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Title: Brg1 coordinates multiple processes during retinogenesis and is a tumor suppressor in retinoblastoma

Journal Article · · Development (Cambridge)
DOI:https://doi.org/10.1242/dev.124800· OSTI ID:1378673
 [1];  [2];  [3];  [1];  [3];  [1];  [3];  [4];  [5];  [5];  [6]
  1. St. Jude's Children's Research Hospital, Memphis, TN (United States). Dept. of Developmental Neurobiology
  2. Tokyo Medical and Dental Univ. (Japan). Center for Brain Integration Research
  3. St. Jude's Research Hospital, Memphis, TN (United States). Dept. of Computational Biology
  4. Univ. of Tennessee, Memphis, TN (United States). Health Science Center
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Genomics Division; USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  6. St. Jude's Children's Research Hospital, Memphis, TN (United States). Dept. of Developmental Neurobiology; Univ. of Tennessee, Memphis, TN (United States). Health Science Center; Howard Hughes Medical Inst., Chevy Chase, MD (United States)

Retinal development requires precise temporal and spatial coordination of cell cycle exit, cell fate specification, cell migration and differentiation. When this process is disrupted, retinoblastoma, a developmental tumor of the retina, can form. Epigenetic modulators are central to precisely coordinating developmental events, and many epigenetic processes have been implicated in cancer. Studying epigenetic mechanisms in development is challenging because they often regulate multiple cellular processes; therefore, elucidating the primary molecular mechanisms involved can be difficult. Here we explore the role of Brg1 (Smarca4) in retinal development and retinoblastoma in mice using molecular and cellular approaches. Brg1 was found to regulate retinal size by controlling cell cycle length, cell cycle exit and cell survival during development. Brg1 was not required for cell fate specification but was required for photoreceptor differentiation and cell adhesion/polarity programs that contribute to proper retinal lamination during development. The combination of defective cell differentiation and lamination led to retinal degeneration in Brg1-deficient retinae. Despite the hypocellularity, premature cell cycle exit, increased cell death and extended cell cycle length, retinal progenitor cells persisted in Brg1-deficient retinae, making them more susceptible to retinoblastoma. In conclusion, ChIP-Seq analysis suggests that Brg1 might regulate gene expression through multiple mechanisms.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1378673
Alternate ID(s):
OSTI ID: 1256950
Journal Information:
Development (Cambridge), Vol. 142, Issue 23; ISSN 0950-1991
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (6)

Inhibition of EZH2 induces NK cell-mediated differentiation and death in muscle-invasive bladder cancer journal January 2019
Epigenetic regulation of human retinoblastoma journal September 2016
Differential Expression of Sox11 and Bdnf mRNA Isoforms in the Injured and Regenerating Nervous Systems journal November 2017
Loss of BRG1 induces CRC cell senescence by regulating p53/p21 pathway journal February 2017
Structural changes of the macula and optic nerve head in the remaining eyes after enucleation for retinoblastoma: an optical coherence tomography study journal December 2017
Brg1 chromatin remodeling ATPase balances germ layer patterning by amplifying the transcriptional burst at midblastula transition journal May 2017

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