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Telomeric sequences are conserved across species. The most common sequence reported among insects is (TTAGG) n , but its universal occurrence is not a consensus because other canonical motifs have been reported. In the present study, we used fluorescence  in situ  hybridization ( FISH ) using telomeric probes with (TTAGG) 6  repeats to describe the telomere composition of leafcutter ants. We performed the molecular cytogenetic characterization of six    Acromyrmex    Mayr, 1865 and one    Atta    Fabricius, 1804 species (   Acromyrmex   ambiguus    (Emery, 1888),    Ac.   crassispinus    (Forel, 1909),    Ac.   lundii    (Guérin-Mèneville, 1838),    Ac.   nigrosetosus    (Forel, 1908),    Ac.   rugosus    (Smith, 1858),    Ac.   subterraneus   subterraneus    (Forel, 1893), and    Atta   sexdens    (Linnaeus, 1758)) and described it using a karyomorphometric approach on their chromosomes. The diploid chromosome number 2n = 38 was found in all    Acromyrmex    species, and the karyotypic formulas were as follows:    Ac.   ambiguus    2K = 14M + 12SM + 8ST + 4A,    Ac.   crassispinus    2K = 12M + 20SM + 4ST + 2A,    Ac.   lundii    2K = 10M + 14SM + 10ST + 4A,    Ac.   nigrosetosus    2K = 12M + 14SM + 10ST + 2A, and    Ac.   subterraneus   subterraneus    2K = 14M + 18SM + 4ST + 2A. The exact karyotypic formula was not established for    Ac.   rugosus   .  FISH  analyses revealed the telomeric regions in all the chromosomes of the species studied in the present work were marked by the (TTAGG) 6  sequence. These results reinforce the premise that   Formicidae   presents high homology between their genera for the presence of the canonical sequence (TTAGG) n .

comparative cytogenetics

Comparative FISH-mapping of TTAGG telomeric sequences to the chromosomes of leafcutter ants (  Formicidae  ,   Myrmicinae  ): is the insect canonical sequence conserved?