Effect of CRISPR/Cas9-mediated SYCP1 gene expression depletion in MCF7 breast adenocarcinoma cells (RNA-seq)

Through various approaches we demonstrate that SYCP1 is aberrantly re-expressed in tumor cells, where it actively promotes DNA damage repair, cell cycle progression, and malignant growth. SYCP1 binds chromatin at regulatory elements and directly controls transcriptional programs governing genome maintenance, including key effectors such as CCNB1, PCNA, RAD51C, and H2AX. Loss of SYCP1 impairs DNA repair kinetics, attenuates tumor cell proliferation and migration, and increases sensitivity to chemotherapeutics cisplatin and gemcitabine. Mechanistically, SYCP1 interfaces with chromatin remodeling complexes and transcription factors SP1 and SP2, modulating their genomic occupancy and facilitating oncogenic transcriptional outputs. Our findings illuminate a previously unrecognized moonlighting function of SYCP1 in somatic cancer cells and position it as a critical chromatin-associated regulator of genome stability. In the presented RNA-seq experiment, we aimed to identify the differentially expressed genes between samples of wild type MCF7 cells and the samples with CRISPR/Cas9-mediated SYCP1 gene KO.