| Autor: |
Weining, Yin, Alessandra, Livraghi-Butrico, Patrick R, Sears, Troy D, Rogers, Kimberlie A, Burns, Barbara R, Grubb, Lawrence E, Ostrowski |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Am J Respir Cell Mol Biol |
| ISSN: |
1535-4989 |
| Popis: |
Primary ciliary dyskinesia (PCD) is a genetically and phenotypically heterogeneous disease caused by mutations in over 40 different genes. Individuals with PCD caused by mutations in RSPH1 (radial spoke head 1 homolog) have been reported to have a milder phenotype than other individuals with PCD, as evidenced by a lower incidence of neonatal respiratory distress, higher nasal nitric oxide concentrations, and better lung function. To better understand genotype–phenotype relationships in PCD, we have characterized a mutant mouse model with a deletion of Rsph1. Approximately 50% of cilia from Rsph1(−/−) cells appeared normal by transmission EM, whereas the remaining cilia revealed a range of defects, primarily transpositions or a missing central pair. Ciliary beat frequency in Rsph1(−/−) cells was significantly lower than in control cells (20.2 ± 0.8 vs. 25.0 ± 0.9 Hz), and the cilia exhibited an aberrant rotational waveform. Young Rsph1(−/−) animals demonstrated a low rate of mucociliary clearance in the nasopharynx that was reduced to zero by about 1 month of age. Rsph1(−/−) animals accumulated mucus in the nasal cavity but had a lower bacterial burden than animals with a deletion of dynein axonemal intermediate chain 1 (Dnaic1(−/−)). Thus, Rsph1(−/−) mice display a PCD phenotype similar to but less severe than that observed in Dnaic1(−/−) mice, similar to what has been observed in humans. The results suggest that some individuals with PCD may not have a complete loss of mucociliary clearance and further suggest that early diagnosis and intervention may be important to maintain this low amount of clearance. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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