SYCP1 and Infertility: CPEB1 is preferentially expressed in germ cells and regulates the translation of crucial genes involved in meiosis and oogenesis, such as the synapsis complex protein genes SYCP1 and SYCP3. Oocytes that are deficient in CPEB1 arrest at the pachytene stage due to abnormal synaptonemal complex formation, resulting in ovarian atresia and infertility [6].