Sequence and characterization of an insertion sequence, IS711, from Brucella ovis

Area of Science:

• Microbiology
• Genetics
• Molecular Biology

Background:

• Brucella ovis is a pathogen causing reproductive disease in sheep.
• Insertion sequences (IS) are mobile genetic elements that can influence genome evolution.
• Understanding IS elements in Brucella is crucial for studying bacterial pathogenesis and evolution.

Purpose of the Study:

• To characterize the nucleotide sequence and structural features of a novel insertion sequence, IS711, identified in Brucella ovis.
• To investigate the potential mechanisms of IS711 insertion and duplication.

Main Methods:

• Nucleotide sequencing of the IS711 element and flanking regions.
• Bioinformatic analysis of sequence data, including comparison with known IS elements and databases.
• Analysis of inverted repeats, open reading frames (ORFs), and target site duplication.

Main Results:

• The insertion sequence, designated IS711, is 842 bp long with 20-bp imperfect inverted repeats.
• IS711 duplicates a TA dinucleotide at its target site (YTAR).
• Minor nucleotide variations were observed among different IS711 elements.
• Some IS711 elements were found adjacent to identical or similar sequences, suggesting hot spots for insertion and alternative duplication mechanisms.
• No significant homology was found between IS711 and existing DNA or protein databases.

Conclusions:

• IS711 represents a novel insertion sequence in Brucella ovis with distinct structural and insertion characteristics.
• The findings suggest that IS711 may employ complex transposition and duplication strategies.
• IS711 is evolutionarily distinct, showing no resemblance to known mobile genetic elements or their products.