RB1-LOVD

RB1-LOVD catalogs variants in the RB1 gene, correlating them with pRB protein domains and clinical presentation to support retinoblastoma research.

Key Features:

• Variant Cataloging: The database annotates and stores 2103 mutation variants of germinal origin, including single nucleotide substitutions (SNVs) and insertions/deletions (INDELs).
• Variant Classification: Variants are categorized as nonsense (34%), indels (34%), splice-site (22%), and missense (10%).
• Protein Domain Correlation: Variants are mapped to pRB functional domains, with the Pocket domain (the E2F transcription factor binding site) being the most frequent location of mutations.
• Clinical Correlation: The database correlates variant types and locations with clinical presentation, distinguishing between bilateral and unilateral hereditary retinoblastoma.
• Splice-site Analysis: The database identifies the first nucleotide of the donor splice-site as the most mutated position in consensus sequences.

Scientific Applications:

• Retinoblastoma Genotype-Phenotype Studies: Researchers use the database to analyze the frequency and distribution of RB1 variants in relation to pRB domains and clinical presentation.
• Variant Pathogenicity Assessment: The database enables comparison of variant types between bilateral and unilateral hereditary retinoblastoma, revealing that nonsense variants occur more frequently in bilateral cases while missense variants are more frequent in unilateral hereditary cases.
• Protein Function Investigation: The database supports analysis of how mutations affect the Pocket domain, the major functional site for pRB regulatory processes.

Methodology:

The database was constructed by analyzing SNVs and INDELs of germinal origin annotated in RB1-LOVD, examining their frequency, correlation with pRB functional domains, and association with clinical presentation in bilateral versus unilateral hereditary retinoblastoma cases.