2-86505929-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_016079.4(CHMP3):c.544A>G(p.Ser182Gly) variant causes a missense change. The variant allele was found at a frequency of 0.0000028 in 1,426,514 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000028 (0 hom.)
• Consequence: CHMP3 NM_016079.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.06

Genes affected

CHMP3 (HGNC:29865): (charged multivesicular body protein 3) This gene encodes a protein that sorts transmembrane proteins into lysosomes/vacuoles via the multivesicular body (MVB) pathway. This protein, along with other soluble coiled-coil containing proteins, forms part of the ESCRT-III protein complex that binds to the endosomal membrane and recruits additional cofactors for protein sorting into the MVB. This protein may also co-immunoprecipitate with a member of the IFG-binding protein superfamily. Alternative splicing results in multiple transcript variants. Read-through transcription also exists between this gene and the upstream ring finger protein 103 (RNF103) gene. [provided by RefSeq, Nov 2010]

RNF103-CHMP3 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2595588).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHMP3	NM_016079.4	c.544A>G	p.Ser182Gly	missense_variant	6/6	ENST00000263856.9
RNF103-CHMP3	NM_001198954.1	c.631A>G	p.Ser211Gly	missense_variant	8/8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHMP3	ENST00000263856.9	c.544A>G	p.Ser182Gly	missense_variant	6/6	1	NM_016079.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000439 AC: 1 AN: 227808 Hom.: 0 AF XY: 0.00000807 AC XY: 1 AN XY: 123902

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: 0.00000957

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000280 AC: 4 AN: 1426514 Hom.: 0 Cov.: 30 AF XY: 0.00000423 AC XY: 3 AN XY: 709090

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: 0.00

Gnomad4 NFE exome AF: 0.00000366

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

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

May 17, 2023

The c.544A>G (p.S182G) alteration is located in exon 6 (coding exon 6) of the CHMP3 gene. This alteration results from a A to G substitution at nucleotide position 544, causing the serine (S) at amino acid position 182 to be replaced by a glycine (G). 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	0.067
BayesDel_addAF	Benign	-0.052	T
BayesDel_noAF	Benign	-0.31
Cadd	Benign	23
Dann	Uncertain	0.99
DEOGEN2	Benign	0.28	T;.;.;.
Eigen	Uncertain	0.28
Eigen_PC	Uncertain	0.41
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.79	T;T;T;T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.26	T;T;T;T
MetaSVM	Benign	-0.50	T
MutationAssessor	Benign	1.9	L;.;.;.
MutationTaster	Benign	1.0	D;D;D;D
PROVEAN	Benign	-1.6	N;N;N;.
REVEL	Benign	0.23
Sift	Benign	0.28	T;T;T;.
Sift4G	Benign	0.30	T;T;T;T
Polyphen		0.24	B;P;.;.
Vest4		0.17
MutPred		0.35		Loss of phosphorylation at S182 (P = 0.0343);.;.;.;
MVP		0.83
MPC		0.18
ClinPred		0.46	T
GERP RS		6.0
Varity_R		0.26
gMVP		0.46

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: rs1200503151; hg19: chr2-86733052;