Section 1: Gene Identifiers
| Attribute | Value |
|---|
| HGNC ID | HGNC:9884 |
| Approved Symbol | RB1 |
| Approved Name | RB transcriptional corepressor 1 |
| Previous Names | Retinoblastoma 1, Osteosarcoma |
| Previous Symbols | OSRC |
| Aliases | RB, PPP1R130, pRb |
| Locus Type | Gene with protein product |
| Locus Group | Protein-coding gene |
| Status | Approved |
| Ensembl Gene ID | ENSG00000139687 |
| NCBI Entrez Gene ID | 5925 |
| OMIM ID | 614041 |
| Chromosome | 13 |
| Cytogenetic Location | 13q14.2 |
| Start Position | 48,303,735 (GRCh38) |
| End Position | 48,599,436 (GRCh38) |
| Strand | + (Plus/Forward) |
| Gene Span | 295,701 bp |
Section 2: Transcript Identifiers
Ensembl Transcripts (Total: 17)
| Transcript ID | Biotype | Start | End | UTR5 | UTR3 |
|---|
| ENST00000267163 | protein_coding | 48,303,751 | 48,481,890 | 48,303,751-48,303,912 | 48,480,072-48,481,890 |
| ENST00000467505 | nonsense_mediated_decay | 48,303,775 | 48,481,890 | 48,303,775-48,303,912 | 48,479,998-48,481,890 |
| ENST00000480491 | protein_coding_CDS_not_defined | 48,444,828 | 48,456,307 | - | - |
| ENST00000484879 | retained_intron | 48,476,447 | 48,480,647 | - | - |
| ENST00000525036 | retained_intron | 48,303,751 | 48,360,737 | - | - |
| ENST00000531171 | protein_coding_CDS_not_defined | 48,476,400 | 48,480,339 | - | - |
| ENST00000643064 | protein_coding | 48,381,250 | 48,599,436 | - | - |
| ENST00000646097 | protein_coding | 48,303,744 | 48,333,216 | 48,303,744-48,303,912 | 48,333,065-48,333,216 |
| ENST00000650461 | protein_coding | 48,303,747 | 48,481,728 | 48,303,747-48,303,912 | 48,480,038-48,481,728 |
| ENST00000713856 | protein_coding | 48,303,755 | 48,481,429 | 48,303,755-48,303,912 | 48,480,034-48,481,429 |
| ENST00000713857 | protein_coding | 48,303,847 | 48,481,875 | 48,303,847-48,303,912 | 48,480,072-48,481,875 |
| ENST00000713858 | protein_coding | 48,303,847 | 48,481,875 | 48,303,847-48,303,912 | 48,480,072-48,481,875 |
| ENST00000713859 | nonsense_mediated_decay | 48,303,875 | 48,481,883 | 48,303,875-48,303,912 | 48,479,998-48,481,883 |
| ENST00000859510 | protein_coding | 48,303,751 | 48,481,890 | 48,303,751-48,303,912 | 48,480,072-48,481,890 |
| ENST00000859511 | protein_coding | 48,303,778 | 48,481,886 | 48,303,778-48,303,912 | 48,480,072-48,481,886 |
| ENST00000924352 | protein_coding | 48,303,735 | 48,481,886 | 48,303,735-48,303,912 | 48,480,072-48,481,886 |
| ENST00000941076 | protein_coding | 48,303,769 | 48,481,885 | 48,303,769-48,303,912 | 48,480,072-48,481,885 |
RefSeq Transcripts - Human (Chromosome 13)
| RefSeq ID | Type | Status | MANE Select |
|---|
| NM_000321 | mRNA | REVIEWED | ✓ Yes |
| NM_001407165 | mRNA | REVIEWED | No |
| NM_001407166 | mRNA | REVIEWED | No |
| NM_001407167 | mRNA | REVIEWED | No |
| NM_001407168 | mRNA | REVIEWED | No |
CCDS ID
| ID | Description |
|---|
| CCDS31973 | Consensus CDS for RB1 |
Canonical Transcript (ENST00000267163) Exons - Total: 27 exons
| Exon ID | Start | End | Length |
|---|
| ENSE00003816215 | 48,303,751 | 48,304,049 | 298 bp |
| ENSE00003469272 | 48,307,280 | 48,307,406 | 126 bp |
| ENSE00003588059 | 48,342,599 | 48,342,714 | 115 bp |
| ENSE00003494338 | 48,345,080 | 48,345,199 | 119 bp |
| ENSE00003621237 | 48,347,825 | 48,347,863 | 38 bp |
| ENSE00003474733 | 48,348,956 | 48,349,023 | 67 bp |
| ENSE00003461315 | 48,360,017 | 48,360,127 | 110 bp |
| ENSE00000939670 | 48,362,815 | 48,362,957 | 142 bp |
| ENSE00000939671 | 48,364,894 | 48,364,971 | 77 bp |
| ENSE00000939672 | 48,367,494 | 48,367,603 | 109 bp |
| ENSE00000939673 | 48,368,527 | 48,368,604 | 77 bp |
| ENSE00000939674 | 48,373,405 | 48,373,492 | 87 bp |
| ENSE00000939675 | 48,376,918 | 48,377,034 | 116 bp |
| ENSE00000939676 | 48,379,594 | 48,379,650 | 56 bp |
| ENSE00000939677 | 48,380,053 | 48,380,084 | 31 bp |
| ENSE00000939678 | 48,380,165 | 48,380,241 | 76 bp |
| ENSE00000939679 | 48,381,247 | 48,381,443 | 196 bp |
| ENSE00003599424 | 48,452,993 | 48,453,111 | 118 bp |
| ENSE00000939681 | 48,456,204 | 48,456,349 | 145 bp |
| ENSE00000939682 | 48,459,688 | 48,459,833 | 145 bp |
| ENSE00000939683 | 48,463,731 | 48,463,835 | 104 bp |
| ENSE00000939684 | 48,464,998 | 48,465,111 | 113 bp |
| ENSE00000939685 | 48,465,205 | 48,465,368 | 163 bp |
| ENSE00001003962 | 48,473,360 | 48,473,390 | 30 bp |
| ENSE00003541600 | 48,476,701 | 48,476,843 | 142 bp |
| ENSE00003641827 | 48,477,355 | 48,477,404 | 49 bp |
| ENSE00001241067 | 48,479,998 | 48,481,890 | 1,892 bp |
Section 3: Protein Identifiers
UniProt Entries
| UniProt ID | Name | Status | Length | Mass |
|---|
| P06400 | Retinoblastoma-associated protein | ✓ Canonical/Reviewed | 928 aa | 106,159 Da |
Alternative Names: p105-Rb, p110-RB1, pRb, pp110
RefSeq Protein Accessions (Human)
| RefSeq Protein ID | Status | MANE Select |
|---|
| NP_000312 | REVIEWED | ✓ Yes |
| NP_001394094 | REVIEWED | No |
| NP_001394095 | REVIEWED | No |
| NP_001394096 | REVIEWED | No |
| NP_001394097 | REVIEWED | No |
Protein Domains and Families (Total: 7)
| Domain/Family ID | Name | Type |
|---|
| IPR002719 | RB_B | Domain |
| IPR002720 | RB_A | Domain |
| IPR013763 | Cyclin-like_dom | Domain |
| IPR015030 | RB_C | Domain |
| IPR024599 | RB_N | Domain |
| IPR028309 | RB_fam | Family |
| IPR036915 | Cyclin-like_sf | Homologous_superfamily |
Section 4: Structure Identifiers
Experimental Structures (Total: 19 PDB structures)
| PDB ID | Title | Method | Resolution |
|---|
| 1AD6 | Domain A of human retinoblastoma tumor suppressor | X-ray | 2.30 Å |
| 1GH6 | Retinoblastoma pocket complexed with SV40 large T antigen | X-ray | 3.20 Å |
| 1GUX | RB pocket bound to E7 LXCXE motif | X-ray | 1.85 Å |
| 1H25 | CDK2/Cyclin A in complex with 11-residue recruitment peptide from Rb | X-ray | 2.50 Å |
| 1N4M | Structure of Rb bound to transactivation domain of E2F-2 | X-ray | 2.20 Å |
| 1O9K | Crystal structure of Rb bound to E2F peptide | X-ray | 2.60 Å |
| 1PJM | Mouse Importin alpha-bipartite NLS from human Rb complex | X-ray | 2.50 Å |
| 2AZE | Structure of Rb C-terminal domain bound to E2F1-DP1 heterodimer | X-ray | 2.55 Å |
| 2QDJ | Crystal structure of Rb N-domain | X-ray | 2.00 Å |
| 2R7G | Structure of Rb pocket domain with adenovirus E1A CR1 domain | X-ray | 1.67 Å |
| 3N5U | Crystal structure of Rb C-terminal peptide bound to PP1 | X-ray | 3.20 Å |
| 3POM | Crystal structure of unliganded Rb pocket domain | X-ray | 2.50 Å |
| 4CRI | Crystal structure of 53BP1 tudor domains with methylated K810 Rb peptide | X-ray | 2.35 Å |
| 4ELJ | Crystal structure of inactive Rb phosphorylated at T373 | X-ray | 2.70 Å |
| 4ELL | Structure of inactive Rb pocket domain | X-ray | 1.98 Å |
| 9DGK | Rb with mutation M704V | X-ray | 2.38 Å |
| 9DHC | Rb with mutation S751Y | X-ray | 2.32 Å |
| 9DHF | Rb with mutation E554K | X-ray | 2.26 Å |
| 9DHU | Rb with mutation E533K | X-ray | 2.16 Å |
Predicted Structures
| AlphaFold ID | Global pLDDT | Sequence Length | Fraction Very High Confidence |
|---|
| AF-P06400 | 77.03 | 7,455 residues | 53% |
Section 5: Cross-Species Orthologs
| Organism | Gene ID | Symbol | Biotype |
|---|
| Mouse (Mus musculus) | ENSMUSG00000022105 | Rb1 | protein_coding |
| Rat (Rattus norvegicus) | ENSRNOG00000016029 | Rb1 | protein_coding |
| Zebrafish (Danio rerio) | ENSDARG00000006782 | rb1 | protein_coding |
| Fruit fly (Drosophila melanogaster) | FBGN0015799 | Rbf | protein_coding |
| Fruit fly (D. melanogaster) | FBGN0038390 | Rbf2 | protein_coding |
| Worm (C. elegans) | WBGENE00003020 | lin-35 | protein_coding |
| Yeast (S. cerevisiae) | No ortholog identified | - | - |
Section 6: Clinical Variants & AI Predictions
ClinVar Variant Summary (Total: 4,340 variants)
| Classification | Count |
|---|
| Pathogenic | >100 |
| Likely Pathogenic | 91 |
| Uncertain Significance (VUS) | >100 |
| Likely Benign | >100 |
| Benign | >100 |
TOP 50 Pathogenic/Likely Pathogenic Variants
| Variant ID | HGVS Notation | Classification | Type |
|---|
| 100808 | c.1960G>A (p.Val654Met) | Pathogenic | SNV |
| 126784 | c.1723C>T (p.Gln575Ter) | Pathogenic | SNV |
| 126785 | c.1735C>T (p.Arg579Ter) | Pathogenic | SNV |
| 126788 | c.1909C>T (p.Gln637Ter) | Pathogenic | SNV |
| 126820 | c.763C>T (p.Arg255Ter) | Pathogenic | SNV |
| 126824 | c.958C>T (p.Arg320Ter) | Pathogenic | SNV |
| 126832 | c.1215+1G>A | Pathogenic | Splice |
| 126834 | c.1332+1G>A | Pathogenic | Splice |
| 126837 | c.1363C>T (p.Arg455Ter) | Pathogenic | SNV |
| 126840 | c.1654C>T (p.Arg552Ter) | Pathogenic | SNV |
| 1069507 | c.2236G>T (p.Glu746Ter) | Pathogenic | SNV |
| 1071424 | c.1597G>T (p.Glu533Ter) | Pathogenic | SNV |
| 1071425 | c.1332G>A (p.Gln444=) | Pathogenic | Silent/Splice |
| 1071426 | c.1422-2A>G | Pathogenic | Splice |
| 1073217 | c.19del (p.Arg7fs) | Pathogenic | Frameshift |
| 1073218 | c.62dup (p.Ala22fs) | Pathogenic | Frameshift |
| 1074237 | c.2420C>G (p.Ser807Ter) | Pathogenic | SNV |
| 1075933 | c.191T>G (p.Leu64Ter) | Pathogenic | SNV |
| 1076189 | c.377del (p.Ile126fs) | Pathogenic | Frameshift |
| 126818 | c.103C>T (p.Gln35Ter) | Pathogenic | SNV |
| 126810 | c.409G>T (p.Glu137Ter) | Pathogenic | SNV |
| 126812 | c.446C>G (p.Ser149Ter) | Pathogenic | SNV |
| 126814 | c.508G>T (p.Glu170Ter) | Pathogenic | SNV |
| 126844 | c.219_220del (p.Arg73fs) | Pathogenic | Frameshift |
| 126828 | c.1060_1061del (p.Gln354fs) | Pathogenic | Frameshift |
| 13069 | c.2520+1del | Pathogenic | Splice |
| 126805 | c.2520+1G>A | Pathogenic | Splice |
| 1037460 | c.1589A>G (p.Lys530Arg) | Pathogenic/Likely pathogenic | Missense |
| 1004646 | c.264+5G>A | Likely pathogenic | Splice |
| 13072 | c.1700C>T (p.Ser567Leu) | Likely pathogenic | Missense |
| 13085 | c.-189G>T | Likely pathogenic | 5'UTR |
| 126791 | c.1960+5G>A | Likely pathogenic | Splice |
| 126799 | c.2212-13T>A | Likely pathogenic | Splice |
| 126836 | c.1346G>T (p.Gly449Val) | Likely pathogenic | Missense |
| 3787240 | c.1A>G (p.Met1Val) | Likely pathogenic | Start loss |
| 579207 | c.539+1G>A | Likely pathogenic | Splice |
| 495820 | c.1421G>T (p.Ser474Ile) | Likely pathogenic | Missense |
| 2736025 | c.1215+5G>A | Likely pathogenic | Splice |
| 3237051 | c.1970T>C (p.Leu657Pro) | Likely pathogenic | Missense |
| 3237052 | c.1985T>C (p.Leu662Pro) | Likely pathogenic | Missense |
| 3237063 | c.2104C>A (p.Gln702Lys) | Likely pathogenic | Missense |
| 1698763 | c.2279T>C (p.Phe760Ser) | Likely pathogenic | Missense |
| 2858090 | c.2084T>A (p.Met695Lys) | Likely pathogenic | Missense |
| 3237102 | c.2490-28T>C | Likely pathogenic | Splice |
| 949856 | c.2520+4A>G | Likely pathogenic | Splice |
| 572140 | c.652T>G (p.Leu218Val) | Likely pathogenic | Missense |
| 635474 | c.1696-2A>G | Likely pathogenic | Splice |
| 1067622 | c.1199T>C (p.Leu400Pro) | Likely pathogenic | Missense |
| 1064436 | c.1331A>C (p.Gln444Pro) | Likely pathogenic | Missense |
| 3663254 | c.2663G>C (p.Ser888Thr) | Likely pathogenic | Missense |
AI-Based Splice Effect Predictions (SpliceAI)
Total predictions: 6,247 variants
TOP 50 Predicted Splice-Altering Variants:
| Variant | Effect | Delta Score |
|---|
| 13:48304045:GTCAG:G | donor_gain | 1.00 |
| 13:48304050:GTG:G | donor_loss | 1.00 |
| 13:48304050:G:GG | donor_gain | 0.99 |
| 13:48304046:TCAG:T | donor_gain | 0.95 |
| 13:48304569:GGTCC:G | donor_gain | 0.95 |
| 13:48304570:GTCC:G | donor_gain | 0.94 |
| 13:48304571:TCCT:T | donor_gain | 0.94 |
| 13:48304485:G:GT | donor_gain | 0.91 |
| 13:48304083:G:T | donor_gain | 0.87 |
| 13:48304741:G:GT | donor_gain | 0.86 |
| 13:48304485:G:T | donor_gain | 0.86 |
| 13:48304481:TTGGG:T | donor_gain | 0.84 |
| 13:48304048:AG:A | donor_gain | 0.83 |
| 13:48304049:GG:G | donor_gain | 0.83 |
| 13:48304671:T:TA | donor_gain | 0.82 |
| 13:48304672:A:AA | donor_gain | 0.82 |
| 13:48304083:G:GT | donor_gain | 0.78 |
| 13:48304218:A:AG | donor_gain | 0.78 |
| 13:48304222:GATTC:G | donor_gain | 0.76 |
| 13:48304684:A:T | donor_gain | 0.76 |
| 13:48304608:G:GT | donor_gain | 0.74 |
| 13:48304217:GAC:G | donor_gain | 0.72 |
| 13:48304594:GA:G | donor_gain | 0.71 |
| 13:48304441:G:GA | donor_gain | 0.71 |
| 13:48304470:C:CA | acceptor_gain | 0.70 |
| 13:48304018:G:GT | donor_gain | 0.67 |
| 13:48304219:C:G | donor_gain | 0.66 |
| 13:48304560:G:GT | donor_gain | 0.66 |
| 13:48304701:G:GT | donor_gain | 0.66 |
| 13:48304572:CCTG:C | donor_gain | 0.65 |
AI-Based Missense Pathogenicity Predictions (AlphaMissense)
Total predictions: 6,110 variants
TOP 50 Predicted Pathogenic Missense Variants:
| Variant | Protein Change | AM Score | Classification |
|---|
| 13:48303924:A:C | K4N | 0.673 | likely_pathogenic |
| 13:48303924:A:T | K4N | 0.673 | likely_pathogenic |
| 13:48303932:G:A | R7Q | 0.584 | likely_pathogenic |
Note: Most N-terminal variants show likely_benign or ambiguous classifications. Higher pathogenicity scores are observed in the pocket domain regions (positions 379-792).
Section 7: Biological Pathways & Gene Ontology
Reactome Pathways (Total: 18)
| Pathway ID | Pathway Name | Disease Pathway |
|---|
| R-HSA-69231 | Cyclin D associated events in G1 | No |
| R-HSA-69200 | Phosphorylation of proteins involved in G1/S transition by active Cyclin E:Cdk2 complexes | No |
| R-HSA-69202 | Cyclin E associated events during G1/S transition | No |
| R-HSA-69656 | Cyclin A:Cdk2-associated events at S phase entry | No |
| R-HSA-113501 | Inhibition of replication initiation of damaged DNA by RB1/E2F1 | No |
| R-HSA-174178 | APC/C:Cdh1 mediated degradation of Cdc20 and other APC/C:Cdh1 targeted proteins in late mitosis/early G1 | No |
| R-HSA-2299718 | Condensation of Prophase Chromosomes | No |
| R-HSA-2559584 | Formation of Senescence-Associated Heterochromatin Foci (SAHF) | No |
| R-HSA-2559585 | Oncogene Induced Senescence | No |
| R-HSA-8940973 | RUNX2 regulates osteoblast differentiation | No |
| R-HSA-9764790 | Positive Regulation of CDH1 Gene Transcription | No |
| R-HSA-9841922 | MLL4 and MLL3 complexes regulate expression of PPARG target genes | No |
| R-HSA-9661069 | Defective binding of RB1 mutants to E2F1,(E2F2, E2F3) | Yes |
| R-HSA-9661070 | Defective translocation of RB1 mutants to the nucleus | Yes |
| R-HSA-9687136 | Aberrant regulation of mitotic exit in cancer due to RB1 defects | Yes |
| R-HSA-9682706 | Replication of the SARS-CoV-1 genome | Yes |
| R-HSA-9694686 | Replication of the SARS-CoV-2 genome | Yes |
| R-HSA-9725371 | Nuclear events stimulated by ALK signaling in cancer | Yes |
Gene Ontology Annotations (Total: 77)
Biological Process (47 terms) - TOP 20:
| GO ID | Term Name |
|---|
| GO:0000082 | G1/S transition of mitotic cell cycle |
| GO:0000122 | Negative regulation of transcription by RNA polymerase II |
| GO:0006338 | Chromatin remodeling |
| GO:0006355 | Regulation of DNA-templated transcription |
| GO:0006366 | Transcription by RNA polymerase II |
| GO:0006469 | Negative regulation of protein kinase activity |
| GO:0007346 | Regulation of mitotic cell cycle |
| GO:0030154 | Cell differentiation |
| GO:0030308 | Negative regulation of cell growth |
| GO:0031507 | Heterochromatin formation |
| GO:0034088 | Maintenance of mitotic sister chromatid cohesion |
| GO:0045786 | Negative regulation of cell cycle |
| GO:0045892 | Negative regulation of DNA-templated transcription |
| GO:0045944 | Positive regulation of transcription by RNA polymerase II |
| GO:0051276 | Chromosome organization |
| GO:0051301 | Cell division |
| GO:0051726 | Regulation of cell cycle |
| GO:0007283 | Spermatogenesis |
| GO:0002062 | Chondrocyte differentiation |
| GO:2000134 | Negative regulation of G1/S transition of mitotic cell cycle |
Molecular Function (14 terms) - ALL:
| GO ID | Term Name |
|---|
| GO:0000977 | RNA polymerase II transcription regulatory region sequence-specific DNA binding |
| GO:0003714 | Transcription corepressor activity |
| GO:0019900 | Kinase binding |
| GO:0031625 | Ubiquitin protein ligase binding |
| GO:0042802 | Identical protein binding |
| GO:0051219 | Phosphoprotein binding |
| GO:0060090 | Molecular adaptor activity |
| GO:0061629 | RNA polymerase II-specific DNA-binding transcription factor binding |
| GO:0061676 | Importin-alpha family protein binding |
| GO:0097718 | Disordered domain specific binding |
| GO:0140297 | DNA-binding transcription factor binding |
Cellular Component (10 terms) - ALL:
| GO ID | Term Name |
|---|
| GO:0000785 | Chromatin |
| GO:0005634 | Nucleus |
| GO:0005654 | Nucleoplasm |
| GO:0005737 | Cytoplasm |
| GO:0005819 | Spindle |
| GO:0005829 | Cytosol |
| GO:0016514 | SWI/SNF complex |
| GO:0016605 | PML body |
| GO:0035189 | Rb-E2F complex |
| GO:0061793 | Chromatin lock complex |
Section 8: Protein Interactions & Molecular Networks
Protein-Protein Interactions
| Database | Interaction Count |
|---|
| STRING | 2,743 interactions |
| IntAct | 473 interactions |
| BioGRID | 1,154 interactions |
TOP 50 Highest-Confidence Interacting Proteins (STRING)
| UniProt ID | Gene | Score | Function |
|---|
| Q01094 | E2F1 | 996 | Transcription factor |
| P11802 | CDK4 | 985 | Cyclin-dependent kinase 4 |
| Q13547 | HDAC1 | 962 | Histone deacetylase 1 |
| Q00987 | MDM2 | 925 | E3 ubiquitin-protein ligase |
| P06703 | S100A6 | 921 | Calcium-binding protein |
| P20248 | CCNA2 | 911 | Cyclin A2 |
| P78396 | CCNA1 | 908 | Cyclin A1 |
| O00716 | E2F3 | 897 | Transcription factor |
| Q16254 | E2F4 | 884 | Transcription factor |
| P04637 | TP53 | 873 | Tumor protein p53 |
| Q96S94 | CCNC | 853 | Cyclin C |
| P42771 | CDKN2A | 842 | p16-INK4a/p14-ARF |
| Q00534 | CDK6 | 841 | Cyclin-dependent kinase 6 |
| P24385 | CCND1 | 831 | Cyclin D1 |
| P24941 | CDK2 | 821 | Cyclin-dependent kinase 2 |
| Q13950 | RUNX2 | 816 | Runt-related transcription factor 2 |
| Q04118 | PRB3 | 809 | Proline-rich protein 3 |
| P04280 | PRB1 | 786 | Proline-rich protein 1 |
| P02813 | STATH | 780 | Statherin |
| P06401 | PGR | 769 | Progesterone receptor |
| P29375 | LTF | 763 | Lactotransferrin |
| Q14209 | E2F2 | 756 | Transcription factor |
| Q5TKA1 | LIN9 | 740 | Protein lin-9 homolog |
| P01106 | MYC | 736 | Myc proto-oncogene protein |
| P06493 | CDK1 | 731 | Cyclin-dependent kinase 1 |
| P60484 | PTEN | 715 | Phosphatidylinositol 3,4,5-trisphosphate 3-phosphatase |
| P30281 | CCND3 | 712 | Cyclin D3 |
| P02810 | PRB2 | 699 | Proline-rich protein 2 |
| Q13309 | SKP2 | 696 | S-phase kinase-associated protein 2 |
| P49326 | CST4 | 688 | Cystatin S |
| Q15910 | EZH2 | 687 | Enhancer of zeste homolog 2 |
| P29374 | RAR-related orphan receptor A | 680 | Nuclear receptor |
| Q9NYW8 | RBBP7 | 662 | RB binding protein 7 |
| P38936 | CDKN1A | 658 | p21/WAF1/CIP1 |
| P39880 | CUX1 | 644 | Homeobox protein cut-like 1 |
| Q96PU4 | UHRF2 | 639 | E3 ubiquitin-protein ligase |
| Q16666 | IFI16 | 630 | Interferon gamma inducible protein 16 |
| P46527 | CDKN1B | 627 | p27/KIP1 |
| P31149 | RAG1 | 611 | V(D)J recombination-activating protein 1 |
| Q9BT92 | UHRF1 | 607 | E3 ubiquitin-protein ligase |
| Q86Y97 | MRPL54 | 604 | Mitochondrial ribosomal protein |
| P12931 | SRC | 591 | Proto-oncogene tyrosine-protein kinase Src |
| Q15022 | SUZ12 | 587 | Polycomb protein SUZ12 |
| Q15329 | E2F5 | 587 | Transcription factor |
| P24864 | CCNE1 | 584 | Cyclin E1 |
| P03372 | ESR1 | 577 | Estrogen receptor |
| P31749 | AKT1 | 577 | RAC-alpha serine/threonine-protein kinase |
| O43463 | SUV39H1 | 568 | Histone-lysine N-methyltransferase |
Protein Structural/Embedding Similarity (ESM2)
Total similar proteins: 46
TOP 20:
| UniProt ID | Similarity Score | Organism |
|---|
| A2YXJ7 | 1.0000 | Mammal |
| Q84QM3 | 1.0000 | Plant |
| P13405 | 0.9999 | Mouse (Rb1) |
| P33568 | 0.9999 | Rat (Rb1) |
| A9UL14 | 0.9997 | Mammal |
| Q8H0J6 | 0.9997 | Plant |
| Q9LKX9 | 0.9997 | Plant |
| Q9SLZ4 | 0.9997 | Plant |
| B9GLX8 | 0.9996 | Mammal |
| B9SVG9 | 0.9996 | Mammal |
| A9UL13 | 0.9995 | Mammal |
| A7P514 | 0.9995 | Mammal |
| Q32N22 | 0.9995 | Mammal |
| Q3LXA7 | 0.9995 | Mammal |
| F7BLM1 | 0.9995 | Mammal |
| Q4JF75 | 0.9994 | Mammal |
| Q66WV0 | 0.9994 | Mammal |
| Q9LKZ3 | 0.9994 | Plant |
| Q8H252 | 0.9993 | Plant |
| Q9SXN6 | 0.9992 | Plant |
Sequence Homology (DIAMOND)
| UniProt ID | Protein Name | Identity | Bitscore |
|---|
| P13405 | Mouse Rb1 | 95.3% | 1677 |
| P33568 | Rat Rb1 | 95.3% | 1681 |
| Q90600 | Chicken Rb | 74.8% | 1291 |
Section 9: Transcription Factor Regulatory Data
RB1 as a Transcriptional Regulator
RB1 functions as a transcriptional corepressor, primarily through interaction with E2F family transcription factors.
Total CollecTRI regulatory interactions: 114
Downstream Targets (Genes Regulated BY RB1) - TOP 35:
| Target Gene | Regulation | Confidence |
|---|
| E2F1 | Repression | High |
| E2F2 | Repression | High |
| E2F3 | Repression | High |
| MYC | Repression | Medium |
| BRCA1 | Repression | Medium |
| DHFR | Repression | Medium |
| DNMT3A | Repression | Medium |
| FGFR1 | Repression | Medium |
| FOS | Repression | Medium |
| PCNA | Repression | Medium |
| RBL1 | Repression | Medium |
| TFDP1 | Repression | Medium |
| RB1 | Repression (autoregulation) | Medium |
| BIRC5 | Unknown | Medium |
| CDH1 | Unknown | Medium |
| CDK1 | Unknown | Medium |
| CDKN1A | Activation | Medium |
| VEGFA | Activation | Medium |
| SFTPD | Activation | Medium |
| ITGA10 | Activation | Medium |
| EBNA1BP2 | Activation | Medium |
| H1-5 | Activation | High |
Upstream Regulators (TFs that Regulate RB1) - TOP 50:
| TF Gene | Regulation | Confidence |
|---|
| E2F1 | Activation | High |
| E2F3 | - | High |
| E2F4 | Unknown | High |
| SP1 | Unknown | High |
| FOS | Activation | High |
| MYOD1 | Activation | High |
| CTCF | - | High |
| AP1 | Unknown | High |
| EGR1 | Unknown | High |
| CREB1 | Unknown | High |
| BCL3 | - | High |
| CEBPB | - | High |
| CXXC1 | - | High |
| FLI1 | - | High |
| GRHL3 | - | High |
| GTF2IRD1 | - | High |
| HBP1 | - | High |
| HES1 | - | High |
| HINFP | - | High |
| HMGA1 | - | High |
| JARID2 | - | High |
| NCOR1 | - | High |
| PAX5 | Unknown | High |
| PAX6 | - | High |
| SON | - | High |
| SPI1 | - | High |
| TAF1 | - | High |
| TBP | - | High |
| DNMT1 | Repression | High |
| DNMT3A | - | High |
| ARID4A | Repression | High |
| KAT2B | Activation | Medium |
| PGR | Activation | Medium |
| RB1CC1 | Activation | Medium |
| STAT3 | Repression | Low |
| SMAD6 | Repression | Medium |
| CTNNB1 | Repression | Medium |
DNA Binding Profiles
RB1 does not directly bind DNA; it functions as a transcriptional corepressor by binding to E2F family transcription factors and recruiting chromatin-modifying complexes (HDACs, SUV39H1, etc.).
Section 10: Drug & Pharmacology Data
ChEMBL Targets
| Target ID | Target Name | Type |
|---|
| CHEMBL5288 | Retinoblastoma-associated protein | SINGLE PROTEIN |
| CHEMBL4523682 | Protein cereblon/Retinoblastoma-associated protein | PROTEIN-PROTEIN INTERACTION |
Targeting Molecules (Total: 25)
| ChEMBL ID | Name | Type | Highest Phase |
|---|
| CHEMBL4446357 | EBVACICLIB | Small molecule | Phase 2 |
| CHEMBL388978 | STAUROSPORINE | Small molecule | Phase 0 |
| CHEMBL490451 | - | Small molecule | Phase 0 |
| CHEMBL504547 | - | Small molecule | Phase 0 |
| CHEMBL515631 | - | Small molecule | Phase 0 |
| CHEMBL4060594-CHEMBL4093413 | Various compounds | Small molecule | Phase 0 |
Note: Most compounds targeting RB1 are in preclinical development. Ebvaciclib (Phase 2) works by inhibiting CDK4/6, which indirectly affects RB1 phosphorylation status.
PharmGKB
| ID | VIP Gene | CPIC Guideline |
|---|
| PA295 | Yes (Very Important Pharmacogene) | No |
Pharmacogenomics
RB1 is classified as a VIP (Very Important Pharmacogene) due to its role in cancer biology and response to CDK4/6 inhibitors (palbociclib, ribociclib, abemaciclib) which function by maintaining RB1
in its active (hypophosphorylated) tumor-suppressive state.
Section 11: Expression Profiles
Expression Summary (Bgee)
| Attribute | Value |
|---|
| Expression Breadth | Ubiquitous |
| Total Present Calls | 287 |
| Max Expression Score | 97.39 |
TOP 30 Tissues by Expression Score
| Tissue/Anatomical Entity | Expression Score | Quality |
|---|
| Epithelium of nasopharynx | 97.39 | Gold |
| Choroid plexus epithelium | 97.16 | Gold |
| Visceral pleura | 96.50 | Gold |
| Germinal epithelium of ovary | 96.24 | Gold |
| Gingival epithelium | 96.09 | Gold |
| Pleura | 95.70 | Gold |
| Palpebral conjunctiva | 95.70 | Gold |
| Parietal pleura | 95.67 | Gold |
| Seminal vesicle | 95.58 | Gold |
| Eye | 94.91 | Gold |
| Mucosa of paranasal sinus | 94.83 | Gold |
| Brodmann area 23 | 94.77 | Gold |
| Gingiva | 94.07 | Gold |
| Trabecular bone tissue | 94.05 | Gold |
| Jejunal mucosa | 94.03 | Gold |
| Jejunum | 94.03 | Gold |
| Tibia | 93.98 | Gold |
| Superficial temporal artery | 93.79 | Gold |
| Caput epididymis | 93.77 | Gold |
| Corpus epididymis | 93.77 | Gold |
| Tonsil | 93.64 | Gold |
| Endometrium | 93.42 | Gold |
| Cauda epididymis | 93.40 | Gold |
| Adrenal tissue | 93.36 | Gold |
| Trigeminal ganglion | 93.28 | Gold |
| Ventricular zone | 93.03 | Gold |
| Synovial joint | 92.98 | Gold |
| Lower lobe of lung | 92.75 | Gold |
| Penis | 92.72 | Gold |
| Mammary duct | 92.69 | Gold |
TOP 30 Cell Types by Expression
| Cell Type | Expression Score | Quality |
|---|
| Monocyte | 93.95 | Gold |
| Mononuclear cell | 93.67 | Gold |
| Endothelial cell | 93.65 | Gold |
| Leukocyte | 93.19 | Gold |
| Bone marrow cell | 91.25 | Gold |
| Bronchial epithelial cell | 91.04 | Gold |
| Stromal cell of endometrium | 89.61 | Gold |
Single-Cell Expression Data
| Dataset ID | Description | Species | Cell Count |
|---|
| E-ANND-5 | Mapping the developing human immune system across organs | Homo sapiens | 911,873 |
| E-MTAB-9906 | scRNA-seq of human fetal intestinal ileum tissue | Homo sapiens | 21,097 |
Section 12: Disease Associations
Mendelian/Monogenic Disease Links (GenCC)
| Disease | Disease ID | Classification | Inheritance | Submitter |
|---|
| Hereditary retinoblastoma | OMIM:180200 | Definitive | Autosomal dominant | Ambry Genetics |
| Hereditary retinoblastoma | OMIM:180200 | Definitive | Autosomal dominant | G2P |
| Hereditary retinoblastoma | OMIM:180200 | Strong | Autosomal dominant | Labcorp Genetics |
| Hereditary retinoblastoma | ORPHANET:357027 | Supportive | Autosomal dominant | Orphanet |
| Melanoma | MONDO:0005105 | Moderate | Autosomal dominant | Ambry Genetics |
Orphanet Disease Associations (Total: 5)
| Orphanet ID | Disease Name | Type | Gene Count |
|---|
| ORPHA:357027 | Hereditary retinoblastoma | Clinical subtype | 2 |
| ORPHA:357034 | Non-hereditary retinoblastoma | Clinical subtype | 2 |
| ORPHA:1587 | Monosomy 13q14 syndrome | Malformation syndrome | 1 |
| ORPHA:668 | Osteosarcoma | Disease | 4 |
| ORPHA:70573 | Small cell lung cancer | Disease | 3 |
Phenotype Associations (HPO) - Total: 58 terms
| HPO ID | Phenotype |
|---|
| HP:0009919 | Retinoblastoma |
| HP:0002669 | Osteosarcoma |
| HP:0000555 | Leukocoria |
| HP:0000518 | Cataract |
| HP:0000568 | Microphthalmia |
| HP:0000612 | Iris coloboma |
| HP:0007862 | Retinal calcification |
| HP:0007902 | Vitreous hemorrhage |
| HP:0011531 | Vitritis |
| HP:0010799 | Pinealoma |
| HP:0006740 | Transitional cell carcinoma of the bladder |
| HP:0009725 | Bladder neoplasm |
| HP:0100526 | Neoplasm of the lung |
| HP:0012254 | Ewing sarcoma |
| HP:0001909 | Leukemia |
| HP:0002665 | Lymphoma |
| HP:0001249 | Intellectual disability |
| HP:0000252 | Microcephaly |
| HP:0001360 | Holoprosencephaly |
| HP:0002079 | Hypoplasia of the corpus callosum |
| HP:0000243 | Trigonocephaly |
| HP:0000175 | Cleft palate |
| HP:0000347 | Micrognathia |
| HP:0000316 | Hypertelorism |
| HP:0000286 | Epicanthus |
| HP:0000426 | Prominent nasal bridge |
| HP:0000431 | Wide nasal bridge |
| HP:0000508 | Ptosis |
| HP:0000369 | Low-set ears |
| HP:0000391 | Thickened helices |
| HP:0000411 | Protruding ear |
| HP:0000465 | Webbed neck |
| HP:0000470 | Short neck |
| HP:0001156 | Brachydactyly |
| HP:0004209 | Clinodactyly of the 5th finger |
| HP:0006101 | Finger syndactyly |
| HP:0009601 | Aplasia/Hypoplasia of the thumb |
| HP:0004322 | Short stature |
| HP:0001511 | Intrauterine growth retardation |
| HP:0001252 | Hypotonia |
| HP:0000944 | Abnormal metaphysis morphology |
| HP:0006489 | Abnormal femoral metaphysis morphology |
| HP:0006491 | Abnormal tibial metaphysis morphology |
| HP:0002756 | Pathologic fracture |
| HP:0002797 | Osteolysis |
| HP:0001386 | Joint swelling |
| HP:0000006 | Autosomal dominant inheritance |
| HP:0003745 | Sporadic |
| HP:0001442 | Typified by somatic mosaicism |
GWAS Associations (Total: 8)
| Study ID | Trait/Disease | p-value | Mapped Gene(s) |
|---|
| GCST005146_24 | Birth weight | 2×10⁻⁸ | RB1 |
| GCST008362_41 | Birth weight | 7×10⁻¹¹ | ITM2B - RB1-DT |
| GCST90002388_164 | Lymphocyte count | 4×10⁻¹¹ | LPAR6, RB1 |
| GCST008363_106 | Offspring birth weight | 2×10⁻⁷ | ITM2B - RB1-DT |
| GCST012050_1 | Diastolic blood pressure | 2×10⁻⁷ | RB1 |
| GCST003140_5 | Chronic kidney disease | 4×10⁻⁶ | RB1 |
| GCST003264_156 | Post bronchodilator FEV1/FVC ratio | 2×10⁻⁶ | RB1 |
| GCST003264_7 | Post bronchodilator FEV1/FVC ratio | 2×10⁻⁶ | RB1 |
DATA SOURCES
This reference document integrates data from:
- HGNC - HUGO Gene Nomenclature Committee
- Ensembl - Genome browser and annotation
- NCBI Entrez Gene - Gene database
- OMIM - Online Mendelian Inheritance in Man
- UniProt - Protein sequence and functional information
- RefSeq - Reference sequences
- CCDS - Consensus CDS
- PDB - Protein Data Bank
- AlphaFold - Predicted protein structures
- ClinVar - Clinical variant interpretations
- SpliceAI - AI-based splice predictions
- AlphaMissense - AI-based missense predictions
- Reactome - Pathway database
- Gene Ontology - Functional annotations
- STRING - Protein-protein interactions
- IntAct - Molecular interactions
- BioGRID - Biological interactions
- CollecTRI - Transcription factor-target interactions
- ChEMBL - Drug/compound bioactivity
- PharmGKB - Pharmacogenomics
- Bgee - Gene expression
- Single Cell Expression Atlas - scRNA-seq data
- GenCC - Gene-disease clinical validity
- Orphanet - Rare disease database
- HPO - Human Phenotype Ontology
- GWAS Catalog - Genome-wide association studies
Document generated via biobtree cross-database queries. Last updated: March 2026