Large transcripts and sequence from a polymorphic 170 kb MHC region implicated in susceptibility to autoimmune...

Area of Science:

• Human genetics
• Molecular biology
• Immunogenetics

Background:

• The human major histocompatibility complex (MHC) is a critical region for immune function and disease susceptibility.
• Previous studies indicated the importance of the MHC region for autoimmune diseases like insulin-dependent diabetes mellitus and myasthenia gravis.

Purpose of the Study:

• To localize novel transcripts within a specific 170 kb region of the human MHC.
• To investigate the potential role of these transcripts in autoimmune disease susceptibility.

Main Methods:

• Utilized overlapping yeast artificial chromosome (YAC) clones for transcript localization.
• Employed cloned genomic probes to refine transcript locations.
• Analyzed transcript sizes and expression in liver and lung tissues.

Main Results:

• Identified and localized several new transcripts within 15 kb centromeric of the HLA-B gene.
• Detected at least four transcripts (7.5 kb to 3.4 kb) in the liver and two transcripts (5.8 kb and 4.2 kb) in the lung.
• Confirmed the utility of large YACs (up to 360 kb) as probes for transcript discovery.
• Identified a large, multiply spliced gene (PERB6) in the MHC region between HLA-B and BAT1.

Conclusions:

• The newly identified transcripts in the MHC region may contribute to autoimmune disease susceptibility.
• Yeast artificial chromosomes are effective tools for discovering novel transcripts in complex genomic regions.
• The PERB6 gene represents a significant genetic element within the MHC with potential functional implications.