Publication Date:
2004-04-24
Description:
The 18S ribosomal DNA molecular phylogeny and lipid composition of over 120 marine diatoms showed that the capability to biosynthesize highly branched isoprenoid (HBI) alkenes is restricted to two specific phylogenetic clusters, which independently evolved in centric and pennate diatoms. The molecular record of C25 HBI chemical fossils in a large suite of well-dated marine sediments and petroleum revealed that the older cluster, composed of rhizosolenid diatoms, evolved 91.5 +/- 1.5 million years ago (Upper Turonian), enabling an accurate dating of the pace of diatom evolution that is unprecedented. The rapid rise of the rhizosolenid diatoms probably resulted from a major reorganization of the nutrient budget in the mid-Cretaceous oceans, triggered by plate tectonics.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Damste, Jaap S Sinninghe -- Muyzer, Gerard -- Abbas, Ben -- Rampen, Sebastiaan W -- Masse, Guillaume -- Allard, W Guy -- Belt, Simon T -- Robert, Jean-Michel -- Rowland, Steven J -- Moldowan, J Michael -- Barbanti, Silvana M -- Fago, Frederick J -- Denisevich, Peter -- Dahl, Jeremy -- Trindade, Luiz A F -- Schouten, Stefan -- New York, N.Y. -- Science. 2004 Apr 23;304(5670):584-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Marine Biogeochemistry and Toxicology, Royal Netherlands Institute for Sea Research, Post Office Box 59, 1790 AB Den Burg, Texel, Netherlands. damste@nioz.nl〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15105500" target="_blank"〉PubMed〈/a〉
Keywords:
Alkenes/*analysis/metabolism
;
*Biological Evolution
;
DNA, Ribosomal/genetics
;
*Diatoms/classification/genetics/metabolism
;
Fossils
;
*Geologic Sediments
;
Lipids/biosynthesis
;
Molecular Sequence Data
;
Petroleum
;
Phylogeny
;
RNA, Ribosomal, 18S/genetics
;
Terpenes/*analysis/metabolism
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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