Spatial and temporal expression patterns of Osbpl2a and Osbpl2b during zebrafish embryonic development

Area of Science:

• Genetics and Developmental Biology
• Molecular Biology
• Otolaryngology

Background:

• Mutations in OSBPL2 (oxysterol binding protein-like protein 2) are a novel cause of autosomal dominant nonsyndromic hearing loss (ADNSHL).
• Understanding the expression patterns of OSBPL2 is crucial for elucidating its role in hearing development.

Purpose of the Study:

• To investigate the expression patterns of Osbpl2 in zebrafish.
• To identify the zebrafish ortholog of human OSBPL2 and understand its developmental expression.

Main Methods:

• Zebrafish were utilized as the animal model.
• Whole mount in situ hybridization was employed to examine Osbpl2 expression patterns during zebrafish development.

Main Results:

• Zebrafish possess two Osbpl2 homologues: Osbpl2a and Osbpl2b, with Osbpl2b identified as the ortholog of human OSBPL2.
• Osbpl2b exhibited strong maternal expression and was detected in the otic vesicle at 96 hours post-fertilization.
• Osbpl2a showed different expression patterns and lacked significant maternal expression.

Conclusions:

• Osbpl2b is the functional ortholog of human OSBPL2, implicated in ADNSHL.
• The distinct expression profiles of Osbpl2a and Osbpl2b in zebrafish contribute to understanding OSBPL2's role in hearing.
• This research provides a foundation for further studies on the molecular mechanisms of OSBPL2 in hearing loss.