rs1555098495

Positions:

• chr11-72358891-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_001258392.3(CLPB):​c.764T>C​(p.Leu255Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000717 in 1,393,746 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 Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 30)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: CLPB NM_001258392.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.78

Genes affected

CLPB (HGNC:30664): (ClpB family mitochondrial disaggregase) This gene belongs to the ATP-ases associated with diverse cellular activities (AAA+) superfamily. Members of this superfamily form ring-shaped homo-hexamers and have highly conserved ATPase domains that are involved in various processes including DNA replication, protein degradation and reactivation of misfolded proteins. All members of this family hydrolyze ATP through their AAA+ domains and use the energy generated through ATP hydrolysis to exert mechanical force on their substrates. In addition to an AAA+ domain, the protein encoded by this gene contains a C-terminal D2 domain, which is characteristic of the AAA+ subfamily of Caseinolytic peptidases to which this protein belongs. It cooperates with Hsp70 in the disaggregation of protein aggregates. Allelic variants of this gene are associated with 3-methylglutaconic aciduria, which causes cataracts and neutropenia. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Apr 2015]

CLPB (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.954

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CLPB	NM_030813.6	c.854T>C	p.Leu285Pro	missense_variant	6/17	ENST00000294053.9	NP_110440.1
CLPB	NM_001258392.3	c.764T>C	p.Leu255Pro	missense_variant	5/16	ENST00000538039.6	NP_001245321.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CLPB	ENST00000294053.9	c.854T>C	p.Leu285Pro	missense_variant	6/17	1	NM_030813.6	ENSP00000294053.3
CLPB	ENST00000538039.6	c.764T>C	p.Leu255Pro	missense_variant	5/16	2	NM_001258392.3	ENSP00000441518.1

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome AF: 7.17e-7 AC: 1 AN: 1393746 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 692300

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: 0.00

Gnomad4 NFE exome AF: 9.37e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 30

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

3-methylglutaconic aciduria, type VIIB Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 15, 2017

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with CLPB-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces leucine with proline at codon 285 of the CLPB protein (p.Leu285Pro). The leucine residue is moderately conserved and there is a moderate physicochemical difference between leucine and proline. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.49	D
BayesDel_noAF	Pathogenic	0.47
CADD	Pathogenic	32
DANN	Uncertain	1.0
DEOGEN2	Benign	0.29	T;.;.;T;.;.;.;T;.;.
Eigen	Pathogenic	0.89
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.95	D;D;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.69	D
MetaRNN	Pathogenic	0.95	D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.98	D
MutationAssessor	Pathogenic	4.2	H;.;.;.;.;.;.;.;.;.
PrimateAI	Uncertain	0.77	T
PROVEAN	Pathogenic	-6.5	D;D;D;D;D;.;.;D;D;.
REVEL	Pathogenic	0.92
Sift	Uncertain	0.0010	D;D;D;D;D;.;.;D;D;.
Sift4G	Pathogenic	0.0010	D;D;D;D;D;.;.;.;D;.
Polyphen		1.0	D;.;D;.;.;.;.;.;.;.
Vest4		0.85
MutPred		0.81		Loss of stability (P = 0.0076);.;.;.;.;Loss of stability (P = 0.0076);.;.;.;Loss of stability (P = 0.0076);
MVP		1.0
MPC		1.5
ClinPred		1.0	D
GERP RS		4.4
Varity_R		0.94
gMVP		0.97

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

Other links and lift over

dbSNP: rs1555098495; hg19: chr11-72069935;