Details

Autor(en) / Beteiligte

• Willse, Alan
• Belcher, Anne M
• Preti, George
• Wahl, Jon H
• Thresher, Miranda
• Yang, Peter
• Yamazaki, Kunio
• Beauchamp, Gary K

Titel

Identification of Major Histocompatibility Complex-Regulated Body Odorants by Statistical Analysis of a Comparative Gas Chromatography/Mass Spectrometry Experiment

Ist Teil von

• Analytical chemistry (Washington), 2005-04, Vol.77 (8), p.2348-2361

Ort / Verlag

Washington, DC: American Chemical Society

Erscheinungsjahr

2005

Quelle

MEDLINE

Beschreibungen/Notizen

• This paper examines the application of gas chromatography/mass spectrometry (GC/MS) in a comparative experiment to identify volatile compounds from urine that differ in concentration between two groups of inbred mice. A complex mixture might comprise several hundred or even thousands of volatile compounds. Because their number and location in a chromatogram are generally unknown, and because components overlap in populous chromatograms, the statistical problems offer significant challenges beyond traditional two-group screening procedures. We describe a statistical procedure to compare two-dimensional GC/MS profiles between groups, which entails (1) signal processing, baseline correction, and peak detection in single ion chromatograms; (2) aligning chromatograms in time; (3) normalizing differences in overall signal intensities; and (4) detecting chromatographic regions that differ between groups. In an application to chemosignaling, we detect differences in GC/MS chromatograms of ether-extracted urine collected from two inbred groups of mice that differ only in genes of the major histocompatibility complex (MHC). Several dozen MHC-regulated compounds are found, including two known mouse pheromones, 2,5-dimethylpyrazine and 2-sec-butyl-4,5-dihydrothiazole.