Evolution of insect development: to the hemimetabolous paradigm

• Published in: Current opinion in genetics & development Vol. 20; no. 4; pp. 355 - 361
• Main Authors: Mito, Taro, Nakamura, Taro, Noji, Sumihare
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01-08-2010
• Subjects: Animals; beta Catenin - genetics; beta Catenin - metabolism; beta Catenin - physiology; Biological Evolution; Body Patterning - genetics; Cell migration; Drosophila melanogaster; Gene Expression Regulation, Developmental; Homeodomain Proteins - genetics; Homeodomain Proteins - physiology; Insect Proteins - genetics; Insect Proteins - physiology; Insecta - cytology; Insecta - embryology; Insecta - genetics; Medical Education; Metamorphosis, Biological - genetics; Signal Transduction; Wnt Proteins - genetics; Wnt Proteins - metabolism; Wnt Proteins - physiology
• ISSN: 0959-437X; 1879-0380
• DOI: 10.1016/j.gde.2010.04.005

Mechanisms of insect development have been extensively studied in Drosophila melanogaster , a holometabolous insect. However, recent studies on other insects have gradually revealed that there exist new developmental paradigms. In this review, we focus on the new hemimetabolous paradigm. We highlight how hemimetabolous short-germ or intermediate-germ embryos establish the anterior/posterior (A/P) pattern and the importance of dynamic cell movement during germband formation. In hemimetabolous insects, orthodenticle , encoding a homeodomain-containing transcription factor, and wingless/Wnt signaling could play crucial roles in the A/P pattern formation. We also discuss recent evidence suggesting that insect developmental modes may have evolved by heterochronic shifts, while retaining certain universal metazoan features.