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Immunolocalisation of the D-melanogaster Nramp homologue Malvolio to gut and Malpighian tubules provides evidence that Malvolio and Nramp2 are orthologous

Folwell, James L., Barton, C. Howard and Shepherd, David (2006) Immunolocalisation of the D-melanogaster Nramp homologue Malvolio to gut and Malpighian tubules provides evidence that Malvolio and Nramp2 are orthologous Journal of Experimental Biology, 209, (10), pp. 1988-1995. (doi:10.1242/jeb.02193).

Record type: Article


Nramp (Slc11a1) genes in mammals are associated with the transport of iron and other divalent cations; Nramp1 in macrophages involved in the innate immune response against intracellular pathogens, and Nramp2 with duodenal iron uptake and the transferrin–transferrin-receptor pathway of iron assimilation. The Drosophila melanogaster Nramp-related gene is known as Malvolio. The localisation of Malvolio protein was inferred from the enhancer trap line initially used to isolate Malvolio in a screen for mutants with defects in taste perception. Here we describe the generation of a Malvolio-reactive polyclonal antibody and apply it to evaluate Malvolio localisation during stages of D. melanogaster development, and compare the results with the localisation of the enhancer trap line identified with beta-galactosidase. All immunolocalisation studies have been confirmed to be specific with Malvolio-blocking peptides. Our results demonstrated expression within Malpighian tubules, testis, brain, the amnioserosa of embryos, the larval and adult alimentary canal. Expression within the gut was of significant interest, as mammalian Nramp2 in the gut plays a primary role in the acquisition of dietary iron. We confirm expression within the central nervous system and in cells of the haematopoietic system. By immunohistochemistry we showed that expression within cells was either punctuate, diffuse cytoplasmic or plasma membrane associated, or both. The staining within the gut indicates a degree of conservation of components for iron acquisition between flies and mammals, suggesting that a comparable mechanism has been retained during evolution.

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Published date: 1 May 2006
Keywords: Nramp, divalent cation transport, Drosophila melanogaster, innate immunity, brain, haemocyte, Malpighian tubule, gut cell


Local EPrints ID: 56816
ISSN: 0022-0949
PURE UUID: dba80c98-c50b-4700-ad2b-42dafbb24595
ORCID for David Shepherd: ORCID iD

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Date deposited: 08 Aug 2008
Last modified: 17 Jul 2017 14:30

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Author: James L. Folwell
Author: David Shepherd ORCID iD

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