{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nA series of studies have detailed how Abl‐interactor (Abi) family proteins integrate extracellular signals with actin cytoskeletal remodeling. For instance, Abi1 has been shown to recruit class I PI3K via its p85 subunit, thereby facilitating Rac activation and downstream actin reorganization. In addition, Abi1 interacts with factors such as Mammalian Enabled (Mena) and the WAVE2 complex, ensuring that signals from receptor tyrosine kinases and c‐Abl kinase are efficiently transduced to promote membrane ruffling and dynamic actin assembly."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFurther complementary work has revealed that the WAVE complex—and its association with Abi1—is vital for the formation of filamentous actin structures that mediate cell spreading and directional migration. In macrophages and other cell types, components of the WAVE2‐Abi1 complex are recruited into F‐actin–rich protrusions in response to chemoattractants, and deficits in these proteins impair normal migration, dorsal ruffling, and integrin‐mediated cell adhesion. Additionally, loss of Abi1 not only disrupts the stability of the WAVE complex but also negatively affects overall cell motility and developmental processes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional studies have expanded our understanding of these regulatory pathways by connecting aberrant Abi interactions with oncogenic signals. The interactions of Abi proteins with partners such as c‐Abl and components of the leukemogenic pathway have been implicated in the dysregulation of kinase activities and abnormal tyrosine phosphorylation events. Efforts to dissect these molecular links reveal that while some Abi family members serve as bridges between kinases and the actin machinery, alterations in these interactions may contribute to malignant transformation and impact cell cycle progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBy contrast to the extensively characterized role of Abi proteins in actin and signaling regulation, recent investigations have begun to shed light on PRKRIP1—a component of the splicing C complex. Emerging evidence in colorectal cancer suggests that PRKRIP1 may influence alternative splicing events critical for cancer development and progression. Although its exact molecular functions remain to be fully elucidated, differential PRKRIP1 expression appears to correlate with clinicopathological features and patient prognosis, indicating that it may serve as both a biomarker and a potential regulatory node in tumor biology."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Metello Innocenti, Emanuela Frittoli, Isabella Ponzanelli, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Phosphoinositide 3-kinase activates Rac by entering in a complex with Eps8, Abi1, and Sos-1."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Cell Biol (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1083/jcb.200206079"}], "href": "https://doi.org/10.1083/jcb.200206079"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12515821"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12515821"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Katsuko Tani, Seiichi Sato, Taiko Sukezane, et al. 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