A cryo-fixation protocol to study the structure of the synaptonemal complex.
Chromosome Res
; 30(4): 385-400, 2022 12.
Article
em En
| MEDLINE
| ID: mdl-35486207
ABSTRACT
Genetic variability in sexually reproducing organisms results from an exchange of genetic material between homologous chromosomes. The genetic exchange mechanism is dependent on the synaptonemal complex (SC), a protein structure localized between the homologous chromosomes. The current structural models of the mammalian SC are based on electron microscopy, superresolution, and expansion microscopy studies using chemical fixatives and sample dehydration of gonads, which are methodologies known to produce structural artifacts. To further analyze the structure of the SC, without chemical fixation, we have adapted a cryo-fixation method for electron microscopy where pachytene cells are isolated from mouse testis by FACS, followed by cryo-fixation, cryo-substitution, and electron tomography. In parallel, we performed conventional chemical fixation and electron tomography on mouse seminiferous tubules to compare the SC structure obtained with the two fixation methods. We found several differences in the structure and organization of the SC in cryo-fixed samples when compared to chemically preserved samples. We found the central region of the SC to be wider and the transverse filaments to be more densely packed in the central region of the SC.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Complexo Sinaptonêmico
/
Microscopia
Limite:
Animals
Idioma:
En
Revista:
Chromosome Res
Assunto da revista:
BIOLOGIA MOLECULAR
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
México