rhino-abstract.lyx 7.3 KB

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  89. \begin_layout Title
  90. Current Studies on Molecular Mechanisms of Iron Homeostasis in Rhinoceroses
  91. \end_layout
  92. \begin_layout Author
  93. Rose Linzmeier, Ph.D.1
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  97. Department of Pulmonary and Critical Care Medicine and Department of Pathology
  98. and Laboratory Medicine, UCLA School of Medicine, Los Angeles, CA 90095
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  108. Ryan Thompson2
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  112. Department of Molecular and Experimental Medicine, The Scripps Research
  113. Institute, La Jolla, CA 92037
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  123. Sarah LaMere, D.V.M
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  138. Pauline Lee, Ph.D.
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  153. Elizabeta Nemeth, Ph.D.
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  168. Tomas Ganz, M.D., Ph.D.
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  183. Donald E.
  184. Paglia, M.D.
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  188. UCLA Hematology Research Laboratory, Department of Pathology and Laboratory
  189. Medicine, UCLA School of Medicine, Los Angeles, CA 90095
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  192. \begin_inset Note Note
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  195. Look into https://tex.stackexchange.com/q/34746/5654
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  199. \begin_layout Date
  200. 2013
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  202. \begin_layout Standard
  203. Iron storage disease (ISD) is a hazardous and clinically underappreciated
  204. condition commonly acquired by exotic wildlife species when displaced from
  205. their natural habitats and confined for even short periods under artificial
  206. conditions.
  207. An international symposium recently reviewed and validated evidence that
  208. African black and Sumatran rhinoceroses invariably develop progressive
  209. ISD commensurate with their times in captivity, whereas African white and
  210. Indian rhinoceroses do not
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  216. .
  217. Since vulnerability to ISD is a species-wide characteristic, it is likely
  218. to have a genetic basis possibly reflecting evolutionary adaptions to differenc
  219. es in iron bioavailability between browser and grazer diets.
  220. \end_layout
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  222. As a biologically essential element that is also highly toxic in excess,
  223. iron is exquisitely regulated by molecular mechanisms primarily focused
  224. on interactions between the peptide hepcidin, (the principal iron-regulatory
  225. hormone), and its receptor ferroportin, (the sole channel for egress of
  226. intracellular iron into plasma)
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  232. .
  233. Iron-regulatory gene sequences from both ISD-susceptible and non-susceptible
  234. species were compared to search for possible molecular differences.
  235. DNA was extracted from peripheral blood samples from all four available
  236. rhinoceros species, and genes encoding hepcidin and ferroportin, as well
  237. as modulators hemojuvelin, transferrin receptor 2, and HFE protein, were
  238. cloned and analyzed by PCR amplification.
  239. Over half of the DNA sequences of these five genes have now been determined
  240. without identifying any that could account for disparities in iron loading
  241. among the species.
  242. Evaluation of the remaining sequences continues, as do studies to determine
  243. the responsiveness of rhinoceros ferroportin to hepcidin modulation and
  244. quantitative levels of hepcidin expression
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  253. In addition, liver and spleen mRNA sequences from African black and white
  254. rhinoceroses were assembled using Trinity RNA-Seq software
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  260. and compared with human sequences using the SIFT algorithm
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  266. .
  267. Candidate single-nucleotide polymorphisms were independently validated
  268. by genomic sequencing.
  269. Mutations were found in four genes that may be associated with primary
  270. iron disorders or hemolytic anemia in black rhinoceroses: SLC28a2, EPB41,
  271. MTF1, and STEAP4
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  277. .
  278. The functional consequences of these mutations are being determined.
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