Interstitial Telomeric-like Repeats (ITR) in Seed Plants as Assessed by Molecular Cytogenetic Techniques: A Review

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dc.contributor.authorMaravilla, Alexis J.
dc.contributor.authorRosato, Carmen Luisa Marcela
dc.contributor.authorRosselló, Josep A.
dc.date.accessioned2024-02-01T15:03:03Z
dc.date.available2024-02-01T15:03:03Z
dc.date.issued2021
dc.description.abstractThe 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.
dc.description.departmentDepto. de Genética, Fisiología y Microbiología
dc.description.facultyFac. de Ciencias Biológicas
dc.description.refereedTRUE
dc.description.statuspub
dc.identifier.doi10.3390/plants10112541
dc.identifier.issn2223-7747
dc.identifier.officialurlhttps://www.doi.org/10.3390/plants10112541
dc.identifier.relatedurlhttps://www.mdpi.com/2223-7747/10/11/2541
dc.identifier.urihttps://hdl.handle.net/20.500.14352/97824
dc.journal.titlePlants
dc.language.isoeng
dc.rightsAttribution 4.0 Internationalen
dc.rights.accessRightsopen access
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subject.ucmCiencias Biomédicas
dc.subject.unesco24 Ciencias de la Vida
dc.titleInterstitial Telomeric-like Repeats (ITR) in Seed Plants as Assessed by Molecular Cytogenetic Techniques: A Review
dc.typejournal article
dc.type.hasVersionVoR
dspace.entity.typePublication
relation.isAuthorOfPublicationa057712b-ba1a-40f4-9dc8-0315bf1bb33b
relation.isAuthorOfPublication.latestForDiscoverya057712b-ba1a-40f4-9dc8-0315bf1bb33b
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