p.Arg45His	missense_variant	2/8	1	NM_001079866.2	ENSP00000352219	P1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152154

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000239

AC:

AN:

251480

Hom.:

AF XY:

0.0000441

AC XY:

AN XY:

135918

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:

0.0000352

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000233

AC:

AN:

1461890

Hom.:

Cov.:

AF XY:

0.0000303

AC XY:

AN XY:

727248

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.0000252

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152154

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74322

show subpopulations

Gnomad4 AFR

AF:

0.0000241

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:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ExAC

AF:

0.0000330

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 11, 2023	This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 45 of the BCS1L protein (p.Arg45His). This variant is present in population databases (rs754414354, gnomAD 0.004%). This missense change has been observed in individual(s) with Bjornstad syndrome (PMID: 28322498). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 554577). 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: 12910490, 20727375). 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. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Jun 03, 2022	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Mar 10, 2022	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: 28322498) -

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

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Myriad Genetics, Inc.

Nov 10, 2021

NM_004328.4(BCS1L):c.134G>A(R45H) is a missense variant classified as a variant of uncertain significance in the context of BCS1L-related disorders. R45H has been observed in cases with relevant disease (PMID: 28322498). Functional assessments of this variant are not available in the literature. R45H has been observed in population frequency databases (gnomAD: NFE 0.01%). In summary, there is insufficient evidence to classify NM_004328.4(BCS1L):c.134G>A(R45H) as pathogenic or benign. Please note: this variant was assessed in the context of healthy population screening. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.44

BayesDel_addAF

Pathogenic

0.45

BayesDel_noAF

Pathogenic

0.54

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.74

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

Eigen

Pathogenic

0.98

Eigen_PC

Pathogenic

0.94

FATHMM_MKL

Uncertain

0.97

LIST_S2

Pathogenic

0.99

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

M_CAP

Pathogenic

0.41

MetaRNN

Pathogenic

0.98

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

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.7

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

MutationTaster

Benign

1.0

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

PrimateAI

Pathogenic

0.85

PROVEAN

Pathogenic

-4.8

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

REVEL

Pathogenic

0.89

Sift

Uncertain

0.0020

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

Sift4G

Uncertain

0.045

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

Polyphen

1.0

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

Vest4

0.90, 0.90, 0.92, 0.88

MutPred

0.90

Loss of MoRF binding (P = 0.0279);Loss of MoRF binding (P = 0.0279);Loss of MoRF binding (P = 0.0279);Loss of MoRF binding (P = 0.0279);Loss of MoRF binding (P = 0.0279);Loss of MoRF binding (P = 0.0279);Loss of MoRF binding (P = 0.0279);Loss of MoRF binding (P = 0.0279);Loss of MoRF binding (P = 0.0279);Loss of MoRF binding (P = 0.0279);Loss of MoRF binding (P = 0.0279);Loss of MoRF binding (P = 0.0279);

MVP

0.99

MPC

1.8

ClinPred

0.98

GERP RS

5.5

Varity_R

0.75

gMVP

0.83

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