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BAIAP2L1
BAIAP2L1 Full Name
BAI1-associated protein 2-like 1
BAIAP2L1 Introduction
BAIAP2L1 (BAI1-associated protein 2-like 1), also known as insulin receptor tyrosine kinase substrate (IRTKS), is an I-BAR domain-containing protein that connects plasma membrane dynamics with actin cytoskeleton organization and intracellular signaling. For researchers investigating abnormal cell morphology, migration, or membrane remodeling, BAIAP2L1 is particularly relevant because its I-BAR domain interacts with phosphoinositide-rich membranes and helps regulate membrane curvature and protrusion formation. BAIAP2L1 also contains an SH3 domain that supports interactions with signaling and cytoskeletal proteins, allowing it to function as a molecular scaffold rather than simply a structural membrane protein. Studies have linked BAIAP2L1 to Rac-dependent cytoskeletal remodeling and interactions with proteins such as Eps8, WAVE2, and FMNL2, which contribute to filopodia, membrane ruffling, and cellular motility. These properties make BAIAP2L1 a useful target for studying how membrane architecture, actin dynamics, and signaling pathways are coordinated during cellular responses.
Beyond its established role at the plasma membrane, emerging evidence suggests that BAIAP2L1 has broader functions in signal transduction, nuclear organization, and cellular stress responses. BAIAP2L1 has been implicated in insulin-related signaling and can influence downstream pathways that regulate cell growth and survival. More recent work has identified an unexpected role for IRTKS/BAIAP2L1 in heterochromatin organization through liquid-liquid phase separation. IRTKS condensates can interact with HP1α-associated heterochromatin and promote SUMO-dependent remodeling, helping maintain genome organization and suppress inappropriate transcription of repetitive DNA elements. Loss of BAIAP2L1 can therefore disturb heterochromatin integrity, alter chromatin accessibility, activate cGAS-STING and type I interferon signaling, and promote cellular senescence. This expanding functional profile is important for experimental researchers because changes in BAIAP2L1 expression or activity may affect both cytoskeletal phenotypes and nuclear or transcriptional readouts, making pathway interpretation dependent on cellular context.
BAIAP2L1 is also increasingly studied in cancer biology because its effects on membrane remodeling and intracellular signaling can support malignant cell behavior. In colorectal cancer models, BAIAP2L1 has been associated with EGFR/c-Src signaling, while studies in breast cancer indicate that BAIAP2L1 can interact with ribosomal protein L3 through its SH3 domain and enhance AKT signaling, thereby promoting proliferation, invasion, tumor cell stemness, and chemotherapy resistance. Increased BAIAP2L1 expression has also been associated with more advanced breast cancer characteristics, although these findings should be interpreted as mechanistic and disease-association evidence rather than proof that BAIAP2L1 is an established clinical therapeutic target. Its involvement in cancer progression, cellular senescence, membrane dynamics, and signaling makes BAIAP2L1 a potentially valuable research target for studying tumor biology, drug resistance, cytoskeletal regulation, and stress-induced cellular remodeling, while further validation is needed to determine its value as a biomarker or intervention point across specific diseases.
Alternate Names for BAIAP2L1
BAIAP2L1; BAI1-associated protein 2-like 1; brain-specific angiogenesis inhibitor 1-associated protein 2-like protein 1; IRTKS; BAI1-associated protein 2-like protein 1; insulin receptor tyrosine kinase substrate; FLJ42275;
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