rs753350745

Positions:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1PM2BP6BS2_Supporting

The NM_000321.3(RB1):c.1180G>A(p.Asp394Asn) variant causes a missense change. The variant allele was found at a frequency of 0.00000346 in 1,443,728 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000035 ( 0 hom. )

Consequence

RB1
NM_000321.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:1

Conservation

PhyloP100: 5.68

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 Uncertain_significance. Variant got 2 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;

BP6

Variant 13-48373457-G-A is Benign according to our data. Variant chr13-48373457-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 428739.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.

BS2

High AC in GnomAdExome4 at 5 AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
RB1	NM_000321.3 linkuse as main transcript	c.1180G>A	p.Asp394Asn	missense_variant	12/27	ENST00000267163.6	NP_000312.2
LOC112268118	XR_002957522.2 linkuse as main transcript	n.121+703C>T		intron_variant, non_coding_transcript_variant
RB1	NM_001407165.1 linkuse as main transcript	c.1180G>A	p.Asp394Asn	missense_variant	12/27		NP_001394094.1
RB1	NM_001407166.1 linkuse as main transcript	c.1180G>A	p.Asp394Asn	missense_variant	12/17		NP_001394095.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RB1	ENST00000267163.6 linkuse as main transcript	c.1180G>A	p.Asp394Asn	missense_variant	12/27	1	NM_000321.3	ENSP00000267163	P1
RB1	ENST00000650461.1 linkuse as main transcript	c.1180G>A	p.Asp394Asn	missense_variant	12/27			ENSP00000497193

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000798

AC:

AN:

250706

Hom.:

AF XY:

0.00000738

AC XY:

AN XY:

135536

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000579

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000346

AC:

AN:

1443728

Hom.:

Cov.:

AF XY:

0.00000139

AC XY:

AN XY:

719250

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000112

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Retinoblastoma

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 12, 2023

This sequence change replaces aspartic acid, which is acidic and polar, with asparagine, which is neutral and polar, at codon 394 of the RB1 protein (p.Asp394Asn). This variant is present in population databases (rs753350745, gnomAD 0.009%). 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: 428739). 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) performed at Invitae indicates that this missense variant is not expected to disrupt RB1 protein function with a negative predictive value of 80%. 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. -

Hereditary cancer-predisposing syndrome

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 28, 2023

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Benign

-0.21

BayesDel_noAF

Benign

-0.35

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.52

D;.

Eigen

Uncertain

0.60

Eigen_PC

Uncertain

0.64

FATHMM_MKL

Uncertain

0.97

LIST_S2

Uncertain

0.92

D;D

M_CAP

Benign

0.056

MetaRNN

Uncertain

0.49

T;T

MetaSVM

Uncertain

0.38

MutationAssessor

Benign

1.0

L;.

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.56

PROVEAN

Benign

-1.6

N;.

REVEL

Uncertain

0.48

Sift

Benign

0.39

T;.

Sift4G

Pathogenic

0.0

D;.

Polyphen

1.0

D;.

Vest4

0.55

MutPred

0.61

Gain of loop (P = 0.0166);Gain of loop (P = 0.0166);

MVP

0.90

MPC

1.3

ClinPred

0.86

GERP RS

5.5

Varity_R

0.49

gMVP

0.54

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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