نتایج جستجو برای: synaptonemal complex

تعداد نتایج: 783949  

2008
Kent M. Reed Philip D. Sudman Jack W. Sites Ira F. Greenbaum KENT M. REED PHILIP D. SUDMAN

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Journal: :The Plant cell 2009
Matthieu Falque Lorinda K Anderson Stephen M Stack Franck Gauthier Olivier C Martin

We apply modeling approaches to investigate the distribution of late recombination nodules in maize (Zea mays). Such nodules indicate crossover positions along the synaptonemal complex. High-quality nodule data were analyzed using two different interference models: the "statistical" gamma model and the "mechanical" beam film model. For each chromosome, we exclude at a 98% significance level the...

2012
Abrahan Hernández-Hernández Rosario Ortiz Gerardo H. Vázquez-Nin

Meiosis is a process composed of two divisions of the germ line cells without an intervenient S phase, thus there is no duplication of DNA between the first and the second meiotic divisions. The first meiotic division begins with the pre-leptotene that is the stage where the DNA replicates and chromosomes prepare to enter the meiotic prophase I in most of the organisms with sexual reproduction ...

Journal: :Genetics and molecular research : GMR 2013
C I Aquino V V Abril J M B Duarte

Deer species of the genus Mazama show significant inter- and intraspecific chromosomal variation due to the occurrence of rearrangements and B chromosomes. Given that carriers of aneuploidies and structural rearrangements often show anomalous chromosome pairings, we here performed a synaptonemal complex analysis to study chromosome pairing behavior in a red brocket deer (Mazama americana) indiv...

2016
Laura Gómez-H Natalia Felipe-Medina Manuel Sánchez-Martín Owen R Davies Isabel Ramos Ignacio García-Tuñón Dirk G de Rooij Ihsan Dereli Attila Tóth José Luis Barbero Ricardo Benavente Elena Llano Alberto M Pendas

Meiotic recombination generates crossovers between homologous chromosomes that are essential for genome haploidization. The synaptonemal complex is a 'zipper'-like protein assembly that synapses homologue pairs together and provides the structural framework for processing recombination sites into crossovers. Humans show individual differences in the number of crossovers generated across the gen...

ژورنال: Anatomical Sciences Journal 2012
Motiei, Marjan, Tavalaee, Marzieh, Nasr Esfahani , Mohammad Hossein,

The heat shock proteins (HSPs) are a group of homologous proteins encoded with a multigene family. They can be divided into five groups based on both size and function; including HSP27, HSP60, HSP70, HSP90 and HSP100. Expression of HSPs can be constitutive and can increased when cells undergo metabolic and/or heat stress. HSPA2/Hsp70-2 is a kind of HSP70 and constitutively expressed in testis. ...

Journal: :Journal of cell science 2008
Geert Hamer Hong Wang Ewelina Bolcun-Filas Howard J Cooke Ricardo Benavente Christer Höög

The synaptonemal complex is an elaborate meiosis-specific supramolecular protein assembly that promotes chromosome synapsis and meiotic recombination. We inactivated the meiosis-specific gene Tex12 and found that TEX12 is essential for progression of meiosis in both male and female germ cells. Structural analysis of the synaptonemal complex in Tex12-/- meiocytes revealed a disrupted central ele...

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