13-48380232-A-G

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1PM2

The NM_000321.3(RB1):c.1489A>G(p.Thr497Ala) variant causes a missense change. The variant allele was found at a frequency of 0.0000025 in 1,596,988 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

RB1
NM_000321.3 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 6.37

Variant links:

Genes affected

RB1 (HGNC:9884): (RB transcriptional corepressor 1) The protein encoded by this gene is a negative regulator of the cell cycle and was the first tumor suppressor gene found. The encoded protein also stabilizes constitutive heterochromatin to maintain the overall chromatin structure. The active, hypophosphorylated form of the protein binds transcription factor E2F1. Defects in this gene are a cause of childhood cancer retinoblastoma (RB), bladder cancer, and osteogenic sarcoma. [provided by RefSeq, Jul 2008]

RB1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM1

In a region_of_interest Domain A (size 206) in uniprot entity RB_HUMAN there are 18 pathogenic changes around while only 0 benign (100%) in NM_000321.3

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RB1	NM_000321.3 link	c.1489A>G	p.Thr497Ala	missense_variant	Exon 16 of 27	ENST00000267163.6	NP_000312.2	P06400A0A024RDV3
RB1	NM_001407165.1 link	c.1489A>G	p.Thr497Ala	missense_variant	Exon 16 of 27		NP_001394094.1
RB1	NM_001407166.1 link	c.1489A>G	p.Thr497Ala	missense_variant	Exon 16 of 17		NP_001394095.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RB1	ENST00000267163.6 link	c.1489A>G	p.Thr497Ala	missense_variant	Exon 16 of 27	1	NM_000321.3	ENSP00000267163.4		P06400
RB1	ENST00000650461.1 link	c.1489A>G	p.Thr497Ala	missense_variant	Exon 16 of 27			ENSP00000497193.1		A0A3B3IS71

Frequencies

GnomAD3 genomes

AF:

0.00000659

AC:

AN:

151686

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000808

AC:

AN:

247442

Hom.:

AF XY:

0.00000747

AC XY:

AN XY:

133924

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:

0.0000179

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000208

AC:

AN:

1445302

Hom.:

Cov.:

AF XY:

0.00000278

AC XY:

AN XY:

719766

show subpopulations

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:

0.00000273

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000659

AC:

AN:

151686

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74016

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:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Retinoblastoma

Uncertain:1

Aug 25, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces threonine with alanine at codon 497 of the RB1 protein (p.Thr497Ala). The threonine residue is highly conserved and there is a small physicochemical difference between threonine and alanine. This variant is present in population databases (rs776531398, ExAC 0.002%) but has not been reported in the literature in individuals with a RB1-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies. In summary, this variant is a rare missense change with uncertain impact on protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Pathogenic

0.19

BayesDel_noAF

Uncertain

0.050

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.78

D;.

Eigen

Uncertain

0.30

Eigen_PC

Uncertain

0.42

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.81

T;T

M_CAP

Benign

0.044

MetaRNN

Uncertain

0.58

D;D

MetaSVM

Uncertain

-0.18

MutationAssessor

Benign

1.1

L;.

PrimateAI

Benign

0.43

PROVEAN

Uncertain

-2.4

N;.

REVEL

Uncertain

0.62

Sift

Benign

0.48

T;.

Sift4G

Benign

0.061

T;.

Polyphen

0.78

P;.

Vest4

0.82

MutPred

0.69

Gain of catalytic residue at S501 (P = 0.0179);Gain of catalytic residue at S501 (P = 0.0179);

MVP

0.91

MPC

0.91

ClinPred

0.66

GERP RS

5.6

Varity_R

0.58

gMVP

0.57

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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