Proteomics

Dataset Information

1

Spodoptera frugiperda kinetochore co-immunoprecipitations


ABSTRACT: Accurate chromosome segregation requires assembly of the multiprotein kinetochore complex at centromeres. In most eukaryotes, kinetochore assembly is primed by the histone H3 variant CenH3, which physically interacts with components of the inner kinetochore constitutive-centromere-associated-network (CCAN). Unexpected to its critical function, previous work identified that select eukaryotic lineages, including several insects, have lost CenH3, while having retained homologs of the CCAN. These findings imply alternative CCAN assembly pathways in these organisms that function in CenH3-independent manners. Here, we study the composition and assembly of CenH3-independent kinetochores of Lepidoptera. We show that lepidopteran kinetochores consist of previously identified CCAN homologs as well as additional components including a divergent CENP-T homolog, which are required for accurate mitotic progression. Our study focuses on CENP-T that we find both necessary and sufficient to recruit the Mis12 outer kinetochore complex. In addition, CRISPR-mediated gene editing in Bombyx mori establishes an essential function of CENP-T in vivo. Finally, the retention of CENP-T homologs in other independently-derived CenH3-deficient insects indicates a conserved mechanism of kinetochore assembly between these lineages. Our study provides the first functional insights into CCAN-based kinetochore assembly pathways that function independently of CenH3, thus contributing to the emerging picture of an unexpected plasticity to build a kinetochore.

INSTRUMENT(S): Q Exactive HF-X, Orbitrap Fusion

ORGANISM(S): Bombyx mori   Spodoptera frugiperda  

TISSUE(S): Tissue Not Applicable To Dataset

DISEASE(S): Not Available

SUBMITTER: Valentin SABATET  

LAB HEAD: Damarys Loew

PROVIDER: PXD016092 | Pride | 2020-02-18

REPOSITORIES: pride

altmetric image

Publications

CenH3-Independent Kinetochore Assembly in Lepidoptera Requires CCAN, Including CENP-T.

Cortes-Silva Nuria N   Ulmer Jonathan J   Kiuchi Takashi T   Hsieh Emily E   Cornilleau Gaetan G   Ladid Ilham I   Dingli Florent F   Loew Damarys D   Katsuma Susumu S   Drinnenberg Ines A IA  

Current biology : CB 20200206 4


Accurate chromosome segregation requires assembly of the multiprotein kinetochore complex at centromeres. In most eukaryotes, kinetochore assembly is primed by the histone H3 variant CenH3 (also called CENP-A), which physically interacts with components of the inner kinetochore constitutive centromere-associated network (CCAN). Unexpectedly, regarding its critical function, previous work identified that select eukaryotic lineages, including several insects, have lost CenH3 while having retained  ...[more]

Similar Datasets

1000-01-01 | S-EPMC3085131 | BioStudies
1000-01-01 | S-EPMC3175311 | BioStudies
2009-01-01 | S-EPMC2754938 | BioStudies
2019-01-01 | S-EPMC6781445 | BioStudies
2014-01-01 | S-EPMC4080450 | BioStudies
1000-01-01 | S-EPMC3364751 | BioStudies
1000-01-01 | S-EPMC4137059 | BioStudies
1000-01-01 | S-EPMC1934396 | BioStudies
2015-01-01 | S-EPMC4494010 | BioStudies
2007-01-01 | S-EPMC2064049 | BioStudies