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<p>Regenerative capacity varies widely across tissues and species. Most regeneration studies have focused on identifying genes and pathways that promote regeneration, whereas mechanisms that inhibit regeneration to enforce organ size control and prevent excessive proliferation remain less well defined. Here, we identify <i>isl1a</i> as a dynamically expressed negative regulator of lateral line hair cell regeneration. <i>isl1a</i> is highly expressed during homeostasis but becomes transiently downregulated following hair cell loss. Loss of <i>isl1a</i> leads to proliferative expansion of support cells, producing enlarged sensory organs with increased hair cell numbers after injury. Mechanistically, <i>isl1a</i> downregulation increases chromatin accessibility at pro-proliferative loci, including AP-1 transcription factors, accompanied by sustained expression of injury- and regeneration-responsive genes. Together, these findings demonstrate that injury-induced downregulation of <i>isl1a</i> promotes the initiation of regeneration, while its subsequent re-expression restricts the duration of the response, thereby fine-tuning hair cell regeneration and maintaining appropriate support cell numbers.</p>

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isl1a coordinates onset and termination of regeneration of the zebrafish lateral line

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月1日

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  • Paloma Meneses-Giles,
  • Kaelan J. Brennan,
  • Nhung T. T. Tran,
  • Aurélie Hintermann,
  • Mark E. Lush,
  • Tatjana Piotrowski

摘要

Regenerative capacity varies widely across tissues and species. Most regeneration studies have focused on identifying genes and pathways that promote regeneration, whereas mechanisms that inhibit regeneration to enforce organ size control and prevent excessive proliferation remain less well defined. Here, we identify isl1a as a dynamically expressed negative regulator of lateral line hair cell regeneration. isl1a is highly expressed during homeostasis but becomes transiently downregulated following hair cell loss. Loss of isl1a leads to proliferative expansion of support cells, producing enlarged sensory organs with increased hair cell numbers after injury. Mechanistically, isl1a downregulation increases chromatin accessibility at pro-proliferative loci, including AP-1 transcription factors, accompanied by sustained expression of injury- and regeneration-responsive genes. Together, these findings demonstrate that injury-induced downregulation of isl1a promotes the initiation of regeneration, while its subsequent re-expression restricts the duration of the response, thereby fine-tuning hair cell regeneration and maintaining appropriate support cell numbers.