Characterization of a novel CAPN3 transcript generated by alternative splicing in cattle

Area of Science:

• * Molecular biology
• * Proteomics
• * Animal genetics

Background:

• * Calpain-3 (CAPN3) is a calcium-regulated protease crucial for muscle structure and mitochondrial function.
• * CAPN3 influences beef tenderness, but its transcript variants in cattle are unknown.
• * Previous studies identified multiple CAPN3 transcripts in various species.

Purpose of the Study:

• * To identify and characterize CAPN3 transcripts in Chinese local black cattle.
• * To investigate the functional implications of identified CAPN3 variants.

Main Methods:

• * Analysis of skeletal muscle tissue from local black cattle.
• * Transcript identification using molecular techniques.
• * Bioinformatic analysis for functional assessment of protein domains.

Main Results:

• * Two CAPN3 transcripts, CAPN3a (full-length) and CAPN3b (truncated), were identified.
• * CAPN3b expression was ~50-fold lower than CAPN3a.
• * Bioinformatic analysis indicated CAPN3b lacks essential domains for functional protein translation.

Conclusions:

• * This study provides the first identification of CAPN3 transcripts in cattle.
• * The identified non-functional CAPN3b transcript offers a basis for understanding CAPN3's role in meat quality.
• * Findings contribute to the knowledge of CAPN3 function and its impact on beef tenderness.