Quantitative analysis of nuclear pore complex organization in Schizosaccharomyces pombe

Author:

Varberg Joseph M1ORCID,Unruh Jay R1,Bestul Andrew J1,Khan Azqa A1ORCID,Jaspersen Sue L12ORCID

Affiliation:

1. Stowers Institute for Medical Research, Kansas City, MO, USA

2. Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, KS, USA

Abstract

The number, distribution, and composition of nuclear pore complexes (NPCs) in the nuclear envelope varies between cell types and changes during cellular differentiation and in disease. To understand how NPC density and organization are controlled, we analyzed the NPC number and distribution in the fission yeast Schizosaccharomyces pombe using structured illumination microscopy. The small size of yeast nuclei, genetic features of fungi, and our robust image analysis pipeline allowed us to study NPCs in intact nuclei under multiple conditions. Our data revealed that NPC density is maintained across a wide range of nuclear sizes. Regions of reduced NPC density are observed over the nucleolus and surrounding the spindle pole body (SPB). Lem2-mediated tethering of the centromeres to the SPB is required to maintain NPC exclusion near SPBs. These findings provide a quantitative understanding of NPC number and distribution in S. pombe and show that interactions between the centromere and the nuclear envelope influences local NPC distribution.

Funder

Stowers Institute for Medical Research and NIH-NIGMS

NIH-NIGMS

Publisher

Life Science Alliance, LLC

Subject

Health, Toxicology and Mutagenesis,Plant Science,Biochemistry, Genetics and Molecular Biology (miscellaneous),Ecology

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