Abstract:
:ADP-ribosylation factor-like 4aa (Arl4aa) is a member of the ADP-ribosylation factor family. It is expressed in hematopoietic tissue during embryonic development, but its function was unknown. Zebrafish arl4aa is preferentially expressed in the ventral wall of the dorsal aorta (VDA) at 24 and 36 hpf and in caudal hematopoietic tissue at 48 hpf. Morpholino knockdown and transcription activator-like effector nuclease (TALEN) knockout of arl4aa significantly reduced expression of genes associated with definitive hematopoietic stem cells (HSCs). Golgi complex integrity in VDA was disrupted as shown by transmission electron microscopy and immunostaining of Golgi membrane Giantin. Mechanistically, arl4aa knockdown reduced Notch signaling in the VDA and its target gene expression. Protein expression of NICD was also reduced. Effects of arl4aa knockdown on definitive hematopoiesis could be restored by NICD expression. This study identified arl4aa as a factor regulating initiation of definitive HSCs by maintaining the integrity of Golgi complex and, secondarily, maturation of the Notch receptor.
journal_name
Stem Cell Reportsjournal_title
Stem cell reportsauthors
Guo Y,Cheng BYL,Wang D,Ma ACH,He BL,Man TK,Cheung MPL,Shi X,Ng NKL,Leung AYHdoi
10.1016/j.stemcr.2020.02.012subject
Has Abstractpub_date
2020-04-14 00:00:00pages
575-589issue
4issn
2213-6711pii
S2213-6711(20)30068-0journal_volume
14pub_type
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