NM_030813.6:c.1915G>C

Variant names:

• chr11-72293576-C-G
• rs375934856
• NM_030813.6:c.1915G>C

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM1 PM2

The NM_030813.6(CLPB):​c.1915G>C​(p.Glu639Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,686 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E639K) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CLPB NM_030813.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.70
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• 3-methylglutaconic aciduria, type VIIB

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• neutropenia, severe congenital, 9, autosomal dominant

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• Leigh syndrome

  Inheritance: AR Classification: LIMITED Submitted by: ClinGen

ENSG00000255843 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 9 uncertain in NM_030813.6
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CLPB	NM_030813.6	c.1915G>C	p.Glu639Gln	missense_variant	Exon 17 of 17	ENST00000294053.9	NP_110440.1
CLPB	NM_001258392.3	c.1825G>C	p.Glu609Gln	missense_variant	Exon 16 of 16	ENST00000538039.6	NP_001245321.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CLPB	ENST00000294053.9	c.1915G>C	p.Glu639Gln	missense_variant	Exon 17 of 17	1	NM_030813.6	ENSP00000294053.3
CLPB	ENST00000538039.6	c.1825G>C	p.Glu609Gln	missense_variant	Exon 16 of 16	2	NM_001258392.3	ENSP00000441518.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461686 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727138

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33474

American (AMR) AF: 0.00 AC: 0 AN: 44714

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26126

East Asian (EAS) AF: 0.00 AC: 0 AN: 39694

South Asian (SAS) AF: 0.00 AC: 0 AN: 86218

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53412

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111896

Other (OTH) AF: 0.00 AC: 0 AN: 60386

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.77
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.69	D;.;.;D;.;.
Eigen	Pathogenic	0.75
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Pathogenic	0.98	D;D;D;D;D;D
M_CAP	Uncertain	0.11	D
MetaRNN	Uncertain	0.70	D;D;D;D;D;D
MetaSVM	Benign	-0.77	T
MutationAssessor	Uncertain	2.2	M;.;.;.;.;.
PhyloP100		7.7
PrimateAI	Pathogenic	0.80	T
PROVEAN	Uncertain	-2.7	D;D;D;D;D;.
REVEL	Benign	0.26
Sift	Benign	0.059	T;T;T;D;T;.
Sift4G	Uncertain	0.035	D;T;T;T;T;.
Polyphen		1.0	D;.;P;.;.;.
Vest4		0.66
MutPred		0.52		Loss of helix (P = 0.0167);.;.;.;.;.;
MVP		0.52
MPC		1.1
ClinPred		0.96	D
GERP RS		5.7
Varity_R		0.84
gMVP		0.62
Mutation Taster		=30/70	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: rs375934856; hg19: chr11-72004620;