18-11851696-C-A

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_020412.5(CHMP1B):c.185C>A(p.Ala62Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000991 in 1,613,956 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00018 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000091 ( 0 hom. )

Consequence

CHMP1B
NM_020412.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.10

Variant links:

Genes affected

CHMP1B (HGNC:24287): (charged multivesicular body protein 1B) CHMP1B 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]

CHMP1B links:

GNAL (HGNC:4388): (G protein subunit alpha L) This gene encodes a stimulatory G protein alpha subunit which mediates odorant signaling in the olfactory epithelium. This protein couples dopamine type 1 receptors and adenosine A2A receptors and is widely expressed in the central nervous system. Mutations in this gene have been associated with dystonia 25 and this gene is located in a susceptibility region for bipolar disorder and schizophrenia. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2013]

GNAL links:

CHMP1B-AS1 (HGNC:52778): (CHMP1B antisense RNA 1)

CHMP1B-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.09027842).

BS2

High AC in GnomAd4 at 27 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHMP1B	NM_020412.5 link	c.185C>A	p.Ala62Glu	missense_variant	Exon 1 of 1	ENST00000526991.3	NP_065145.2	Q7LBR1
GNAL	NM_182978.4 link	c.723-10699C>A		intron_variant	Intron 5 of 11	ENST00000334049.11	NP_892023.1	P38405-2
GNAL	NM_001369387.1 link	c.492-10699C>A		intron_variant	Intron 5 of 11	ENST00000423027.8	NP_001356316.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CHMP1B	ENST00000526991.3 link	c.185C>A	p.Ala62Glu	missense_variant	Exon 1 of 1	6	NM_020412.5	ENSP00000432279.1	Q7LBR1
GNAL	ENST00000334049.11 link	c.723-10699C>A		intron_variant	Intron 5 of 11	1	NM_182978.4	ENSP00000334051.5	P38405-2
GNAL	ENST00000423027.8 link	c.492-10699C>A		intron_variant	Intron 5 of 11	1	NM_001369387.1	ENSP00000408489.2	P38405-1

Frequencies

GnomAD3 genomes

AF:

0.000177

AC:

AN:

152146

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00170

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000132

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000233

AC:

AN:

249196

Hom.:

AF XY:

0.000252

AC XY:

AN XY:

135188

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:

0.00162

Gnomad NFE exome

AF:

0.000195

Gnomad OTH exome

AF:

0.000165

GnomAD4 exome

AF:

0.0000910

AC:

133

AN:

1461692

Hom.:

Cov.:

AF XY:

0.0000935

AC XY:

AN XY:

727130

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00127

Gnomad4 NFE exome

AF:

0.0000504

Gnomad4 OTH exome

AF:

0.000133

GnomAD4 genome

AF:

0.000177

AC:

AN:

152264

Hom.:

Cov.:

AF XY:

0.000188

AC XY:

AN XY:

74448

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00170

Gnomad4 NFE

AF:

0.000132

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000874

Hom.:

Bravo

AF:

0.0000302

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000118

AC:

ExAC

AF:

0.000215

AC:

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

Dec 20, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.185C>A (p.A62E) alteration is located in exon 1 (coding exon 1) of the CHMP1B gene. This alteration results from a C to A substitution at nucleotide position 185, causing the alanine (A) at amino acid position 62 to be replaced by a glutamic acid (E). 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

Pathogenic

0.84

BayesDel_addAF

Benign

-0.26

BayesDel_noAF

Benign

-0.29

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.65

Eigen

Benign

0.12

Eigen_PC

Benign

0.020

FATHMM_MKL

Benign

0.067

LIST_S2

Uncertain

0.95

M_CAP

Benign

0.073

MetaRNN

Benign

0.090

MetaSVM

Uncertain

0.091

PrimateAI

Uncertain

0.58

PROVEAN

Uncertain

-2.6

REVEL

Uncertain

0.45

Sift

Benign

0.18

Sift4G

Benign

0.17

Polyphen

0.78

Vest4

0.30

MVP

0.78

MPC

1.5

ClinPred

0.23

GERP RS

1.3

Varity_R

0.43

gMVP

0.75

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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