ISL1-based LIM complexes control Slit2 transcription in developing cranial motor neurons

Kyung Tai Kim, Namhee Kim, Hwan Ki Kim, Hojae Lee, Hannah N. Gruner, Peter Gergics, Chungoo Park, Grant S. Mastick, Hae Chul Park, Mi Ryoung Song

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

LIM-homeodomain (HD) transcription factors form a multimeric complex and assign neuronal subtype identities, as demonstrated by the hexameric ISL1-LHX3 complex which gives rise to somatic motor (SM) neurons. However, the roles of combinatorial LIM code in motor neuron diversification and their subsequent differentiation is much less well understood. In the present study, we demonstrate that the ISL1 controls postmitotic cranial branchiomotor (BM) neurons including the positioning of the cell bodies and peripheral axon pathfinding. Unlike SM neurons, which transform into interneurons, BM neurons are normal in number and in marker expression in Isl1 mutant mice. Nevertheless, the movement of trigeminal and facial BM somata is stalled, and their peripheral axons are fewer or misrouted, with ectopic branches. Among genes whose expression level changes in previous ChIP-seq and microarray analyses in Isl1-deficient cell lines, we found that Slit2 transcript was almost absent from BM neurons of Isl1 mutants. Both ISL1-LHX3 and ISL1-LHX4 bound to the Slit2 enhancer and drove endogenous Slit2 expression in SM and BM neurons. Our findings suggest that combinations of ISL1 and LHX factors establish cell-type specificity and functional diversity in terms of motor neuron identities and/or axon development.

Original languageEnglish
Article number36491
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Nov 7

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'ISL1-based LIM complexes control Slit2 transcription in developing cranial motor neurons'. Together they form a unique fingerprint.

  • Cite this

    Kim, K. T., Kim, N., Kim, H. K., Lee, H., Gruner, H. N., Gergics, P., Park, C., Mastick, G. S., Park, H. C., & Song, M. R. (2016). ISL1-based LIM complexes control Slit2 transcription in developing cranial motor neurons. Scientific reports, 6, [36491]. https://doi.org/10.1038/srep36491