Journal
INSECT MOLECULAR BIOLOGY
Volume 14, Issue 2, Pages 217-222Publisher
WILEY
DOI: 10.1111/j.1365-2583.2005.00551.x
Keywords
genome size; genome organization; hard ticks; reassociation kinetics
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Genome sizes and the organization of repetitive DNA were determined in the hard ticks Ixodes scapularis and Boophilus microplus using reassociation kinetics. The I. scapularis genome contains similar to 2.15 pg (2.1 x 10(3) Mbp) of DNA and consists of no foldback (FB), 27% highly repetitive (HR), 39% moderately repetitive (MR), and 34% unique DNA. The B. microplus genome contains 7.5 pg (7.1 x 10(3) Mbp) DNA, and consists of 0.82% FB, 31% HR, 38% MR, and 30% unique DNA. In both species, repetitive sequences occur in a mixture of long and short period interspersion but most (65-80%) of the DNA follows a pattern of short period interspersion. Genome size and organization in the three tick species so far examined are distinct from other arthropods in having a greater proportion of MR, a lower proportion of unique and HR DNA of very low sequence complexity.
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