Journal of Experimental Zoology Part B: Molecular and Developmental Evolution

Cover image for Vol. 328 Issue 8

Edited By: Günter P. Wagner

Impact Factor: 2.387

ISI Journal Citation Reports © Ranking: 2016: 17/163 (Zoology); 20/41 (Developmental Biology); 30/48 (Evolutionary Biology)

Online ISSN: 1552-5015

Associated Title(s): Journal of Experimental Zoology Part A: Ecological and Integrative Physiology

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Gunter Wagner - 2017 Kowalevsky Medal Winner

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Recently Published Articles

  1. Identification and characterization of homeobox (Hox) genes and conservation of the single Hox cluster (324.6 kb) in the water flea Daphnia magna

    Duck-Hyun Kim, Bo-Young Lee, Hui-Su Kim, Chang-Bum Jeong, Dae-Sik Hwang, Il-Chan Kim and Jae-Seong Lee

    Version of Record online: 14 FEB 2018 | DOI: 10.1002/jez.b.22793

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    GRAPHICAL ABSTRACT

    • The structural arrays and transcribed orientations of Dm-Hox genes (324.6 kb) were identical to those of Daphnia pulex (∼340 kb).
    • One LINE/R2-NeSL was found between Ubx and Abd-A.
    • Biothorax complex genes (Ubx, Abd-A, and Abd-B) and some antennapedia complex genes (Lab, Scr, Antp) were moderately expressed.
    • The Hox3 gene was barely expressed, while three homeobox genes (Antp, Ubx, Abd-A) were highly expressed at 6–7 days after release from the brood chamber and/or in the adult stage.
    • The structural arrays and transcribed orientations of Dm- and Dp-Hox3, -deformed (dfd), and -fushi tarazu (ftz) genes varied from orthologous genes in pancrustacean species.
  2. Characterization of a satellite DNA in the genera Lacerta and Timon (Reptilia, Lacertidae) and its role in the differentiation of the W chromosome

    Massimo Giovannotti, Paola Nisi Cerioni, Verónica Rojo, Ettore Olmo, Tahar Slimani, Andrea Splendiani and Vincenzo Caputo Barucchi

    Version of Record online: 9 FEB 2018 | DOI: 10.1002/jez.b.22790

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    GRAPHICAL ABSTRACT

    In this study, IMO-TaqI satDNA, previously isolated in several species of Lacertidae, was isolated and characterized from four species of the genus Lacerta and three of the genus Timon. The results here obtained highlighted the presence of this repetitive element in the genome of all the species investigated, thus indicating that IMO-TaqI satDNA is evolutionary conserved among a wide variety of lacertids. In addition, this element was found to be very abundant in the constitutive heterochromatin of the W-sex chromosome of the four Lacerta species investigated. The occurrence of IMO-TaqI satDNA on Lacerta heterochromosome suggests that it is involved in the differentiation of the W chromosome by heterochromatinisation. FISH with IMO-TaqI probe onto metaphases from females of: Timon lepidus (A), Lacerta agilis (B), L. trilineata (C), L. strigata (D). A species-specific probe was used for each species. The arrow indicates the W chromosome. Scale bar =10 μm.

  3. Lose it or keep it: (how bivalves can provide) insights into mitochondrial inheritance mechanisms

    Elisabetta Punzi, Liliana Milani, Fabrizio Ghiselli and Marco Passamonti

    Version of Record online: 2 FEB 2018 | DOI: 10.1002/jez.b.22788

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    GRAPHICAL ABSTRACT

    Studying transcriptomes in two clam species differing for their mitochondrial inheritance mechanism, we identified some candidate E3 ubiquitin ligases and proposed two alternative models describing their involvement in mitochondrial transmission.

  4. RNase reverses segment sequence in the anterior of a beetle egg (Callosobruchus maculatus, Coleoptera)

    Jitse M. van der Meer

    Version of Record online: 2 FEB 2018 | DOI: 10.1002/jez.b.22789

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    GRAPHICAL ABSTRACT

    Insect embryos come in short and long germ types. In short germ types such as Tribolium (Coleoptera), the extra-embryonic membrane is specified anterior to the embryo. In long germ types such as Callosobruchus (Coleoptera) and Drosophila (Diptera), the embryo surrounded by the extra-embryonic membrane occupies the entire length of the egg. Thus, the long germ type occurs in different insect orders suggesting it may have evolved independently several times. This paper is a first step toward testing that hypothesis. RNase introduced early in the anterior cytoplasm of Callosobruchus eggs produces double abdomens in 30% of treated eggs. Early treatment ensures that the likely target is maternal RNA because no nuclei have arrived in the anterior nor are there zygotic transcripts elsewhere in the egg. This confirms findings in Drosophila (Diptera), Tribolium (Coleoptera), and Nasonia (Hymenoptera) in which the sources of the protein gradients that specify the A-P segment pattern (maternal mRNAs) are located in the cytoplasm in the two ends of the egg. The results provide a basis for an analysis of the genetic regulation of segment pattern formation in Callosobruchus. They also set the stage for an exploration of the evolution of short and long germ embryo types within the Coleoptera. A timetable for embryonic development and a fast method for mass collection of eggs are provided.

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