NM_001079866.2:c.1127T>C

Variant names:

• chr2-218663253-T-C
• rs1553598145
• NM_001079866.2:c.1127T>C

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001079866.2(BCS1L):​c.1127T>C​(p.Leu376Ser) 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 benign 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. L376L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BCS1L NM_001079866.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.89
• Publications: 0 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), 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

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.28740627).

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.1127T>C	p.Leu376Ser	missense	Exon 8 of 8	NP_001073335.1	Q9Y276
	BCS1L	NM_001257342.2		c.1127T>C	p.Leu376Ser	missense	Exon 9 of 9	NP_001244271.1	Q9Y276
	BCS1L	NM_001257343.2		c.1127T>C	p.Leu376Ser	missense	Exon 9 of 9	NP_001244272.1	A0A024R445

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BCS1L	ENST00000359273.8	TSL:1 MANE Select	c.1127T>C	p.Leu376Ser	missense	Exon 8 of 8	ENSP00000352219.3	Q9Y276
	BCS1L	ENST00000392109.5	TSL:1	c.1127T>C	p.Leu376Ser	missense	Exon 9 of 9	ENSP00000375957.1	Q9Y276
	BCS1L	ENST00000392111.7	TSL:1	c.1127T>C	p.Leu376Ser	missense	Exon 9 of 9	ENSP00000375959.2	Q9Y276

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	Benign	0.093
BayesDel_addAF	Uncertain	0.021	T
BayesDel_noAF	Benign	-0.21
CADD	Benign	20
DANN	Benign	0.81
DEOGEN2	Benign	0.27	T
Eigen	Uncertain	0.30
Eigen_PC	Uncertain	0.31
FATHMM_MKL	Benign	0.53	D
LIST_S2	Benign	0.62	T
M_CAP	Uncertain	0.15	D
MetaRNN	Benign	0.29	T
MetaSVM	Uncertain	0.11	D
MutationAssessor	Benign	1.9	L
PhyloP100		1.9
PrimateAI	Benign	0.35	T
PROVEAN	Benign	-1.6	N
REVEL	Uncertain	0.43
Sift	Benign	0.15	T
Sift4G	Benign	0.32	T
Polyphen		0.61	P
Vest4		0.26
MutPred		0.56		Gain of disorder (P = 0.0025)
MVP		0.98
MPC		0.84
ClinPred		0.35	T
GERP RS		5.3
Varity_R		0.028
gMVP		0.70
Mutation Taster		=82/18	polymorphism

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: rs1553598145; hg19: chr2-219527976;