Embryonic expression profile of chicken Chd7, the ortholog of the causative gene for CHARGE syndrome

Michihiko Aramaki, Tokuhiro Kimura, Toni Udaka, Rika Kosaki, Takayuki Mitsuhashi, Yasunori Okada, Takao Takahashi, Kenjiro Kosaki

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

BACKGROUND: CHARGE syndrome represents a constellation of malformations: C, coloboma of the iris or retina; H, heart defects; A, atresia of the choanae; R, retardation of growth and/or development; G, genital anomalies; and E, ear abnormalities. Recently, the Chromodomain helicase DNA-binding protein-7 (CHD7) at chromosome 8q12.1 was identified as a causative gene for CHARGE syndrome. Because CHD7 was identified as a causative gene using a positional cloning approach, the role of CHD7 in early embryogenesis needs to be further investigated. METHODS: Fertilized chick eggs were incubated to Hamburger and Hamilton stages 4-20 and were studied using whole mount in situ hybridization. Chicken EST clones corresponding to the chicken CHD7 (cChd7) sequence were identified using the chicken EST sequence database. From the EST clones, a digoxigenin-labeled RNA probe was synthesized and hybridized in situ to the embryonic specimens. RESULTS: The expression of cChd7 was pan-neuronal at stages 8-20. It was expressed throughout the rostral neural ectoderm and along the rostrocaudal axis but was absent from the more lateral, non-neuronal ectoderm. Adjacent to the neural tube, cChd7 transcripts were detected at the optic and otic placodes. At stage 20, cChd7 expression was observed in the branchial arches and olfactory placodes in addition to brain and optic and otic placodes. CONCLUSIONS: cChd7 was expressed in the neural epithelium, the otic placodes, the optic placodes, the branchial arches, and the olfactory placodes, which are the primordial tissues that give rise to organs affected in human CHARGE syndrome patients.

Original languageEnglish
Pages (from-to)50-57
Number of pages8
JournalBirth Defects Research Part A - Clinical and Molecular Teratology
Volume79
Issue number1
DOIs
Publication statusPublished - 2007 Jan

Keywords

  • CHARGE syndrome
  • CHD7
  • Comparative genomics
  • In situ hybridization
  • Multiple malformation syndromes

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Embryology
  • Developmental Biology

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