Comparative genomics on Vangl1 and Vangl2 genes

Area of Science:

• Molecular Biology
• Genomics
• Evolutionary Biology

Background:

• WNT signaling pathways, including beta-catenin and planar cell polarity (PCP), play critical roles in cellular functions.
• The WNT-PCP pathway, involving molecules like Drosophila Van Gogh (Vang), is essential for cell motility and metastasis.
• Mammalian homologs Vangl1 and Vangl2 are key components of the PCP pathway, interacting with various intracellular proteins.

Purpose of the Study:

• To identify and characterize the rat Vangl1 and Vangl2 genes.
• To perform comparative genomics of Vangl1 and Vangl2 orthologs across vertebrates.
• To elucidate the evolutionary conservation of genomic structure, regulatory elements, and protein motifs.

Main Methods:

• Bioinformatic analysis was employed to identify and characterize rat Vangl1 and Vangl2 genes.
• Comparative genomics was used to analyze exon-intron structures and promoter regions of mammalian Vangl1 and Vangl2 orthologs.
• Sequence analysis was performed to determine protein identity, transmembrane domains, and conserved motifs.

Main Results:

• Rat Vangl1 and Vangl2 genes were identified, with Vangl1 comprising eight exons within AC098913.7 and AC108524.6, and Vangl2 within AC118856.3 and AC115243.5.
• The exon-intron structure of mammalian Vangl1 and Vangl2 orthologs is conserved, as are promoter binding sites (e.g., E47, ELK1 for Vangl1; PAX4, NFkappaB, HNF4, SOX9, RFX1, POU2F1 for Vangl2).
• Rat Vangl1 (526 aa) and Vangl2 (521 aa) are transmembrane proteins with 71.5% amino acid identity, featuring conserved N-terminal Ser cluster and C-terminal PDZ-binding motifs.

Conclusions:

• This study provides the first comprehensive report on rat Vangl1 and Vangl2 genes.
• Comparative genomic analysis reveals significant evolutionary conservation in the structure and regulatory elements of Vangl1 and Vangl2 orthologs.
• The conserved protein motifs suggest functional importance in vertebrate PCP signaling.