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Fishing for Answers: Investigating Fibrodysplasia Ossificans Progressiva Using a Novel Adult Zebrafish Model
Başlık:
Fishing for Answers: Investigating Fibrodysplasia Ossificans Progressiva Using a Novel Adult Zebrafish Model
Yazar:
LaBonty, Melissa, author.
ISBN:
9780438031029
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (107 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Advisors: Pamela C. Yelick Committee members: Aris Economides; Laura Liscum; Leif Oxburgh; Clifford Rosen.
Özet:
Fibrodysplasia Ossificans Progressiva (FOP) is a rare, autosomal dominant genetic disorder in humans characterized by the gradual ossification of fibrous tissues, including skeletal muscle, tendons, and ligaments. In humans, activating mutations in the Type I BMP/TGFbeta family member receptor, ACVR1, are associated with FOP. Zebrafish acvr1l, previously known as alk8, is the functional ortholog of human ACVR1. The objective of this work is to create and characterize the first adult zebrafish model for FOP, providing a useful tool to study the development and progression of FOP-like symptoms. Constitutively active mutations in zebrafish acvr1l cause early lethal defects. Therefore, to study roles for activating acvr1l mutations in adult zebrafish, gateway cloning was used to create a vector containing the hsp70l heat shock promoter driving the expression of mCherry-tagged constitutively active Acvr1l (Q204D). Constructs were injected into single cell stage BMP response element reporter (Bre:GFP) zebrafish to create stable Tg(Bre:GFP); Tg(hsp70l:acvr1l_Q204D-mCherry) lines. Beginning at 2 weeks post fertilization, developmentally staged transgenic animals were subjected to daily one-hour heat shock treatments (3 weeks to 12 months) to induce Acvr1lQ204D expression. Micro-CT was used on whole animals to confirm FOP-like skeletal defects. Acvr1lQ204D -expressing animals displayed HO formation, abnormal spinal curvature, vertebral fusions, and malformation of pelvic fins, as compared to heat shocked Tg(Bre:GFP) animals and non-heat shocked controls. Histological stains (Safranin O and Hall and Brunt's Quadruple Stain) were used to confirm the presence of cartilaginous proteoglycans and mineralized tissue formation in the HO lesions. As injury is a known trigger for HO development in human FOP patients, several injury models were tested on Acvr1lQ204D-expressing animals to induce the formation of reliable, replicable HO. Activin A injection, cardiotoxin injection, and caudal fin clip injuries were all developed. None of these methods resulted in HO formation at the site of injury. However, cardiotoxin injected and caudal fin clipped animals did develop HO at distant sties, including the body cavity and along the spine. In summary, these results suggest that heat-shocked Acvr1lQ204D-expressing adult zebrafish provide an informative model for human FOP, but further work is needed to identify an effective method for inducing reliable site-directed HO.
Notlar:
School code: 0845
Mevcut:*
Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(678391.1) | 678391-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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