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Signal Transduction Genes Required for Heterocyst Maturation in Anabaena sp. Strain PCC 7120

Qing Fan,^1, Sigal Lechno-Yossef,¹ Shigeki Ehira,² Takakazu Kaneko,³ Masayuki Ohmori,² Naoki Sato,⁴ Satoshi Tabata,³ and C. Peter Wolk^1,5*

MSU-DOE Plant Research Laboratory,¹ Department of Plant Biology, Michigan State University, East Lansing, Michigan,⁵ Department of Biochemistry and Molecular Biology, Faculty of Science, Saitama University, Saitama 338-8570, Japan,² Kazusa DNA Research Institute, Kisarazu, Chiba, Japan,³ Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Tokyo, Japan⁴

Received 1 November 2005/ Accepted 29 June 2006

How heterocyst differentiation is regulated, once particular cells start to differentiate, remains largely unknown. Using near-saturation transposon mutagenesis and testing of transposon-tagged loci, we identified three presumptive regulatory genes not previously recognized as being required specifically for normal heterocyst maturation. One of these genes has a hitherto unreported mutant phenotype. Two previously identified regulatory genes were further characterized.

Present address: Northwestern University Feinberg School of Medicine, 303 East Chicago Avenue, Chicago, IL 60611-3008.

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