chr7-56102918-T-G

Position:

• chr7-56102918-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_016139.4(CHCHD2):​c.394A>C​(p.Lys132Gln) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: CHCHD2 NM_016139.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.96

Genes affected

CHCHD2 (HGNC:21645): (coiled-coil-helix-coiled-coil-helix domain containing 2) The protein encoded by this gene belongs to a class of eukaryotic CX(9)C proteins characterized by four cysteine residues spaced ten amino acids apart from one another. These residues form disulfide linkages that define a CHCH fold. In response to stress, the protein translocates from the mitochondrial intermembrane space to the nucleus where it binds to a highly conserved 13 nucleotide oxygen responsive element in the promoter of cytochrome oxidase 4I2, a subunit of the terminal enzyme of the electron transport chain. In concert with recombination signal sequence-binding protein J, binding of this protein activates the oxygen responsive element at four percent oxygen. In addition, it has been shown that this protein is a negative regulator of mitochondria-mediated apoptosis. In response to apoptotic stimuli, mitochondrial levels of this protein decrease, allowing BCL2-associated X protein to oligomerize and activate the caspase cascade. Pseudogenes of this gene are found on multiple chromosomes. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2016]

CHCHD2 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHCHD2	NM_016139.4	c.394A>C	p.Lys132Gln	missense_variant	3/4	ENST00000395422.4	NP_057223.1
CHCHD2	NM_001320327.2	c.394A>C	p.Lys132Gln	missense_variant	3/4		NP_001307256.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHCHD2	ENST00000395422.4	c.394A>C	p.Lys132Gln	missense_variant	3/4	1	NM_016139.4	ENSP00000378812.3
CHCHD2	ENST00000473095.1	n.412A>C		non_coding_transcript_exon_variant	3/3	1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 20, 2024

The c.394A>C (p.K132Q) alteration is located in exon 3 (coding exon 3) of the CHCHD2 gene. This alteration results from a A to C substitution at nucleotide position 394, causing the lysine (K) at amino acid position 132 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Uncertain	0.018	T
BayesDel_noAF	Benign	-0.21
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.029	T
Eigen	Uncertain	0.26
Eigen_PC	Uncertain	0.32
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.83	T
M_CAP	Benign	0.057	D
MetaRNN	Uncertain	0.53	D
MetaSVM	Benign	-0.46	T
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-1.5	N
REVEL	Benign	0.26
Sift	Benign	0.13	T
Sift4G	Benign	0.38	T
Polyphen		0.81	P
Vest4		0.51
MutPred		0.38		Loss of ubiquitination at K132 (P = 0.0167);
MVP		0.80
MPC		0.95
ClinPred		0.86	D
GERP RS		5.3
Varity_R		0.26
gMVP		0.52

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr7-56170611;