Lamin A/C is expressed in pluripotent mouse embryonic stem cells

MA Eckersley-Maslin, JH Bergmann, Z Lazar… - Nucleus, 2013 - Taylor & Francis
Nucleus, 2013Taylor & Francis
The pluripotent nature of embryonic stem cells (ESC) is associated with a dynamic open
chromatin state and an irregular nuclear shape. It has been postulated that the absence of
Lamin A/C contributes to these features. However, we show that mouse ESCs express low,
yet readily detectable, amounts of Lamin A/C at both the RNA and protein levels. Full-length
transcripts of both isoforms were readily detected by q-PCR and deep RNA sequencing.
Additionally, protein expression was validated in multiple primary and established ESC lines …
The pluripotent nature of embryonic stem cells (ESC) is associated with a dynamic open chromatin state and an irregular nuclear shape. It has been postulated that the absence of Lamin A/C contributes to these features. However, we show that mouse ESCs express low, yet readily detectable, amounts of Lamin A/C at both the RNA and protein levels. Full-length transcripts of both isoforms were readily detected by q-PCR and deep RNA sequencing. Additionally, protein expression was validated in multiple primary and established ESC lines by immunoblotting using several independent antibodies. Immunofluorescence labeling showed localization of Lamin A/C at the nuclear periphery of all Oct4/Nanog double-positive ESC lines examined, as well as in the inner cell mass of blastocysts. Our results demonstrate ESCs do express low levels of Lamin A/C, thus models linking pluripotency and nuclear dynamics with the absence of Lamin A/C need to be revisited.
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