体重選抜ウズラ系統におけるＤＮＡフィンガープリント像による遺伝的構造の分析

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タイトル別名
  • DNA Fingerprints of Japanese Quail Lines Selected for High and Low Body Weight.
  • タイジュウ センバツ ウズラ ケイトウ ニ オケル DNA フィンガー プリン

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During past three decades, OKAMOTO has maintained quail lines selecting for large and small size. Those lines have been already maintained over 60 generations. Body size is distinctly different between the lines as well as some physiological traits. At 10-week-old, average body weight of large (LL) line is 3.3 times that of small (SS) line. The SS line shows higher values in muscle protein turnover rate, skeletal muscle proteinase activity, oxygen consumption, body temperature and carbonic acid production. Despite these distinct differences between lines, the degree of differentiation estimated from genetic distance based on gene frequencies at several polymorphic protein loci is not obvious. In this study, we compared DNA fingerprinting (DFP) to reveal the genetic structure of the quail lines including random bred (RR) control line. Results are as follows. 1) DFP of individual quail showed characteristic pattern and individuals could be distinguishable from each other even within a line, 2) no commonly shared DFP band was observed among 18 quails examined, 3) each line had peculiar DFP pattern, from which we could construct a dendrogram classifiable into three groups consistent with each line, 4) the proportions of commonly shared bands between individuals (BS value) were 0.62 for LL line, 0.79 for SS and 0.43 for RR, while the value between lines was 0.37, which was one half that of within lines, and 5) inbreeding coefficients estimated from BS values were 0.44 for LL, 0.69 for SS and 0.37 for RR and corresponding values estimated from the formula F=Δ1/2 Ne were 0.73, 0, 72 and 0.52, respectively.

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