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ZFIN ID: ZDB-PUB-120802-10
Knockdown of Leptin A Expression Dramatically Alters Zebrafish Development
Liu, Q., Dalman, M., Chen, Y., Akhter, M., Brahmandam, S., Patel, Y., Lowe, J., Thakkar, M., Gregory, A.V., Phelps, D., Riley, C., and Londraville, R.L.
Date: 2012
Source: General and comparative endocrinology 178(3): 562-572 (Journal)
Registered Authors: Liu, Qin
Keywords: differentiation, central nervous system, metabolism, bone, auditory, visual
MeSH Terms:
  • Animals
  • Cell Differentiation/genetics
  • Cell Differentiation/physiology
  • Embryo, Nonmammalian/metabolism
  • Gene Expression Regulation, Developmental/physiology
  • Leptin/genetics
  • Leptin/metabolism*
  • Oligonucleotides, Antisense
  • Signal Transduction/genetics
  • Signal Transduction/physiology
  • Zebrafish/embryology
  • Zebrafish/genetics
  • Zebrafish/metabolism*
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/metabolism*
PubMed: 22841760 Full text @ Gen. Comp. Endocrinol.

Using morpholino antisense oligonucleotide (MO) technology, we blocked leptin A or leptin receptor expression in embryonic zebrafish, and analyzed consequences of leptin A knock-down on fish development. Embryos injected with leptin A or leptin receptor MOs (leptin A or leptin receptor morphants) had smaller bodies and eyes, undeveloped inner ear, enlarged pericardial cavity, curved body and/or tail and larger yolk compared to control embryos of the same stages. The defects persisted in 6–9 days old larvae. We found that blocking leptin A function had little effect on the development of early brain (1 day old), but differentiation of both the morphant dorsal brain and retinal cells was severely disrupted in older (2 days old) embryos. Despite the enlarged pericardial cavity, differentiation of cardiac cells appeared to be similar to control embryos. Formation of the morphants’ inner ear is also severely disrupted, which corroborates existing reports of leptin receptor expression in inner ear of both zebrafish and mammals. Co-injection of leptin A MO and recombinant leptin results in partial rescue of the wild-type phenotype. Our results suggest that leptin A plays distinct roles in zebrafish development.