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

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 cur...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Alexis J. Maravilla, Marcela Rosato, Josep A. Rosselló
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	interstitial telomeric repeats in situ hybridisation chromosomal landmarks karyological evolution Botany QK1-989
Acceso en línea:	https://doaj.org/article/30923ba21feb47398ed78266bb4b1dcf
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:30923ba21feb47398ed78266bb4b1dcf
record_format	dspace
spelling	oai:doaj.org-article:30923ba21feb47398ed78266bb4b1dcf2021-11-25T18:47:31ZInterstitial Telomeric-like Repeats (ITR) in Seed Plants as Assessed by Molecular Cytogenetic Techniques: A Review10.3390/plants101125412223-7747https://doaj.org/article/30923ba21feb47398ed78266bb4b1dcf2021-11-01T00:00:00Zhttps://www.mdpi.com/2223-7747/10/11/2541https://doaj.org/toc/2223-7747The 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.Alexis J. MaravillaMarcela RosatoJosep A. RossellóMDPI AGarticleinterstitial telomeric repeatsin situ hybridisationchromosomal landmarkskaryological evolutionBotanyQK1-989ENPlants, Vol 10, Iss 2541, p 2541 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	interstitial telomeric repeats in situ hybridisation chromosomal landmarks karyological evolution Botany QK1-989
spellingShingle	interstitial telomeric repeats in situ hybridisation chromosomal landmarks karyological evolution Botany QK1-989 Alexis J. Maravilla Marcela Rosato Josep A. Rosselló Interstitial Telomeric-like Repeats (ITR) in Seed Plants as Assessed by Molecular Cytogenetic Techniques: A Review
description	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.
format	article
author	Alexis J. Maravilla Marcela Rosato Josep A. Rosselló
author_facet	Alexis J. Maravilla Marcela Rosato Josep A. Rosselló
author_sort	Alexis J. Maravilla
title	Interstitial Telomeric-like Repeats (ITR) in Seed Plants as Assessed by Molecular Cytogenetic Techniques: A Review
title_short	Interstitial Telomeric-like Repeats (ITR) in Seed Plants as Assessed by Molecular Cytogenetic Techniques: A Review
title_full	Interstitial Telomeric-like Repeats (ITR) in Seed Plants as Assessed by Molecular Cytogenetic Techniques: A Review
title_fullStr	Interstitial Telomeric-like Repeats (ITR) in Seed Plants as Assessed by Molecular Cytogenetic Techniques: A Review
title_full_unstemmed	Interstitial Telomeric-like Repeats (ITR) in Seed Plants as Assessed by Molecular Cytogenetic Techniques: A Review
title_sort	interstitial telomeric-like repeats (itr) in seed plants as assessed by molecular cytogenetic techniques: a review
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/30923ba21feb47398ed78266bb4b1dcf
work_keys_str_mv	AT alexisjmaravilla interstitialtelomericlikerepeatsitrinseedplantsasassessedbymolecularcytogenetictechniquesareview AT marcelarosato interstitialtelomericlikerepeatsitrinseedplantsasassessedbymolecularcytogenetictechniquesareview AT joseparossello interstitialtelomericlikerepeatsitrinseedplantsasassessedbymolecularcytogenetictechniquesareview
_version_	1718410702931099648

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

Ejemplares similares