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Malaymar Pinar, D.

Publications and source records attributed to Malaymar Pinar, D..

2 recordsLinked to original sources
bioRxiv2026

Multi-layered regulatory networks driving human dopaminergic neuron differentiation

Neuronal differentiation requires coordinated regulation across chromatin organization, gene expression, protein abundance, and post-translational modifications. Using the LUHMES human dopaminergic neuronal differentiation model, we integrated proteome and phosphoproteome profiling with previously generated enhancer-promoter interaction maps from NET-CAGE and HiCap and transcriptomic analysis across three consecutive differentiation stages. Differentiation was accompanied by increased abundance and phosphorylation of proteins involved in axon guidance, cytoskeletal organization, and synaptic signaling, alongside repression of the cell cycle, DNA replication, and chromatin-associated programs. Phosphoproteome analysis further revealed extensive remodeling of signaling networks associated with neuronal maturation. Enhancer-promoter interaction analysis revealed substantially greater rewiring at enhancers than promoters and identified master and relay transcription factors regulated across multiple molecular layers. siRNA-mediated knockdown showed that transcription factors MYT1, ISL2, and NHLH2 are crucial for proper neuronal maturation, whereas LCOR acts as a negative regulator of differentiation. Integrative network reconstruction further nominated MEOX2 as a candidate enhancer-associated regulator of late dopaminergic maturation. Together, these findings provide a multi-layered view of regulatory networks governing human neuronal differentiation.

systems biology↗
bioRxiv2026

A phosphorylation switch in PAGE4 drives MED12-mutant fibroid pathogenesis

Recurrent somatic mutations in MED12, found in [~]70% of uterine leiomyomas (ULs), define the dominant molecular subtype of these highly prevalent tumors, yet the downstream effector mechanisms remain poorly understood. Using an integrated multi-omics workflow, encompassing discovery-phase DDA proteomics of matched leiomyoma-myometrium pairs, validation-phase DIA proteomics across genetically stratified cohorts (MED12 p.G44D, RAD51B-HMGA2, IRS4/FH subtypes), phosphoproteomics, immunohistochemistry, and AP-MS interactomics, we identify prostate-associated gene 4 (PAGE4) as a central effector of MED12-mutant UL pathogenesis. PAGE4 emerged as one of the most significantly upregulated proteins in MED12-mutant ULs and harbored the highest-occupancy hyperphosphorylation sites (T51, T85) in the tumor phosphoproteome, a pattern confirmed by immunohistochemistry and orthogonal phosphoproteomics. Kinase-substrate enrichment nominated HIPK2 as the primary upstream kinase, with supporting evidence from the broader CMGC family. Subsequent analysis revealed that phosphorylation acts as a molecular switch, fundamentally restructuring the PAGE4 interactome to favor the Mediator complex and RNA Pol II transcriptional machinery. This rewiring was functionally validated by ChIP-seq and luciferase reporter assays, which demonstrated corresponding shifts in transcription factor occupancy and downstream pathway activity. Collectively, these data establish phospho-PAGE4 as a critical mechanistic node downstream of MED12 mutation, expand PAGE4 biology from prostate cancer to female reproductive tumors, and nominate it as a mechanistic biomarker and candidate therapeutic vulnerability in the most prevalent molecular subtype of uterine leiomyomas.

systems biology↗