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. Author manuscript; available in PMC: 2015 Apr 2.
Published in final edited form as: Cell Rep. 2012 Feb 16;1(2):118–132. doi: 10.1016/j.celrep.2011.12.010

Figure 1. Origin and evolution of young brain genes in Drosophila.

Figure 1

(A) Origination and age distribution of young brain genes and young nonbrain genes in Drosophila. The phylogenetic tree of representative species is shown in brown solid lines, and split times are labeled above each node. Pie charts above respective evolutionary branches show numbers of young brain genes and young nonbrain genes that originated on each branch. A non-constant rate of brain gene origination was observed.

(B) Distribution of young brain genes and young nonbrain genes according to their origination mechanisms: de novo, RNA-based retroposition and DNA-based duplication.

(C) Chromosomal distribution of young brain genes and young nonbrain genes on major chromosomal arms. Observed and expected values are shown.

(See also: Figure S1)

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