Disruption of the Flnb gene in mice phenocopies the human disease spondylocarpotarsal synostosis syndrome
| Autor: | Claire Farrington-Rock, Matthew J. Rock, Veneta T. Kirilova, Deborah Krakow, Lisa Dillard-Telm, Alexander D. Borowsky, Daniel H. Cohn, Sara Chalk |
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| Rok vydání: | 2007 |
| Předmět: |
Pathology
Filamin Compound heterozygosity Mice Vertebral fusion Contractile Proteins FLNB Genetics (clinical) Mice Knockout Homozygote Microfilament Proteins Gene Expression Regulation Developmental General Medicine Anatomy Syndrome Phenotype Synostosis Codon Nonsense medicine.symptom Metacarpus Dimerization medicine.medical_specialty Heterozygote Filamins Nonsense mutation Genes Recessive Biology Osteochondrodysplasias Short stature Models Biological Article Genetics medicine Animals Humans Abnormalities Multiple Molecular Biology Crosses Genetic Phenocopy Models Genetic medicine.disease Embryo Mammalian Spine Protein Structure Tertiary body regions Mice Inbred C57BL Molecular Weight Disease Models Animal Animals Newborn Mutation Ankle |
| Zdroj: | Human molecular genetics. 17(5) |
| ISSN: | 1460-2083 |
| Popis: | Spondylocarpotarsal synostosis syndrome (SCT) is an autosomal recessive disease that is characterized by short stature, and fusions of the vertebrae and carpal and tarsal bones. SCT results from homozygosity or compound heterozygosity for nonsense mutations in FLNB. FLNB encodes filamin B, a multifunctional cytoplasmic protein that plays a critical role in skeletal development. Protein extracts derived from cells of SCT patients with nonsense mutations in FLNB did not contain filamin B, demonstrating that SCT results from absence of filamin B. To understand the role of filamin B in skeletal development, an Flnb-/- mouse model was generated. The Flnb-/- mice were phenotypically similar to individuals with SCT as they exhibited short stature and similar skeletal abnormalities. Newborn Flnb-/- mice had fusions between the neural arches of the vertebrae in the cervical and thoracic spine. At postnatal day 60, the vertebral fusions were more widespread and involved the vertebral bodies as well as the neural arches. In addition, fusions were seen in sternum and carpal bones. Analysis of the Flnb-/- mice phenotype showed that an absence of filamin B causes progressive vertebral fusions, which is contrary to the previous hypothesis that SCT results from failure of normal spinal segmentation. These findings suggest that spinal segmentation can occur normally in the absence of filamin B, but the protein is required for maintenance of intervertebral, carpal and sternal joints, and the joint fusion process commences antenatally. |
| Databáze: | OpenAIRE |
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