Bread wheat satellitome: a complex scenario in a huge genome
Metadatos
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Springer Nature
Materia
Wheat satDNA Repetitive DNA
Fecha
2024-01-30Referencia bibliográfica
Gálvez-Galván, A., Garrido-Ramos, M.A. & Prieto, P. Bread wheat satellitome: a complex scenario in a huge genome. Plant Mol Biol 114, 8 (2024). https://doi.org/10.1007/s11103-023-01404-x
Patrocinador
PID2019-103996RB-I00 grant from the MCIN/AEI/https://doi.org/10.13039/501100011033; Qualifica Project QUAL21_023 IAS from Consejería de Transformación Económica, Industria, Conocimiento y Universidades/Cofinanciación and Programa Operativo FEDER de Andalucía 2014-2020; Spanish MCIN for PhD PRE2020-094798 grant; Biociencias y ciencias agroalimentarias PhD programme from the University of Córdoba; Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature.Resumen
In bread wheat (Triticum aestivum L.), chromosome associations during meiosis are extremely regulated and initiate at the
telomeres and subtelomeres, which are enriched in satellite DNA (satDNA). We present the study and characterization of
the bread wheat satellitome to shed light on the molecular organization of wheat subtelomeres. Our results revealed that the
2.53% of bread wheat genome is composed by satDNA and subtelomeres are particularly enriched in such DNA sequences.
Thirty-four satellite DNA (21 for the first time in this work) have been identified, analyzed and cytogenetically validated.
Many of the satDNAs were specifically found at particular subtelomeric chromosome regions revealing the asymmetry in
subtelomere organisation among the wheat subgenomes, which might play a role in proper homologous recognition and pairing
during meiosis. An integrated physical map of the wheat satellitome was also constructed. To the best of our knowledge,
our results show that the combination of both cytogenetics and genome research allowed the first comprehensive analysis of
the wheat satellitome, shedding light on the complex wheat genome organization, especially on the polymorphic nature of
subtelomeres and their putative implication in chromosome recognition and pairing during meiosis.