rs777313457

Positions:

• chr11-72358930-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_030813.6(CLPB):​c.815A>G​(p.Tyr272Cys) variant causes a missense change. The variant allele was found at a frequency of 0.00000343 in 1,457,744 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: 31)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: CLPB NM_030813.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1 O:1
• Conservation: PhyloP100: 6.75

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]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.918

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CLPB	NM_030813.6	c.815A>G	p.Tyr272Cys	missense_variant	6/17	ENST00000294053.9
CLPB	NM_001258392.3	c.725A>G	p.Tyr242Cys	missense_variant	5/16	ENST00000538039.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CLPB	ENST00000294053.9	c.815A>G	p.Tyr272Cys	missense_variant	6/17	1	NM_030813.6	P4
CLPB	ENST00000538039.6	c.725A>G	p.Tyr242Cys	missense_variant	5/16	2	NM_001258392.3	A1
	ENST00000537727.1	n.377+3582T>C		intron_variant, non_coding_transcript_variant		4

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251248 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135782

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: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000880

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000343 AC: 5 AN: 1457744 Hom.: 0 Cov.: 34 AF XY: 0.00000552 AC XY: 4 AN XY: 725104

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: 0.0000188

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 31

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

3-methylglutaconic aciduria, type VIIB Uncertain:1 Other:1

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Nov 22, 2022	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 are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 279606). This missense change has been observed in individuals with 3-methylglutaconic aciduria (PMID: 25597510, 26916670). It has also been observed to segregate with disease in related individuals. This variant is present in population databases (rs777313457, gnomAD 0.004%). This sequence change replaces tyrosine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 272 of the CLPB protein (p.Tyr272Cys). -
not provided, no classification provided	literature only	GeneReviews	-	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.15
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Benign	0.14	T;.;.;T;.;.;.;T;.;.
Eigen	Uncertain	0.64
Eigen_PC	Uncertain	0.61
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Pathogenic	0.99	D;D;D;D;D;D;D;D;D;D
M_CAP	Uncertain	0.29	D
MetaRNN	Pathogenic	0.92	D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	-0.19	T
MutationAssessor	Uncertain	2.4	M;.;.;.;.;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Pathogenic	0.84	D
PROVEAN	Pathogenic	-8.0	D;D;D;D;D;.;.;D;D;.
REVEL	Pathogenic	0.86
Sift	Pathogenic	0.0	D;D;D;D;D;.;.;D;D;.
Sift4G	Pathogenic	0.0	D;D;D;D;D;.;.;.;D;.
Polyphen		1.0	D;.;D;.;.;.;.;.;.;.
Vest4		0.92
MutPred		0.77		Loss of helix (P = 0.1299);.;.;.;.;Loss of helix (P = 0.1299);.;.;.;Loss of helix (P = 0.1299);
MVP		0.85
MPC		1.3
ClinPred		1.0	D
GERP RS		4.7
Varity_R		0.86
gMVP		0.91

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: rs777313457; hg19: chr11-72069974;