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Keywords: Leech
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Journal Articles
Journal Articles
Journal: Development
Development (2004) 131 (23): 5859–5869.
Published: 1 December 2004
... and the dorsolateral P lineage differ to some degree in distantly related clitellate species such as the leeches Helobdella and Theromyzon , and the sludgeworm Tubifex . To examine this developmental variation at a lower taxonomic level, we have explored the specification pathways of the O and P lineages in the leech...
Journal Articles
Journal: Development
Development (2004) 131 (17): 4143–4153.
Published: 1 September 2004
...Daniel H. Shain; Duncan K. Stuart; Françoise Z. Huang; David A. Weisblat The leech nervous system comprises a relatively simple network of longitudinal (connective) and transverse (segmental) nerves. We have followed the normal pattern of axon development in the glossiphoniid leech Theromyzon rude...
Journal Articles
Journal Articles
Journal: Development
Development (2002) 129 (15): 3681–3692.
Published: 1 August 2002
...Mi Hye Song; Françoise Z. Huang; Gwendolen Y. Chang; David A. Weisblat We have identified homologs of the Drosophila pair-rule gene even-skipped in the glossiphoniid leeches Helobdella robusta and Theromyzon trizonare . In leech embryos, segments arise sequentially from five pairs of embryonic...
Journal Articles
Journal: Development
Development (2002) 129 (3): 719–732.
Published: 1 February 2002
...Françoise Z. Huang; Dongmin Kang; Felipe-Andres Ramirez-Weber; Shirley T. Bissen; David A. Weisblat In leech embryos, segmental mesoderm and ectoderm arise from teloblasts by lineages that are already relatively well characterized. Here, we present data concerning the early divisions...
Journal Articles
Journal: Development
Development (2001) 128 (9): 1629–1641.
Published: 1 May 2001
...Elaine C. Seaver; Marty Shankland ABSTRACT The segmented ectoderm and mesoderm of the leech arise via a stereotyped cell lineage from embryonic stem cells called teloblasts. Each teloblast gives rise to a column of primary blast cell daughters, and the blast cells generate descendant clones...
Journal Articles
Journal: Development
Development (2000) 127 (4): 735–744.
Published: 15 February 2000
...Daniel H. Shain; Duncan K. Stuart; Françoise Z. Huang; David A. Weisblat Central nervous system (CNS) in leech comprises segmentally iterated progeny derived from five embryonic lineages (M, N, O, P and Q). Segmentation of the leech CNS is characterized by the formation of a series of transverse...
Journal Articles
Journal: Development
Development (1999) 126 (15): 3381–3390.
Published: 1 August 1999
... precursor cells of the glossiphoniid leech Helobdella robusta . We find that this fusion event is regulated inductively by a cell that does not itself fuse. We also show that biochemical arrest (by microinjection with ricin A chain or ribonuclease A) of the inducer or either of the fusion partners prevents...
Journal Articles
Journal: Development
Development (1997) 124 (9): 1771–1780.
Published: 1 May 1997
...Marc Pilon; David A. Weisblat ABSTRACT From the glossiphoniid leech Helobdella robusta , we have cloned and determined the complete coding sequence of Hro-nos , a gene homologous to the nanos gene from Drosophila melanogaster . Developmental northern blots show that Hro-nos , like nanos...
Journal Articles
Journal: Development
Development (1996) 122 (6): 1839–1847.
Published: 1 June 1996
...Françoise Z. Huang; David A. Weisblat ABSTRACT In embryos of glossiphoniid leeches such as Helobdella triserialis and H. robusta , pairs of adjacent ‘o/p’ ectodermal blast cells are known to be developmentally equipotent and yet eventually contribute distinct sets of ‘O’ and ‘P’ progeny...
Journal Articles
Journal: Development
Development (1996) 122 (6): 1885–1894.
Published: 1 June 1996
...Constance M. Smith; Deborah Lans; David A. Weisblat ABSTRACT Gastrulation in leech embryos is dominated by the epibolic movements of two tissues: germinal bands, composed of segmental precursor cells, and an overlying epithelium that is part of a provisional integument. During gastrulation...
Journal Articles
Journal: Development
Development (1995) 121 (7): 2091–2097.
Published: 1 July 1995
...Felipe-Andrés Ramírez; Cathy J. Wedeen; Duncan K. Stuart; Deborah Lans; David A. Weisblat ABSTRACT In embryos of leeches (phylum Annelida), metameric structures arise sequentially from a germinal plate comprising the descendants of five pairs of embryonic stem cells called teloblasts. It has been...
Journal Articles
Journal Articles
Journal Articles
Journal: Development
Development (1993) 117 (3): 857–871.
Published: 1 March 1993
...Deborah Lans; Cathy J. Wedeen; David A. Weisblat ABSTRACT ht-en is an engrailed -class gene that is expressed during early development and neurogenesis in embryos of the leech Helobdella triserialis . During the early development of this annelid (stages 7-9), ht-en is expressed in each...
Journal Articles
Journal: Development
Development (1992) 116 (2): 427–434.
Published: 1 October 1992
...Tom Becker; Eduardo R. Macagno ABSTRACT Most midbody ganglia in the central nervous system (CNS) of the leech Hirudo medicinalis contain about 400 neurons. However, those in the fifth and sixth midbody segments (ganglia M5 and M6) are specialized for reproductive functions, and each contain several...
Journal Articles
Journal: Development
Development (1991) 113 (3): 805–814.
Published: 1 November 1991
...Cathy J. Wedeen; David A. Weisblat ABSTRACT ht-en protein, an annelid homolog of the Drosophila engrailed protein, is expressed during both early development and neurogenesis in embryos of the leech, Helobdella triserialis . In Helobdella as in Drosophila , early expression is in segmentally...
Journal Articles
Journal: Development
Development (1991) 111 (4): 993–1005.
Published: 1 April 1991
...Steven A. Torrence ABSTRACT The stereotyped distribution of identified neurons and glial cells in the leech nervous system is the product of stereotyped cell migrations and rearrangements during embryogenesis. To examine the dependence of longdistance cell migrations on positional cues provided...
Journal Articles
Journal: Development
Development (1989) 106 (1): 105–118.
Published: 1 May 1989
...Shirley T. Bissen; David A. Weisblat When tritiated thymidine triphosphate ([ 3 H]TTP) or its immunohistochemically detectable analogue, bromodeoxyuridine triphosphate (BrdUTP), is injected into blastomeres of leech embryos it passes throughout the entire embryo and is rapidly incorporated (within...