Related Experiment Videos
Periodic breathing and genetics.
1Center for Sleep Disorders Research, Louis Stokes VA Medical Center, 111j(w) VAMC, Case Western Reserve University, 10701 East Blvd., Cleveland, OH 44106, USA. kpstrohl@aol.com
Respiratory Physiology & Neurobiology
|June 18, 2003
Summary
Genetic factors influence breathing instability in sleep apnea. Different mouse and rat strains show varying responses to hypoxia, suggesting a genetic predisposition to conditions like periodic breathing.
Area of Science:
- Genetics
- Respiratory Physiology
- Sleep Medicine
Background:
- Episodic fluctuations in breathing characterize sleep apnea syndromes.
- Periodic breathing (PB) and post-hypoxic frequency decline (PHFD) are breathing instabilities.
- Genetic variations influence resting ventilation and chemosensory responses.
Purpose of the Study:
- To investigate the role of genetic factors in ventilatory instability.
- To determine if genetic differences contribute to the risk of sleep apnea.
- To explore strain-specific responses to hypoxic challenges.
Main Methods:
- Utilized inbred mouse strains (C57BL/6J and A/J) for experiments.
- Exposed mice to brief hypoxic conditions to evoke breathing patterns.
- Compared ventilatory responses across different mouse and rat strains.
Main Results:
- Post-hypoxic frequency decline (PHFD) and periodic breathing (PB) were observed in C57BL/6J mice but not A/J mice after hypoxia.
- Significant differences in PHFD expression were noted between mouse strains.
- Variations in PHFD were also observed among different rat strains.
Conclusions:
- Genetic factors play a role in the expression of ventilatory instability.
- Strain-specific differences in breathing patterns suggest a genetic basis for susceptibility to sleep apnea.
- These findings support the hypothesis that genetics contribute to the risk of human sleep apnea syndromes.