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Mitotic Defects Lead to Pervasive Aneuploidy and Accompany Loss of RB1 Activity in Mouse Lmna(Dhe) Dermal Fibroblasts
BACKGROUND: Lamin A (LMNA) is a component of the nuclear lamina and is mutated in several human diseases, including Emery-Dreifuss muscular dystrophy (EDMD; OMIM ID# 181350) and the premature aging syndrome Hutchinson-Gilford progeria syndrome (HGPS; OMIM ID# 176670). Cells from progeria patients ex...
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Formato: | Texto |
Lenguaje: | English |
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Public Library of Science
2011
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3064591/ https://www.ncbi.nlm.nih.gov/pubmed/21464947 http://dx.doi.org/10.1371/journal.pone.0018065 |
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author | Pratt, C. Herbert Curtain, Michelle Donahue, Leah Rae Shopland, Lindsay S. |
author_facet | Pratt, C. Herbert Curtain, Michelle Donahue, Leah Rae Shopland, Lindsay S. |
author_sort | Pratt, C. Herbert |
collection | PubMed |
description | BACKGROUND: Lamin A (LMNA) is a component of the nuclear lamina and is mutated in several human diseases, including Emery-Dreifuss muscular dystrophy (EDMD; OMIM ID# 181350) and the premature aging syndrome Hutchinson-Gilford progeria syndrome (HGPS; OMIM ID# 176670). Cells from progeria patients exhibit cell cycle defects in both interphase and mitosis. Mouse models with loss of LMNA function have reduced Retinoblastoma protein (RB1) activity, leading to aberrant cell cycle control in interphase, but how mitosis is affected by LMNA is not well understood. RESULTS: We examined the cell cycle and structural phenotypes of cells from mice with the Lmna allele, Disheveled hair and ears (Lmna(Dhe)). We found that dermal fibroblasts from heterozygous Lmna(Dhe) (Lmna(Dhe/+)) mice exhibit many phenotypes of human laminopathy cells. These include severe perturbations to the nuclear shape and lamina, increased DNA damage, and slow growth rates due to mitotic delay. Interestingly, Lmna(Dhe/+) fibroblasts also had reduced levels of hypophosphorylated RB1 and the non-SMC condensin II-subunit D3 (NCAP-D3), a mitosis specific centromere condensin subunit that depends on RB1 activity. Mitotic check point control by mitotic arrest deficient-like 1 (MAD2L1) also was perturbed in Lmna(Dhe) (/+) cells. Lmna(Dhe) (/+) fibroblasts were consistently aneuploid and had higher levels of micronuclei and anaphase bridges than normal fibroblasts, consistent with chromosome segregation defects. CONCLUSIONS: These data indicate that RB1 may be a key regulator of cellular phenotype in laminopathy-related cells, and suggest that the effects of LMNA on RB1 include both interphase and mitotic cell cycle control. |
format | Text |
id | pubmed-3064591 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-30645912011-04-04 Mitotic Defects Lead to Pervasive Aneuploidy and Accompany Loss of RB1 Activity in Mouse Lmna(Dhe) Dermal Fibroblasts Pratt, C. Herbert Curtain, Michelle Donahue, Leah Rae Shopland, Lindsay S. PLoS One Research Article BACKGROUND: Lamin A (LMNA) is a component of the nuclear lamina and is mutated in several human diseases, including Emery-Dreifuss muscular dystrophy (EDMD; OMIM ID# 181350) and the premature aging syndrome Hutchinson-Gilford progeria syndrome (HGPS; OMIM ID# 176670). Cells from progeria patients exhibit cell cycle defects in both interphase and mitosis. Mouse models with loss of LMNA function have reduced Retinoblastoma protein (RB1) activity, leading to aberrant cell cycle control in interphase, but how mitosis is affected by LMNA is not well understood. RESULTS: We examined the cell cycle and structural phenotypes of cells from mice with the Lmna allele, Disheveled hair and ears (Lmna(Dhe)). We found that dermal fibroblasts from heterozygous Lmna(Dhe) (Lmna(Dhe/+)) mice exhibit many phenotypes of human laminopathy cells. These include severe perturbations to the nuclear shape and lamina, increased DNA damage, and slow growth rates due to mitotic delay. Interestingly, Lmna(Dhe/+) fibroblasts also had reduced levels of hypophosphorylated RB1 and the non-SMC condensin II-subunit D3 (NCAP-D3), a mitosis specific centromere condensin subunit that depends on RB1 activity. Mitotic check point control by mitotic arrest deficient-like 1 (MAD2L1) also was perturbed in Lmna(Dhe) (/+) cells. Lmna(Dhe) (/+) fibroblasts were consistently aneuploid and had higher levels of micronuclei and anaphase bridges than normal fibroblasts, consistent with chromosome segregation defects. CONCLUSIONS: These data indicate that RB1 may be a key regulator of cellular phenotype in laminopathy-related cells, and suggest that the effects of LMNA on RB1 include both interphase and mitotic cell cycle control. Public Library of Science 2011-03-25 /pmc/articles/PMC3064591/ /pubmed/21464947 http://dx.doi.org/10.1371/journal.pone.0018065 Text en Pratt et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. |
spellingShingle | Research Article Pratt, C. Herbert Curtain, Michelle Donahue, Leah Rae Shopland, Lindsay S. Mitotic Defects Lead to Pervasive Aneuploidy and Accompany Loss of RB1 Activity in Mouse Lmna(Dhe) Dermal Fibroblasts |
title | Mitotic Defects Lead to Pervasive Aneuploidy and Accompany Loss of RB1 Activity in Mouse Lmna(Dhe) Dermal Fibroblasts |
title_full | Mitotic Defects Lead to Pervasive Aneuploidy and Accompany Loss of RB1 Activity in Mouse Lmna(Dhe) Dermal Fibroblasts |
title_fullStr | Mitotic Defects Lead to Pervasive Aneuploidy and Accompany Loss of RB1 Activity in Mouse Lmna(Dhe) Dermal Fibroblasts |
title_full_unstemmed | Mitotic Defects Lead to Pervasive Aneuploidy and Accompany Loss of RB1 Activity in Mouse Lmna(Dhe) Dermal Fibroblasts |
title_short | Mitotic Defects Lead to Pervasive Aneuploidy and Accompany Loss of RB1 Activity in Mouse Lmna(Dhe) Dermal Fibroblasts |
title_sort | mitotic defects lead to pervasive aneuploidy and accompany loss of rb1 activity in mouse lmna(dhe) dermal fibroblasts |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3064591/ https://www.ncbi.nlm.nih.gov/pubmed/21464947 http://dx.doi.org/10.1371/journal.pone.0018065 |
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