ACTBP4（Actin Beta Pseudogene 4）是一种假基因（pseudogene），属于β-肌动蛋白（β-actin）基因家族。假基因是基因组中与功能基因序列相似但通常因突变失去功能的DNA片段，可能不编码蛋白质或产生功能性RNA。β-肌动蛋白家族成员（如ACTB）编码细胞骨架蛋白，参与细胞形态维持、运动及信号传导等关键生物学过程，而ACTBP4作为其假基因，可能通过调控家族功能基因的表达或染色质结构间接发挥作用。目前对ACTBP4的具体功能研究较少，但假基因通常可能通过竞争性结合microRNA或转录因子来影响同源功能基因的表达。若ACTBP4过表达，可能干扰β-肌动蛋白家族基因（如ACTB）的调控网络，导致细胞骨架异常或运动功能障碍；表达降低则可能减少对功能基因的竞争性抑制，但具体效应尚不明确。该基因的突变或缺失通常对机体影响较小，因其本身无编码功能，但可能通过表观遗传机制影响邻近基因。假基因与疾病的关联研究仍在探索中，某些情况下其表达异常可能与癌症进展相关（如竞争内源性RNA机制）。β-肌动蛋白基因家族的共性包括：高度保守的编码序列、在细胞骨架动态组装中的核心作用，以及广泛参与发育、免疫应答等生理过程。需注意，ACTBP4的功能注释可能随研究进展更新，目前数据多基于生物信息学预测。

ACTBP4, designated as Actin Beta Pseudogene 4, is a non-functional genomic element belonging to the beta-actin gene family, which is primarily known for encoding critical cytoskeletal proteins involved in maintaining cell morphology, facilitating motility, and mediating intracellular signal transduction. As a pseudogene, ACTBP4 shares high sequence homology with its functional paralog, ACTB, but typically lacks the capacity to produce stable, functional proteins due to accumulated mutations, insertions, or deletions that disrupt its open reading frame. Despite the absence of protein-coding potential, ACTBP4 may exert indirect biological effects by serving as a decoy for regulatory molecules; for instance, it can competitively bind microRNAs or transcription factors, thereby modulating the expression levels of functional beta-actin genes through competitive endogenous RNA (ceRNA) mechanisms. Such regulatory interference could potentially impact the dynamic assembly of the actin cytoskeleton, influencing cellular processes ranging from immune response and development to tissue homeostasis. While the specific physiological role of ACTBP4 remains an area of active investigation and is largely inferred from bioinformatic predictions, dysregulation of its expression has been hypothesized to contribute to pathological states, including cancer progression, by altering the stoichiometry of regulatory RNAs and affecting the broader actin regulatory network. Consequently, although ACTBP4 itself does not encode a functional protein, its presence in the genome may influence chromatin structure and the expression of neighboring or homologous genes, highlighting the complex interplay between functional genes and their pseudogene counterparts in cellular physiology and disease.

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