| Gene | Description | Location | Gene Omim Number | Disease Omim Number |
| BCKDHA | BRANCHED-CHAIN KETO ACID DEHYDROGENASE E1, ALPHA POLYPEPTIDE; BCKDHA | 19q13.1-q13.2 | 608348 | 608348 |
| BRAT1 | BRCA1-ASSOCIATED ATM ACTIVATOR 1; BRAT1 | 7p22.3 | 614506 | 614506 |
| BRCA1 | BREAST CANCER 1 GENE; BRCA1 | 17q21.31 | 113705 | 113705 |
| BRCA2 | BRCA2 GENE; BRCA2 | 13q13.1 | 600185 | 600185 |
| BTK | BRUTON AGAMMAGLOBULINEMIA TYROSINE KINASE; BTK | Xq22.1 | 300300 | 300300 |
| BUB1B | BUB1 MITOTIC CHECKPOINT SERINE/THREONINE KINASE B; BUB1B | 15q15 | 602860 | 602860 |