Publication: Theoretical approach to the evolution of aphid bacterial endosymbionts
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2020-04-21
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Universidad Complutense de Madrid
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Abstract
Los insectos parecen ser particularmente proclives a la convivencia con muy diversas bacterias con quienes establecen relaciones de muy variada índole. En particular, los endosimbiontes primarios se alojan en exclusiva en el interior de células especializadas del insecto denominadas bacteriocitos, se transmiten verticalmente a la descendencia, y establecen una relación de mutua dependencia con el hospedador. Las particularidades de los endosimbiontes primarios han probado ser valiosos modelos en el estudio de las características y consecuencias evolutivas de la transición de un modo de vida libre a uno de dependencia total de un hospedador. El genoma bacteriano sufre diversos cambios tras la transición a un estilo de vida intracelular que desencadenan una masiva inhabilitación y pérdida de genes que desembocan en la constitución de un genoma prácticamente mínimo. A la luz de los datos actuales, adaptación, degeneración y evolución neutral son mecanismos posibles que pueden condicionar esta característica reducción genómica. Entonces, ¿qué fuerzas evolutivas están detrás de las características genómicas observadas en los endosimbiontes de insectos?...
Insects seem to be particularly prone to coexistence with very diverse bacteria with whom they establish very varied relationships. In particular, primary endosymbionts are housed exclusively within specialized insect cells called bacteriocytes, are transmitted vertically to offspring, and establish a mutually dependent relationship with the host. The characteristics of the primary endosymbionts have proven to be valuable models in the study of the evolutionary characteristics and consequences of the transition from a free lifestyle to one that is totally dependent on a host. The bacterial genome undergoes various changes after the transition to an intracellular lifestyle that triggers a massive disabling and loss of genes that lead to the constitution of a practically minimal genome. In the light of current data, adaptation, degeneration and neutral evolution are possible mechanisms that may condition this characteristic genomic reduction. So what evolutionary forces are behind the genomic characteristics observed in insect endosymbionts? ...
Insects seem to be particularly prone to coexistence with very diverse bacteria with whom they establish very varied relationships. In particular, primary endosymbionts are housed exclusively within specialized insect cells called bacteriocytes, are transmitted vertically to offspring, and establish a mutually dependent relationship with the host. The characteristics of the primary endosymbionts have proven to be valuable models in the study of the evolutionary characteristics and consequences of the transition from a free lifestyle to one that is totally dependent on a host. The bacterial genome undergoes various changes after the transition to an intracellular lifestyle that triggers a massive disabling and loss of genes that lead to the constitution of a practically minimal genome. In the light of current data, adaptation, degeneration and neutral evolution are possible mechanisms that may condition this characteristic genomic reduction. So what evolutionary forces are behind the genomic characteristics observed in insect endosymbionts? ...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Departamento de Bioquímica y Biología Molecular, leída el 28/11/2019