Identification and characterization of functional genes encoding the mouse major urinary proteins

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Mouse major urinary proteins (MUPs) are a family of proteins synthesized in the liver.
• Tissue-specific expression patterns of MUPs are observed between different mouse strains and sexes.
• Understanding the genetic basis of MUP synthesis is crucial for studying gene regulation.

Purpose of the Study:

• To clone and characterize MUP genes from different mouse strains.
• To investigate the tissue specificity and regulatory mechanisms of MUP gene expression.
• To analyze the sequence homology and variations in the 5' flanking regions of MUP genes.

Main Methods:

• Stable transfection of mouse Ltk- cells with cloned MUP genes.
• Two-dimensional polyacrylamide gel electrophoresis for MUP identification.
• DNA sequence analysis of the 5' flanking regions of MUP genes.

Main Results:

• Identification of C57BL/6J MUP genomic clones encoding MUP 2, MUP 3, and MUP 4.
• Characterization of a BALB/c MUP clone (BJ-31) with distinct properties.
• Comigration analysis suggests tentative identification of tissue specificity and regulation for each MUP gene.
• High homology (0.20-2.40% divergence) observed in the 5' flanking regions of MUP genes.
• Sequence variations, particularly in an A-rich region 5' of the TATA box, were identified.

Conclusions:

• The study provides a basis for understanding MUP gene regulation and tissue-specific expression.
• Sequence analysis of the 5' flanking regions reveals conserved and variable elements potentially involved in gene control.
• Differences in MUP gene sequences may explain variations in protein synthesis observed between mouse strains.