D2d, a D-End class I gene: tissue expression and alternative processing of the pre-mRNA

Area of Science:

• Immunogenetics
• Molecular biology
• Mice models

Background:

• The H-2D region of the major histocompatibility complex (MHC) in BALB/c mice contains multiple class I genes.
• The expression patterns and functions of D2d, D3d, and D4d genes remain largely uncharacterized.

Purpose of the Study:

• To investigate the expression of the D2d gene in mice.
• To analyze the alternative splicing of D2d mRNA and its regulation.

Main Methods:

• Transfection of mouse L cells with wildtype or exon-shuffled D2d genes.
• Analysis of mRNA from transfected cells and various mouse tissues.
• Investigating the impact of Concanavalin A (Con A) supernatants and vesicular stomatitis virus (VSV) infection on D2d mRNA splicing.

Main Results:

• Two forms of D2d mRNA, generated by alternative splicing, were detected at roughly equal levels in transfected cells.
• D2d mRNA was found in multiple tissues, with the highest expression in lymphoid organs.
• Tumor lines also expressed D2d mRNA, with varying ratios of alternatively spliced to normally spliced message.
• Interferon and VSV infection altered the ratio of alternatively spliced D2d mRNA.

Conclusions:

• The D2d gene is expressed in various mouse tissues, particularly lymphoid organs.
• Alternative splicing of D2d mRNA occurs and its ratio can be modulated by external stimuli like interferon and viral infection.
• Further research is needed to elucidate the functional significance of D2d gene expression and its alternatively spliced variants.