Cloning and sequence analysis of the human gene encoding eosinophil major basic protein

Area of Science:

• Molecular Biology
• Immunology
• Genetics

Background:

• Eosinophils are immune cells that release major basic protein (MBP).
• MBP is a potent toxin effective against helminths and mammalian cells.
• MBP is a single polypeptide characterized by its high arginine content.

Purpose of the Study:

• To clone and determine the nucleotide sequence of the eosinophil major basic protein (MBP) gene.
• To analyze the structural features of the MBP gene, including exons, introns, and regulatory elements.
• To investigate the polymorphism of the MBP gene.

Main Methods:

• Gene cloning techniques were employed to isolate the MBP gene.
• Nucleotide sequencing was performed to determine the genetic sequence.
• Southern blotting was used to assess gene polymorphism.

Main Results:

• The 3.3-kb MBP gene was successfully cloned and its nucleotide sequence determined.
• The gene comprises six exons and five introns, with one intron containing an Alu family repeat.
• The deduced exon sequence aligns with previously reported MBP cDNA sequences.
• Analysis revealed a putative promoter region with TATA and CCAAT boxes preceding the gene.
• Southern blot analysis indicated limited polymorphism in the MBP gene.

Conclusions:

• The complete nucleotide sequence and structural organization of the eosinophil MBP gene have been elucidated.
• The identified promoter elements suggest transcriptional regulation mechanisms.
• The findings provide a foundation for further studies on MBP gene expression and function.