Warburg Micro Syndrome 4, also known as warbm4, is related to rab18 deficiency and spastic cerebral palsy. An important gene associated with Warburg Micro Syndrome 4 is TBC1D20 (TBC1 Domain Family Member 20), and among its related pathways/superpathways are Vesicle-mediated transport and COPI-independent Golgi-to-ER retrograde traffic. Affiliated tissues include testes and ovary, and related phenotypes are delayed speech and language development and visual impairment