title: Automatic segmentation of high pressure frozen and freeze-substituted mouse retina nuclei from FIB-SEM tomograms.
abstract: Focused Ion Beam milling combined with Scanning Electron Microscopy is a powerful tool to determine the 3-D organization of whole cells and tissue at an isotropic resolution of 3-5nm. This opens the possibility to quantify several cellular parameters and to provide detailed phenotypic information in normal or disease states. Here we describe Biocomputing methods to extract in an automated way characteristic features of mouse rod photoreceptor nuclei such as the shape and the volume of the nucleus; the proportion of heterochromatin; the number, density and distribution of nuclear pore complexes (NPC). Values obtained on five nuclei show that the number of NPC (348±8) is the most conserved feature. Nuclei in higher eukaryotes show large variations in size and rod nuclei are amongst the smallest reported (32±3μm3). Despite large species- and cell-type-specific variations in size, the density of NPC (about 15/μm2) is highly conserved.
authors.affiliation: IGBMC (Institut de Génétique et de Biologie Moléculaire et Cellulaire), 1, rue Laurent Fries, BP 10142, 67404 Illkirch, France; Inserm, U964, Illkirch, France; CNRS, UMR7104, Illkirch, France; Université de Strasbourg, Strasbourg, France.
authors.forename: Thai V
authors.initials: TV
authors.lastname: Hoang
authors.affiliation: University of Lausanne, Electron Microscopy Facility, 1015 Lausanne, Switzerland.
authors.forename: Caroline
authors.initials: C
authors.lastname: Kizilyaprak
authors.affiliation: IGBMC (Institut de Génétique et de Biologie Moléculaire et Cellulaire), 1, rue Laurent Fries, BP 10142, 67404 Illkirch, France; Inserm, U964, Illkirch, France; CNRS, UMR7104, Illkirch, France; Université de Strasbourg, Strasbourg, France.
authors.forename: Danièle
authors.initials: D
authors.lastname: Spehner
authors.affiliation: University of Lausanne, Electron Microscopy Facility, 1015 Lausanne, Switzerland.
authors.forename: Bruno M
authors.initials: BM
authors.lastname: Humbel
authors.affiliation: IGBMC (Institut de Génétique et de Biologie Moléculaire et Cellulaire), 1, rue Laurent Fries, BP 10142, 67404 Illkirch, France; Inserm, U964, Illkirch, France; CNRS, UMR7104, Illkirch, France; Université de Strasbourg, Strasbourg, France. Electronic address: patrick.schultz@igbmc.fr.
authors.forename: Patrick
authors.initials: P
authors.lastname: Schultz
mesh_terms: D000818:Animals; D017110:Freeze Substitution / Q000379:methods*; D006570:Heterochromatin / Q000648:ultrastructure; D051379:Mice; D008855:Microscopy, Electron, Scanning / Q000379:methods*; D028861:Nuclear Pore Complex Proteins / Q000648:ultrastructure; D012160:Retina / Q000648:ultrastructure*
chemical_list: D006570:Heterochromatin; D028861:Nuclear Pore Complex Proteins
keywords: FIB/SEM tomography; Heterochromatin; Nucleus; Segmentation