Journal article
Nuclear damage in LMNA mutant iPSC-derived cardiomyocytes is associated with impaired lamin localization to the nuclear envelope
Molecular biology of the cell, Vol.34(12), 113
11/01/2023
DOI: 10.1091/mbc.E21-10-0527
PMCID: PMC10846625
PMID: 37585285
Abstract
The LMNA gene encodes the nuclear envelope proteins Lamins A and C, which comprise a major part of the nuclear lamina, provide mechanical support to the nucleus, and participate in diverse intracellular signaling. LMNA mutations give rise to a collection of diseases called laminopathies, including dilated cardiomyopathy (LMNA-DCM) and muscular dystrophies. Although nuclear deformities are a hallmark of LMNA-DCM, the role of nuclear abnormalities in the pathogenesis of LMNA-DCM remains incompletely understood. Using induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) from LMNA mutant patients and healthy controls, we show that LMNA mutant iPSC-CM nuclei have altered shape or increased size compared to healthy control iPSC-CM nuclei. The LMNA mutation exhibiting the most severe nuclear deformities, R249Q, additionally caused reduced nuclear stiffness and increased nuclear fragility. Importantly, for all cell lines, the degree of nuclear abnormalities corresponded to the degree of Lamin A/C and Lamin B1 mislocalization from the nuclear envelope. The mislocalization was likely due to altered assembly of Lamin A/C. Collectively, these results point to the importance of correct lamin assembly at the nuclear envelope in providing mechanical stability to the nucleus and suggest that defects in nuclear lamina organization may contribute to the nuclear and cellular dysfunction in LMNA-DCM.
Details
- Title: Subtitle
- Nuclear damage in LMNA mutant iPSC-derived cardiomyocytes is associated with impaired lamin localization to the nuclear envelope
- Creators
- Melanie WallaceHind ZahrShriya PeratiChloé D MorsinkLindsey E JohnsonAnthony M GacitaShuping LaiLori L WallrathIvor J BenjaminElizabeth M McNallyTyler J KirbyJan Lammerding
- Resource Type
- Journal article
- Publication Details
- Molecular biology of the cell, Vol.34(12), 113
- DOI
- 10.1091/mbc.E21-10-0527
- PMID
- 37585285
- PMCID
- PMC10846625
- ISSN
- 1059-1524
- eISSN
- 1939-4586
- Language
- English
- Electronic publication date
- 08/16/2023
- Date published
- 11/01/2023
- Academic Unit
- Biochemistry and Molecular Biology; University College Courses
- Record Identifier
- 9984455947402771
Metrics
7 Record Views