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Genetic control of differential baseline breathing pattern

C G Tankersley1, R S Fitzgerald, R C Levitt

  • 1Department of Environmental Health Sciences, Johns Hopkins University, Baltimore, Maryland 21205, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 1, 1997
PubMed
Summary

Genetic factors influence breathing patterns. This study reveals that at least two genetic loci control breathing frequency and inspiratory time in mice, impacting respiratory timing differences between strains.

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Area of Science:

  • Genetics
  • Physiology
  • Respiratory Biology

Background:

  • Distinct breathing patterns exist between inbred mouse strains, such as the rapid, shallow breathing of C57BL/6J (B6) and the slow, deep breathing of C3H/HeJ (C3).
  • Understanding the genetic basis of these physiological differences is crucial for respiratory research.

Purpose of the Study:

  • To determine the genetic control of baseline breathing patterns.
  • To investigate the mode of inheritance for breathing frequency (f), tidal volume, and inspiratory time (TI) between B6 and C3 mouse strains.

Main Methods:

  • Whole body plethysmography was used to measure f, tidal volume, and TI in progenitor strains and their progeny.
  • Segregation analyses were performed on segregant and nonsegregant progeny.
  • BXH recombinant inbred (RI) strains were analyzed to establish strain distribution patterns.

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Main Results:

  • Breathing frequency (f) and inspiratory time (TI) showed consistent differences between the B6 and C3 progenitor strains.
  • Segregation analyses suggest a two-locus genetic model for the inheritance of f and TI.
  • Analysis of BXH RI strains revealed parental phenotypes and intermediate variations, supporting polygenic control.

Conclusions:

  • The phenotypic differences in baseline respiratory timing between male B6 and C3 mice are primarily determined by at least two genetic loci.
  • This study provides a genetic model for respiratory timing, essential for future research into respiratory control mechanisms.