13-48362847-C-T
Position:
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_000321.3(RB1):c.751C>T(p.Arg251*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.
Frequency
Genomes: not found (cov: 32)
Consequence
RB1
NM_000321.3 stop_gained
NM_000321.3 stop_gained
Scores
4
2
1
Clinical Significance
Conservation
PhyloP100: 2.82
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]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 18 ACMG points.
PVS1
Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
PM2
Very rare variant in population databases, with high coverage;
PP5
Variant 13-48362847-C-T is Pathogenic according to our data. Variant chr13-48362847-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 428681.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr13-48362847-C-T is described in Lovd as [Pathogenic]. Variant chr13-48362847-C-T is described in Lovd as [Likely_pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
RB1 | NM_000321.3 | c.751C>T | p.Arg251* | stop_gained | 8/27 | ENST00000267163.6 | NP_000312.2 | |
RB1 | NM_001407165.1 | c.751C>T | p.Arg251* | stop_gained | 8/27 | NP_001394094.1 | ||
RB1 | NM_001407166.1 | c.751C>T | p.Arg251* | stop_gained | 8/17 | NP_001394095.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
RB1 | ENST00000267163.6 | c.751C>T | p.Arg251* | stop_gained | 8/27 | 1 | NM_000321.3 | ENSP00000267163.4 | ||
RB1 | ENST00000467505.5 | n.*119C>T | non_coding_transcript_exon_variant | 3/3 | 1 | ENSP00000434702.1 | ||||
RB1 | ENST00000467505.5 | n.*119C>T | 3_prime_UTR_variant | 3/3 | 1 | ENSP00000434702.1 | ||||
RB1 | ENST00000650461.1 | c.751C>T | p.Arg251* | stop_gained | 8/27 | ENSP00000497193.1 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 genomes
Cov.:
32
GnomAD4 exome Cov.: 31
GnomAD4 exome
Cov.:
31
GnomAD4 genome Cov.: 32
GnomAD4 genome
Cov.:
32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:6Other:1
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Retinoblastoma Pathogenic:5
Pathogenic, criteria provided, single submitter | clinical testing | Genetic Diagnostic Laboratory, University of Pennsylvania School of Medicine | May 20, 2024 | Case and Pedigree Information: BILATERAL CASES:11, UNILATERAL CASES:2, TOTAL CASES:13, PEDIGREES:12 (one pedigree contains both unilateral and bilateral cases). ACMG Codes Applied:PVS1, PM2, PS4M - |
Pathogenic, criteria provided, single submitter | clinical testing | St. Jude Molecular Pathology, St. Jude Children's Research Hospital | Nov 12, 2024 | The RB1 c.751C>T (p.Arg251Ter) change is a nonsense variant that is predicted to cause premature protein truncation or absence of protein due to nonsense-mediated decay. This variant has been reported in individuals with retinoblastoma (PMID: 25928201, 33456302, internal data). This variant is also absent in gnomAD v2.1.1. In summary, this variant meets criteria to be classified as pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | Department of Molecular Diagnostics, Institute of Oncology Ljubljana | Apr 02, 2020 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Genetics and Molecular Pathology, SA Pathology | May 03, 2023 | The RB1 c.751C>T variant is classified as Pathogenic (PVS1, PM2, PS4_moderate) The RB1 c.751C>T variant is a single nucleotide change in exon 8/27 which is predicted to result in premature termination of the protein product at codon 251 (PVS1). The variant has been reported in multiple unrelated individuals with a clinical presentation of retinoblastoma (PMID: 8651278, 14722923, 17096365, 34294096) (PS4_Moderate). This variant is absent from population databases (PM2). The variant has been reported in dbSNP (rs1131690863) and in the HGMD database as disease causing (CM941204). It has been reported as pathogenic by other diagnostic laboratories (ClinVar Variation ID: 428681) and in the RB1 lsdb (RB1_000062). - |
Pathogenic, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Aug 09, 2023 | For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 428681). This premature translational stop signal has been observed in individual(s) with familial and sporadic retinoblastoma (PMID: 7704558, 22963398, 23595191, 24688104, 24791139, 25754945, 25928201, 26396485, 26539030, 27582626). In at least one individual the variant was observed to be de novo. It has also been observed to segregate with disease in related individuals. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Arg251*) in the RB1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in RB1 are known to be pathogenic (PMID: 17096365). - |
Hereditary cancer-predisposing syndrome Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Jan 22, 2021 | The p.R251* pathogenic mutation (also known as c.751C>T), located in coding exon 8 of the RB1 gene, results from a C to T substitution at nucleotide position 751. This changes the amino acid from an arginine to a stop codon within coding exon 8. This mutation has been reported in multiple patients diagnosed unilateral or bilateral retinoblastoma (Shahraki K et al. Eye (Lond). 2017 Apr;31:620-627; He MY et al. Mol Vis. 2014 Apr;20:545-52; Saliminejad K et al. J. Genet. 2013 May;92:e36-40; Ahani A et al. Cancer Genet. 2011 Jun;204:316-22; Pradhan MA et al. Clin. Experiment. Ophthalmol. 2010 Apr;38:231-6; Abouzeid H et al. Mol. Vis. 2007 Sep;13:1740-5; Houdayer C et al. Hum. Mutat. 2004 Feb;23:193-202; Lohmann DR et al. Am. J. Hum. Genet. 1996 May;58:940-9). Of note, this mutation is also designated as g.59683C>T in some published literature. This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. - |
Neoplasm Other:1
-, criteria provided, single submitter | clinical testing | Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital | Jul 31, 2024 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Uncertain
D
Vest4
GERP RS
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at