ARID1B and BAFopathy: Typical CSS, which is also referred to as BAFopathy, is caused by variants in the subunit of BAF complex, including ARID1A (OMIM#603024), ARID1B (OMIM#614556), SMARCA4 (OMIM#603254), SMARCB1 (OMIM#601607), ARID2 (OMIM#609539), and SMARCE1 (OMIM#603111) (Bogershausen and Wollnik, 2018).