Tagged actin mRNA dysregulation in IGF2BP1[Formula: see text] mice

Area of Science:

• Molecular Biology
• Neuroscience
• Developmental Biology

Background:

• Gene expression is regulated by RNA-binding proteins (RBPs).
• Insulin-like Growth Factor II mRNA-Binding Protein (IGF2BP1) influences RNA localization, transport, and translation.
• IGF2BP1 is implicated in cell survival, differentiation, and migration.

Purpose of the Study:

• To investigate the role of IGF2BP1 in brain development and neonatal survival using a knockout mouse model.
• To understand the impact of IGF2BP1 on neocortical development and cell migration.
• To elucidate the regulatory mechanisms of IGF2BP1 on target mRNAs, specifically beta-actin mRNA.

Main Methods:

• Generation and characterization of IGF2BP1 knockout mice.
• BrdU labeling to assess cell proliferation and migration in the developing neocortex.
• Generation of mice with endogenously labeled beta-actin mRNA (beta-actin-MS2) to study RNA dynamics.
• Analysis of beta-actin mRNA transcription, protein content, transport, and anchoring in knockout neurons.

Main Results:

• IGF2BP1 knockout mice exhibit impaired brain development and reduced neonatal survival.
• Disorganization in the developing neocortex, including loss of cortical marginal cell density.
• Reduced numbers of mitotically active cells in the cortical plate of knockout mice.
• IGF2BP1 knockout neurons show increased beta-actin mRNA transcription and protein levels.
• Impaired transport and anchoring of beta-actin mRNA in IGF2BP1 knockout neurons.

Conclusions:

• IGF2BP1 is essential for proper brain development and neonatal survival.
• IGF2BP1 plays a critical role in regulating neocortical organization and cell migration.
• IGF2BP1 directly impacts the regulation of beta-actin mRNA, affecting its transcription, translation, transport, and anchoring.
• The generated knockout and labeled mouse models provide valuable tools for studying RBP regulation of target mRNAs.