chr20-429032-C-T

Position:

chr20-429032-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_031229.4(RBCK1):c.1390C>T(p.Arg464Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000254 in 1,612,410 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts 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. R464G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00018 ( 1 hom., cov: 32)

Exomes 𝑓: 0.00026 ( 0 hom. )

Consequence

RBCK1
NM_031229.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 2.86

Variant links:

Genes affected

RBCK1 (HGNC:15864): (RANBP2-type and C3HC4-type zinc finger containing 1) Enables several functions, including identical protein binding activity; protein sequestering activity; and ubiquitin binding activity. Involved in several processes, including T cell receptor signaling pathway; cellular protein metabolic process; and regulation of DNA-binding transcription factor activity. Part of LUBAC complex. Implicated in glycogen storage disease. [provided by Alliance of Genome Resources, Apr 2022]

RBCK1 links:

TBC1D20 (HGNC:16133): (TBC1 domain family member 20) This gene encodes a protein that belongs to a family of GTPase activator proteins of Rab-like small GTPases. The encoded protein and its cognate GTPase, Rab1, bind the nonstructural protein 5A (NS5A) of the hepatitis C virus (HCV) to mediate viral replication. Depletion of this protein inhibits replication of the virus and HCV infection. Mutations in this gene are associated with Warburg micro syndrome 4. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 2014]

TBC1D20 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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=0.26337743).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RBCK1	NM_031229.4 linkuse as main transcript	c.1390C>T	p.Arg464Cys	missense_variant	11/12	ENST00000356286.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RBCK1	ENST00000356286.10 linkuse as main transcript	c.1390C>T	p.Arg464Cys	missense_variant	11/12	1	NM_031229.4	P1	Q9BYM8-1

Frequencies

GnomAD3 genomes

AF:

0.000184

AC:

AN:

152020

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000382

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000181

AC:

AN:

248546

Hom.:

AF XY:

0.000178

AC XY:

AN XY:

134984

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000406

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:

0.000260

Gnomad OTH exome

AF:

0.000329

GnomAD4 exome

AF:

0.000262

AC:

382

AN:

1460390

Hom.:

Cov.:

AF XY:

0.000244

AC XY:

177

AN XY:

726498

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000335

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000317

Gnomad4 OTH exome

AF:

0.000149

GnomAD4 genome

AF:

0.000184

AC:

AN:

152020

Hom.:

Cov.:

AF XY:

0.000162

AC XY:

AN XY:

74242

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000382

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000260

Hom.:

Bravo

AF:

0.000212

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000124

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000356

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Mar 27, 2019

Has not been previously published as pathogenic or benign to our knowledge; Observed in 50/274566 (0.018%) alleles in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect -

Polyglucosan body myopathy type 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Aug 06, 2022

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 464 of the RBCK1 protein (p.Arg464Cys). This variant is present in population databases (rs145423115, gnomAD 0.04%). This variant has not been reported in the literature in individuals affected with RBCK1-related conditions. ClinVar contains an entry for this variant (Variation ID: 574337). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available"). 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

0.17

BayesDel_addAF

Benign

-0.029

BayesDel_noAF

Uncertain

0.040

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.56

D;.;.;.

Eigen

Benign

-0.083

Eigen_PC

Benign

0.11

FATHMM_MKL

Benign

0.74

LIST_S2

Uncertain

0.97

D;D;D;.

M_CAP

Benign

0.023

MetaRNN

Benign

0.26

T;T;T;T

MetaSVM

Benign

-0.59

MutationAssessor

Benign

0.36

N;.;.;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.60

PROVEAN

Uncertain

-3.4

D;.;D;D

REVEL

Uncertain

0.47

Sift

Benign

0.16

T;.;T;T

Sift4G

Benign

0.20

T;.;T;T

Polyphen

0.041

B;P;B;P

Vest4

0.43

MVP

0.80

MPC

0.59

ClinPred

0.11

GERP RS

5.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.47

gMVP

0.63

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