LZTS2 Emerges as a Regulator of Craniofacial Development and Modulator of DYRK1A

Area of Science:

• Developmental Biology
• Genetics
• Molecular Biology

Background:

• DYRK1A dosage is critical for embryonic development, particularly craniofacial morphogenesis.
• LZTS2 is a known DYRK1A-interacting protein, but its role in embryonic development is unclear.
• The specific contribution of LZTS2 to craniofacial development has not been previously investigated.

Purpose of the Study:

• To investigate the role of LZTS2 in craniofacial development using *Xenopus laevis*.
• To explore the functional relationship between LZTS2 and DYRK1A during embryogenesis.

Main Methods:

• Utilized *Xenopus laevis* as a model organism.
• Examined gene expression patterns of Lzts2 and Dyrk1a in developing craniofacial tissues.
• Performed gene knockdown experiments for Lzts2 and analyzed resulting craniofacial phenotypes.
• Assessed the impact of Lzts2 and Dyrk1a interactions on neural crest-associated gene expression (sox9, pax3).
• Compared human phenotypes associated with copy number variations of LZTS2 and DYRK1A.

Main Results:

• Lzts2 and Dyrk1a exhibit overlapping expression in developing facial tissues.
• Lzts2 knockdown resulted in disrupted craniofacial morphogenesis and reduced expression of sox9 and pax3.
• Phenotypes from Lzts2 knockdown mirrored those caused by reduced Dyrk1a function.
• Synergistic craniofacial defects were observed with combined sub-phenotypic reductions of Lzts2 and Dyrk1a.
• Partial Lzts2 reduction mitigated phenotypes associated with Dyrk1a overexpression.
• Human genetic data showed overlapping phenotypes for LZTS2 and DYRK1A copy number gains, suggesting functional interaction.

Conclusions:

• LZTS2 is identified as a novel regulator of craniofacial development.
• A functional interaction between LZTS2 and DYRK1A during embryogenesis is supported.
• Targeting LZTS2 or its interacting partners could offer a method to modulate DYRK1A-dependent developmental pathways.