chr13-48303700-CGTGACGCCGCGGGCGGAA-C

Position:

• chr13-48303700-CGTGACGCCGCGGGCGGAA-C

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM2 PP5_Very_Strong

The 13-48303700-CGTGACGCCGCGGGCGGAA-C variant causes a non coding transcript exon change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: RB1-DT NR_046414.2 non_coding_transcript_exon
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 3.76

Genes affected

RB1-DT (HGNC:42778): (RB1 divergent transcript)

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]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 13-48303700-CGTGACGCCGCGGGCGGAA-C is Pathogenic according to our data. Variant chr13-48303700-CGTGACGCCGCGGGCGGAA-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 995907.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RB1-DT	NR_046414.2			non_coding_transcript_exon_variant	1/3
RB1	NM_000321.3			upstream_gene_variant		ENST00000267163.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RB1	ENST00000267163.6			upstream_gene_variant		1	NM_000321.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Retinoblastoma Pathogenic:3

Likely pathogenic, criteria provided, single submitter	research	Department of Pediatrics, Memorial Sloan Kettering Cancer Center	Dec 15, 2020	- -
Likely 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:2, UNILATERAL CASES:1, TOTAL CASES:3, PEDIGREES:2. ACMG Codes Applied:PM1, PM2, PS4SUP -
Likely pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 23, 2023	This variant occurs in a non-coding region of the RB1 gene. It does not change the encoded amino acid sequence of the RB1 protein. This variant is not present in population databases (gnomAD no frequency). This variant has been observed in individual(s) with retinoblastoma (PMID: 12541220, 33258708; Invitae). Algorithms developed to predict the effect of variants on protein structure and function are not available or were not evaluated for this variant. Experimental studies have shown that this variant affects RB1 function (PMID: 1881452, 8049153, 33258708). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr13-48877836;