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Structural analysis of histamine N-methyltransferase gene
M Takemura1, K Yamauchi, A Yamatodani
1Department of Pharmacology, Hyogo College of Medicine, Nishinomiya, Japan.
Methods and Findings in Experimental and Clinical Pharmacology
|November 1, 1995
Summary
Researchers isolated a rat histamine N-tele-methyltransferase (HMT) gene fragment, revealing its exon structure and identifying sequence similarities between rat and human HMT. This study advances understanding of HMT gene evolution and function.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Histamine N-tele-methyltransferase (HMT) is a key enzyme in histamine metabolism.
- Understanding the genetic structure of HMT is crucial for elucidating its regulatory mechanisms and evolutionary history.
Purpose of the Study:
- To isolate and characterize a portion of the rat histamine N-tele-methyltransferase (HMT) gene.
- To analyze the exon-intron structure and sequence homology of the rat HMT gene with its human counterpart.
Main Methods:
- Gene cloning and sequencing techniques were employed to isolate an 11 kb fragment of the rat HMT gene.
- Comparative sequence analysis was performed between rat and human HMT cDNAs and flanking regions.
Main Results:
- An 11 kb clone containing 4 exons of the rat HMT gene was isolated, with the final exon comprising over half of the cDNA.
- Significant sequence divergence was observed in the 3' untranslated regions of rat and human HMT, with some homology found in flanking gene regions.
- An exon interruption was identified near a conserved glycine residue in methyltransferases.
Conclusions:
- The characterization of the rat HMT gene provides insights into its structural organization.
- Comparative analysis highlights evolutionary differences and conserved elements in HMT genes between species.
- The findings contribute to a deeper understanding of methyltransferase gene structure and evolution.