A mouse model of BBS identifies developmental and homeostatic effects of BBS5 mutation and identifies novel pituitary abnormalities
| Autor: | Mandy J. Croyle, Reagan S Andersen, Nicolas F. Berbari, Staci E. Engle, Addison Rains, Kelsey R. Clearman, Bradley K. Yoder, Melissa R Bentley-Ford, Courtney J. Haycraft |
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| Rok vydání: | 2021 |
| Předmět: |
Male
0301 basic medicine BBSome BBS5 Biology Ciliopathies Mice 03 medical and health sciences 0302 clinical medicine Genetics medicine Animals Allele Bardet-Biedl Syndrome Molecular Biology Genetics (clinical) Cilium General Medicine Phosphate-Binding Proteins medicine.disease Null allele Cell biology Cytoskeletal Proteins Disease Models Animal Ciliopathy Phenotype 030104 developmental biology Membrane protein Pituitary Gland Mutation General Article 030217 neurology & neurosurgery |
| Zdroj: | Hum Mol Genet |
| ISSN: | 1460-2083 0964-6906 |
| Popis: | Primary cilia are critical sensory and signaling compartments present on most mammalian cell types. These specialized structures require a unique signaling protein composition relative to the rest of the cell to carry out their functions. Defects in ciliary structure and signaling result in a broad group of disorders collectively known as ciliopathies. One ciliopathy, Bardet–Biedl syndrome (BBS; OMIM 209900), presents with diverse clinical features, many of which are attributed to defects in ciliary signaling during both embryonic development and postnatal life. For example, patients exhibit obesity, polydactyly, hypogonadism, developmental delay and skeletal abnormalities along with sensory and cognitive deficits, but for many of these phenotypes it is uncertain, which are developmental in origin. A subset of BBS proteins assembles into the core BBSome complex, which is responsible for mediating transport of membrane proteins into and out of the cilium, establishing it as a sensory and signaling hub. Here, we describe two new mouse models for BBS resulting from a targeted LacZ gene trap allele (Bbs5−/−) that is a predicted congenital null mutation and conditional (Bbs5flox/flox) allele of Bbs5. Bbs5−/− mice develop a complex phenotype consisting of increased pre-weaning lethality craniofacial and skeletal defects, ventriculomegaly, infertility and pituitary anomalies. Utilizing the conditional allele, we show that the male fertility defects, ventriculomegaly and pituitary abnormalities are only present when Bbs5 is disrupted prior to postnatal day 7, indicating a developmental origin. In contrast, mutation of Bbs5 results in obesity, independent of the age of Bbs5 loss. |
| Databáze: | OpenAIRE |
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