rs893153652

Positions:

• chr22-30941917-C-A
• chr22-30941917-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_001303256.3(MORC2):​c.672G>T​(p.Gln224His) 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. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q224R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MORC2 NM_001303256.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.27

Genes affected

MORC2 (HGNC:23573): (MORC family CW-type zinc finger 2) This gene encodes a member of the Microrchidia (MORC) protein superfamily. The encoded protein is known to regulate the condensation of heterochromatin in response to DNA damage and play a role in repressing transcription. The protein has been found to regulate the activity of ATP citrate lyase via specific interaction with this enzyme in the cytosol of lipogenic breast cancer cells. The protein also plays a role in lipogenesis and adipocyte differentiation. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Feb 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), MORC2. . Gene score misZ 3.2251 (greater than the threshold 3.09). Trascript score misZ 4.4393 (greater than threshold 3.09). GenCC has associacion of gene with Leigh syndrome, Charcot-Marie-Tooth disease axonal type 2Z, developmental delay, impaired growth, dysmorphic facies, and axonal neuropathy.
• BP4: Computational evidence support a benign effect (MetaRNN=0.1965208).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MORC2	NM_001303256.3	c.672G>T	p.Gln224His	missense_variant	8/26	ENST00000397641.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MORC2	ENST00000397641.8	c.672G>T	p.Gln224His	missense_variant	8/26	5	NM_001303256.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Charcot-Marie-Tooth disease axonal type 2Z Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 08, 2018

This variant is not present in population databases (ExAC no frequency). This sequence change replaces glutamine with histidine at codon 162 of the MORC2 protein (p.Gln162His). The glutamine residue is weakly conserved and there is a small physicochemical difference between glutamine and histidine. This variant has not been reported in the literature in individuals with MORC2-related disease. 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: "Possibly Damaging"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.22
BayesDel_addAF	Benign	-0.057	T
BayesDel_noAF	Benign	-0.32
CADD	Uncertain	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.085	T;.
Eigen	Benign	-0.60
Eigen_PC	Benign	-0.47
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.86	D;D
M_CAP	Benign	0.032	D
MetaRNN	Benign	0.20	T;T
MetaSVM	Benign	-0.81	T
MutationAssessor	Uncertain	2.1	M;.
MutationTaster	Benign	0.99	D;D
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-1.8	N;N
REVEL	Benign	0.14
Sift	Benign	0.13	T;T
Sift4G	Benign	0.093	T;T
Polyphen		0.0060	B;.
Vest4		0.44
MutPred		0.28		Gain of glycosylation at S229 (P = 0.1422);.;
MVP		0.55
MPC		1.7
ClinPred		0.67	D
GERP RS		1.9
Varity_R		0.096
gMVP		0.72

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.13		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: rs893153652; hg19: chr22-31337904;