Genetic Variant CHMP2A:p.Met142Ile (chr19-58552108-C-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_014453.4(CHMP2A):c.426G>A(p.Met142Ile) variant causes a missense change. The variant allele was found at a frequency of 0.0000397 in 1,461,876 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.000040 ( 0 hom. )

Consequence

CHMP2A
NM_014453.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.50

Variant links:

Genes affected

CHMP2A (HGNC:30216): (charged multivesicular body protein 2A) CHMP2A belongs to the chromatin-modifying protein/charged multivesicular body protein (CHMP) family. These proteins are components of ESCRT-III (endosomal sorting complex required for transport III), a complex involved in degradation of surface receptor proteins and formation of endocytic multivesicular bodies (MVBs). Some CHMPs have both nuclear and cytoplasmic/vesicular distributions, and one such CHMP, CHMP1A (MIM 164010), is required for both MVB formation and regulation of cell cycle progression (Tsang et al., 2006 [PubMed 16730941]).[supplied by OMIM, Mar 2008]

CHMP2A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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 rank	MANE	Protein	UniProt
CHMP2A	NM_014453.4 link	c.426G>A	p.Met142Ile	missense_variant	Exon 4 of 6	ENST00000312547.7	NP_055268.1	O43633A0A024R4S0
CHMP2A	NM_198426.3 link	c.426G>A	p.Met142Ile	missense_variant	Exon 4 of 6		NP_940818.1	O43633A0A024R4S0
CHMP2A	XM_005258746.3 link	c.426G>A	p.Met142Ile	missense_variant	Exon 4 of 5		XP_005258803.1	M0R1T5
CHMP2A	XM_005258747.4 link	c.426G>A	p.Met142Ile	missense_variant	Exon 4 of 5		XP_005258804.1	M0R1T5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHMP2A	ENST00000312547.7 link	c.426G>A	p.Met142Ile	missense_variant	Exon 4 of 6	1	NM_014453.4	ENSP00000310440.1		O43633

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000795

AC:

AN:

251494

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135920

show subpopulations

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:

0.0000176

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000397

AC:

AN:

1461876

Hom.:

Cov.:

AF XY:

0.0000344

AC XY:

AN XY:

727238

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

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:

0.0000477

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000611

Hom.:

ExAC

AF:

0.00000824

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jul 13, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.426G>A (p.M142I) alteration is located in exon 4 (coding exon 3) of the CHMP2A gene. This alteration results from a G to A substitution at nucleotide position 426, causing the methionine (M) at amino acid position 142 to be replaced by an isoleucine (I). 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

Uncertain

0.48

BayesDel_addAF

Uncertain

0.16

BayesDel_noAF

Uncertain

0.010

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.62

D;D;D;D

Eigen

Benign

-0.060

Eigen_PC

Benign

0.056

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

.;.;D;D

M_CAP

Benign

0.054

MetaRNN

Uncertain

0.55

D;D;D;D

MetaSVM

Benign

-0.61

MutationAssessor

Benign

1.8

L;L;L;.

PrimateAI

Pathogenic

0.82

PROVEAN

Uncertain

-2.7

.;.;D;.

REVEL

Uncertain

0.51

Sift

Benign

0.085

.;.;T;.

Sift4G

Benign

0.063

T;T;T;.

Polyphen

0.17

B;B;B;.

Vest4

0.62

MutPred

0.53

Loss of glycosylation at K139 (P = 0.2319);Loss of glycosylation at K139 (P = 0.2319);Loss of glycosylation at K139 (P = 0.2319);Loss of glycosylation at K139 (P = 0.2319);

MVP

0.82

MPC

0.61

ClinPred

0.46

GERP RS

3.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.38

gMVP

0.83

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over