Highly repetitive DNA sequences provide evidence for a lack of gene flow between morphological forms of Herdmania momus (Ascidiacea: Stolidobranchia).

Degnan, B. M. and Lavin, M. F. (1995) Highly repetitive DNA sequences provide evidence for a lack of gene flow between morphological forms of Herdmania momus (Ascidiacea: Stolidobranchia).. Marine Biology, 124 2: 293-299. doi:10.1007/BF00347133


Author Degnan, B. M.
Lavin, M. F.
Title Highly repetitive DNA sequences provide evidence for a lack of gene flow between morphological forms of Herdmania momus (Ascidiacea: Stolidobranchia).
Journal name Marine Biology   Check publisher's open access policy
ISSN 0025-3162
1432-1793
Publication date 1995-12-01
Year available 2007
Sub-type Article (original research)
DOI 10.1007/BF00347133
Volume 124
Issue 2
Start page 293
End page 299
Total pages 7
Place of publication Berlin
Publisher Springer-Verlag
Language eng
Subject 270205 Genetic Development (incl. Sex Determination)
Abstract The genomic structure of two morphological forms of the pyurid ascidian Herdmania momus — H. momus forma curvata and H. momus forma grandis—are compared using a rapidly evolving highly repetitive element isolated from the genome of H. momus forma curvata. A 663 bp (base pair) Cla I satellite sequence is present only in the genome of H. momus forma curvata, and hence can be used as a form-specific marker. Low-stringency Southern blot analyses, using the Cla I satellite as a probe, revealed that the genomes of H. momus forma grandis and another pyurid ascidian, Pyura stolonifera, do not contain similar sequences to the H. momus forma curvata repetitive element. In addition to this genomic dissimilarity, there are a number of significant reproductive and developmental differences between the two H. momus forms, and interform fertilisation rates are significantly lower than intraform rates. The molecular, reproductive and developmental differences between H. momus forma curvata and H. momus forma grandis indicate the presence of strong barriers to gene flow.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Degnan Laboratory
School of Biological Sciences Publications
 
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Created: Thu, 06 Dec 2007, 00:53:26 EST by Laura McTaggart