rs33946522

Variant names:

• chr2-218662989-C-G
• rs33946522
• NM_001079866.2:c.996C>G

Your query was ambiguous. Multiple possible variants found:

• chr2-218662989-C-G
• chr2-218662989-C-T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_001079866.2(BCS1L):​c.996C>G​(p.Asn332Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. N332N) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BCS1L NM_001079866.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.15
• Publications: 10 publications found

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), PanelApp Australia, Orphanet, Ambry Genetics, ClinGen, G2P
• GRACILE syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), G2P
• Leigh syndrome

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: PanelApp Australia, ClinGen
• 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

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.995

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001079866.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BCS1L	NM_001079866.2	MANE Select	c.996C>G	p.Asn332Lys	missense	Exon 7 of 8	NP_001073335.1
	BCS1L	NM_001257342.2		c.996C>G	p.Asn332Lys	missense	Exon 8 of 9	NP_001244271.1
	BCS1L	NM_001257343.2		c.996C>G	p.Asn332Lys	missense	Exon 8 of 9	NP_001244272.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BCS1L	ENST00000359273.8	TSL:1 MANE Select	c.996C>G	p.Asn332Lys	missense	Exon 7 of 8	ENSP00000352219.3
	BCS1L	ENST00000392109.5	TSL:1	c.996C>G	p.Asn332Lys	missense	Exon 8 of 9	ENSP00000375957.1
	BCS1L	ENST00000392111.7	TSL:1	c.996C>G	p.Asn332Lys	missense	Exon 8 of 9	ENSP00000375959.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.040
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.92	D
Eigen	Uncertain	0.21
Eigen_PC	Benign	0.12
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.45	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Uncertain	0.35	D
MutationAssessor	Pathogenic	4.3	H
PhyloP100		1.1
PrimateAI	Uncertain	0.72	T
PROVEAN	Pathogenic	-6.0	D
REVEL	Pathogenic	0.82
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.99
MutPred		0.94		Gain of methylation at N332 (P = 0.0293)
MVP		0.99
MPC		1.7
ClinPred		1.0	D
GERP RS		3.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.96
gMVP		0.99
Mutation Taster		=11/89	disease causing

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

Other links and lift over

dbSNP: rs33946522; hg19: chr2-219527712;