Genetic Variant BCS1L:c.-50+555C>A (chr2-218660298-C-A) – ACMG Classification: Benign (-14 pts)

Variant summary

Our verdict is Benign. The variant received -14 ACMG points: 0P and 14B. BP4_StrongBP6_ModerateBS1BS2

The NM_001371444.1(BCS1L):c.-173C>A variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00438 in 152,248 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: 𝑓 0.0044 ( 2 hom., cov: 32)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

BCS1L
NM_001371444.1 5_prime_UTR

Scores

Splicing: ADA: 0.00003886

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: 1.50

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

Bjornstad syndrome
Inheritance: AR, AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, G2P, ClinGen, Ambry Genetics
GRACILE syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), G2P
mitochondrial complex III deficiency nuclear type 1
Inheritance: AR Classification: STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
mitochondrial complex III deficiency
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
renal tubulopathy-encephalopathy-liver failure syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Leigh syndrome
Inheritance: AR Classification: LIMITED Submitted by: ClinGen

BCS1L links:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -14 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.78).

BP6

Variant 2-218660298-C-A is Benign according to our data. Variant chr2-218660298-C-A is described in ClinVar as Likely_benign. ClinVar VariationId is 1209025.Status of the report is criteria_provided_single_submitter, 1 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00438 (667/152248) while in subpopulation AFR AF = 0.0156 (650/41534). AF 95% confidence interval is 0.0147. There are 2 homozygotes in GnomAd4. There are 299 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 2 AR,AD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001371444.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
BCS1L	NM_001079866.2	MANE Select	c.-50+555C>A	intron	N/A	NP_001073335.1	Q9Y276
BCS1L	NM_001371444.1		c.-173C>A	5_prime_UTR	Exon 2 of 9	NP_001358373.1	Q9Y276
BCS1L	NM_001371446.1		c.-500C>A	5_prime_UTR	Exon 1 of 8	NP_001358375.1	A0A024R445

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
BCS1L	ENST00000359273.8	TSL:1 MANE Select	c.-50+555C>A	intron	N/A	ENSP00000352219.3	Q9Y276
BCS1L	ENST00000392109.5	TSL:1	c.-50+80C>A	intron	N/A	ENSP00000375957.1	Q9Y276
BCS1L	ENST00000392111.7	TSL:1	c.-50+53C>A	intron	N/A	ENSP00000375959.2	Q9Y276

Frequencies

GnomAD3 genomes

AF:

0.00438

AC:

666

AN:

152130

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0156

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000786

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:

0.0000294

Gnomad OTH

AF:

0.00191

GnomAD4 exome

Data not reliable, filtered out with message: AC0;AS_VQSR

AF:

0.00

AC:

AN:

628

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

336

African (AFR)

AF:

0.00

AC:

AN:

American (AMR)

AF:

0.00

AC:

AN:

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

East Asian (EAS)

AF:

0.00

AC:

AN:

South Asian (SAS)

AF:

0.00

AC:

AN:

European-Finnish (FIN)

AF:

0.00

AC:

AN:

Middle Eastern (MID)

AC:

AN:

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

484

Other (OTH)

AF:

0.00

AC:

AN:

GnomAD4 genome

AF:

0.00438

AC:

667

AN:

152248

Hom.:

Cov.:

AF XY:

0.00402

AC XY:

299

AN XY:

74424

show subpopulations

African (AFR)

AF:

0.0156

AC:

650

AN:

41534

American (AMR)

AF:

0.000719

AC:

AN:

15292

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10600

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68022

Other (OTH)

AF:

0.00189

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.502

Heterozygous variant carriers

109

146

182

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00416

Hom.:

Bravo

AF:

0.00517

Asia WGS

AF:

0.000866

AC:

AN:

3478

ClinVar

ClinVar submissions

Significance:Likely benign

Revision:criteria provided, single submitter

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.78

CADD

Benign

7.4

(source)

DANN

Benign

0.46

PhyloP100

1.5

PromoterAI

-0.011

Neutral

(source)

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000039

dbscSNV1_RF

Benign

0.0020

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over