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Identification and characterization of novel calcium‐binding proteins of Dictyostelium and their spatial expression patterns during development
Author(s) -
Sakamoto Haruyo,
Nishio Keiko,
Tomisako Mariko,
Kuwayama Hidekazu,
Tanaka Yoshimasa,
Suetake Isao,
Tajima Shouji,
Ogihara Satoshi,
Coukell Barrie,
Maeda Mineko
Publication year - 2003
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/j.1440-169x.2003.00718.x
Subject(s) - dictyostelium , biology , gene , northern blot , morphogenesis , complementary dna , in situ hybridization , gene expression , microbiology and biotechnology , genetics
Five putative Ca2(+)-binding proteins, CBP5, 6, 7, 8 and 9, all having EF-hand motifs, were found by searching the Dictyostelium cDNA database (http://www.csm.biol.tsukuba.ac.jp/cDNAproject.html). 45Ca2(+)-overlay experiments revealed that four of these (excluding CBP9) are real Ca2(+)-binding proteins. Northern blot analysis revealed that the genes encoding CBP5, 6, 7 and 8 are all developmentally regulated. In situ hybridization analyses revealed that spatial expression of these genes was regulated in several different ways. CBP1, 2, 3, 5, 6 and 7 are expressed in prespore cells in the slug stage. Transcripts of the genes for CBP1 and 5 are enriched in prestalk subtype PstO cells. In contrast, CBP4 is expressed predominantly in PstO cells. CBP8 is evenly expressed at a very low level throughout the whole slug. Such distinct spatial expression patterns suggest that the CBP might be involved in morphogenesis and might have their own roles either in prespore or in prestalk cell differentiation of Dictyostelium.