2026-06-27T12:32:00Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/978242024-08-29T00:10:08Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Maravilla, Alexis author Rosato, Carmen Luisa Marcela author Rosselló, Josep author 2021 The discovery of telomeric repeats in interstitial regions of plant chromosomes (ITRs) through molecular cytogenetic techniques was achieved several decades ago. However, the information is scattered and has not been critically evaluated from an evolutionary perspective. Based on the analysis of currently available data, it is shown that ITRs are widespread in major evolutionary lineages sampled. However, their presence has been detected in only 45.6% of the analysed families, 26.7% of the sampled genera, and in 23.8% of the studied species. The number of ITR sites greatly varies among congeneric species and higher taxonomic units, and range from one to 72 signals. ITR signals mostly occurs as homozygous loci in most species, however, odd numbers of ITR sites reflecting a hemizygous state have been reported in both gymnosperm and angiosperm groups. Overall, the presence of ITRs appears to be poor predictors of phylogenetic and taxonomic relatedness at most hierarchical levels. The presence of ITRs and the number of sites are not significantly associated to the number of chromosomes. The longitudinal distribution of ITR sites along the chromosome arms indicates that more than half of the ITR presences are between proximal and terminal locations (49.5%), followed by proximal (29.0%) and centromeric (21.5%) arm regions. Intraspecific variation concerning ITR site number, chromosomal locations, and the differential presence on homologous chromosome pairs has been reported in unrelated groups, even at the population level. This hypervariability and dynamism may have likely been overlooked in many lineages due to the very low sample sizes often used in cytogenetic studies. Maravilla, A.J.; Rosato, M.; Rosselló, J.A. Interstitial Telomeric-like Repeats (ITR) in Seed Plants as Assessed by Molecular Cytogenetic Techniques: A Review. Plants 2021, 10, 2541. https://doi.org/10.3390/plants10112541 2223-7747 10.3390/plants10112541 https://hdl.handle.net/20.500.14352/97824 https://www.doi.org/10.3390/plants10112541 https://www.mdpi.com/2223-7747/10/11/2541 Interstitial Telomeric-like Repeats (ITR) in Seed Plants as Assessed by Molecular Cytogenetic Techniques: A Review