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Use of two transcription starts in the G6PD gene of the bark beetle Ips typographus
Author(s) -
Doleželová E.,
Žurovec M.,
Böhmová M.,
Sehnal F.
Publication year - 2006
Publication title -
insect molecular biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.955
H-Index - 93
eISSN - 1365-2583
pISSN - 0962-1075
DOI - 10.1111/j.1365-2583.2006.00604.x
Subject(s) - exon , biology , gene isoform , intron , gene , genetics , transcription (linguistics) , microbiology and biotechnology , bark beetle , messenger rna , gene expression , bark (sound) , ecology , linguistics , philosophy
The enzyme glucose‐6‐phosphate dehydrogenase (G6PD) of the bark beetle Ips typographus is derived from a gene that includes eight exons and spans over 7100 nucleotides (nt). By means of two transcription starts, the gene generates two mRNA isoforms that are present in similar amounts in the larvae, pupae and adults. The A isoform includes exon IA of 115 nt, which is followed by intron 1a extending to position 3457 of the gene. The B mRNA isoform begins with exon IB (100 nt) that occupies positions 3291–3390 within the 1a intron. Exons II to VII are included in both mRNA isoforms. The gene contains 31.6% (36.5% in the translated region) of the GC nucleotides. Two transcription starts and the exon/intron organization distinguish bark beetle G6PD from the homologous genes known in other insects. Two enzyme variants were detected in the protein extracts of individual bark beetles but their relationship to the A and B mRNA isoforms is uncertain.