rs776534331

Positions:

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP3BS2

The NM_000321.3(RB1):c.964G>A(p.Glu322Lys) variant causes a missense change. The variant allele was found at a frequency of 0.00000482 in 1,451,636 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. E322G) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000048 ( 0 hom. )

Consequence

RB1
NM_000321.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 4.47

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:

LOC112268118 (HGNC:):

LOC112268118 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.783

BS2

High AC in GnomAdExome4 at 7 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
RB1	NM_000321.3 linkuse as main transcript	c.964G>A	p.Glu322Lys	missense_variant	10/27	ENST00000267163.6
LOC112268118	XR_002957522.2 linkuse as main transcript	n.122-2542C>T		intron_variant, non_coding_transcript_variant
RB1	NM_001407165.1 linkuse as main transcript	c.964G>A	p.Glu322Lys	missense_variant	10/27
RB1	NM_001407166.1 linkuse as main transcript	c.964G>A	p.Glu322Lys	missense_variant	10/17

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RB1	ENST00000267163.6 linkuse as main transcript	c.964G>A	p.Glu322Lys	missense_variant	10/27	1	NM_000321.3	P1
RB1	ENST00000650461.1 linkuse as main transcript	c.964G>A	p.Glu322Lys	missense_variant	10/27

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000402

AC:

AN:

248744

Hom.:

AF XY:

0.00000742

AC XY:

AN XY:

134844

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:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000482

AC:

AN:

1451636

Hom.:

Cov.:

AF XY:

0.00000554

AC XY:

AN XY:

721852

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:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000542

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.00000378

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Retinoblastoma

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 09, 2023

This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 322 of the RB1 protein (p.Glu322Lys). This variant is present in population databases (rs776534331, gnomAD 0.003%). This variant has not been reported in the literature in individuals affected with RB1-related conditions. ClinVar contains an entry for this variant (Variation ID: 836253). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on RB1 protein function. RNA analysis performed to evaluate the impact of this missense change on mRNA splicing indicates it does not significantly alter splicing (Invitae). 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. -

Malignant tumor of urinary bladder

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Baylor Genetics

Oct 25, 2023

- -

Hereditary cancer-predisposing syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 18, 2023

The p.E322K variant (also known as c.964G>A), located in coding exon 10 of the RB1 gene, results from a G to A substitution at nucleotide position 964. The glutamic acid at codon 322 is replaced by lysine, an amino acid with similar properties. This amino acid position is well conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.20

BayesDel_addAF

Pathogenic

0.28

BayesDel_noAF

Pathogenic

0.27

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.85

D;.

Eigen

Uncertain

0.57

Eigen_PC

Uncertain

0.62

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.95

D;D

M_CAP

Uncertain

0.27

MetaRNN

Pathogenic

0.78

D;D

MetaSVM

Pathogenic

0.81

MutationAssessor

Benign

1.9

L;.

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.58

PROVEAN

Uncertain

-3.1

D;.

REVEL

Pathogenic

0.77

Sift

Uncertain

0.0040

D;.

Sift4G

Uncertain

0.010

D;.

Polyphen

0.98

D;.

Vest4

0.66

MutPred

0.40

Loss of ubiquitination at K327 (P = 0.0193);Loss of ubiquitination at K327 (P = 0.0193);

MVP

0.95

MPC

0.80

ClinPred

0.94

GERP RS

5.4

Varity_R

0.56

gMVP

0.87

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.22

Details are displayed if max score is > 0.2

DS_AL_spliceai

0.22

Position offset: -24

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