TY - JOUR T1 - LINE-1 and SINE-B1 mapping and genome diversification in <em>Proechimys</em> species (Rodentia: Echimyidae) JF - Life Science Alliance JO - Life Sci. Alliance DO - 10.26508/lsa.202101104 VL - 5 IS - 6 SP - e202101104 AU - Simone Cardoso Soares AU - Eduardo Schmidt Eler AU - Carlos Eduardo Faresin e Silva AU - Maria Nazareth Ferreira da Silva AU - Naiara Pereira Araújo AU - Marta Svartman AU - Eliana Feldberg Y1 - 2022/06/01 UR - https://www.life-science-alliance.org/content/5/6/e202101104.abstract N2 - This study aimed to understand the impact of LINE-1 and SINE-B1 retroelements on the architecture and karyotypic diversification of five rodent species of the genus Proechimys from different regions of the Amazon. Karyotype comparisons were performed using fluorescent interspecific in situ hybridization. The L1 and B1 retroelements showed a non-random arrangement and a conserved pattern when the genomes of the five species of Proechimys were compared, including the two cytotypes of Proechimys guyannensis. The signal homeology among the chromosomes and the degree of similarity among the formed clusters indicate rearrangements such as fusion/fission, and demonstrates that these retroelements can behave as derived characters shared in Proechimys. The differentiated distribution and organization of these retroelements in the karyotypes and in the chromosomal fiber, respectively, may represent a strong indication of their role as generating sources of karyotypic diversity in the genus Proechimys and provide insights into the evolutionary relationships between taxa. ER -