INVESTIGADORES
SANCHEZ PUERTA Maria virginia
artículos
Título:
The complete mitochondrial genome sequence of the haptophyte Emiliania huxleyi and its relation to heterokonts
Autor/es:
SÁNCHEZ PUERTA, M. V., T.R. BACHVAROFF & C.F. DELWICHE
Revista:
DNA RESEARCH
Editorial:
OXFORD UNIV PRESS
Referencias:
Año: 2004 vol. 11 p. 1 - 10
ISSN:
1340-2838
Resumen:
<!--
/* Font Definitions */
@font-face
{font-family:"Times New Roman";
panose-1:0 2 2 6 3 5 4 5 2 3;
mso-font-alt:"Trebuchet MS";
mso-font-charset:0;
mso-generic-font-family:auto;
mso-font-pitch:variable;
mso-font-signature:50331648 0 0 0 1 0;}
@font-face
{font-family:Arial;
panose-1:0 2 11 6 4 2 2 2 2 2;
mso-font-alt:Arial;
mso-font-charset:0;
mso-generic-font-family:auto;
mso-font-pitch:variable;
mso-font-signature:50331648 0 0 0 1 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{mso-style-parent:"";
margin:0in;
margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:12.0pt;
font-family:"Times New Roman";
mso-ansi-language:ES;
mso-fareast-language:ES;}
table.MsoNormalTable
{mso-style-parent:"";
font-size:10.0pt;
font-family:"Times New Roman";}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;
mso-header-margin:.5in;
mso-footer-margin:.5in;
mso-paper-source:0;}
div.Section1
{page:Section1;}
-->
The
complete nucleotide sequence of the mitochondrial genome of Emiliania
huxleyi (Haptophyta)
was determined. E. huxleyi is the most abundant coccolithophorid, key in many marine ecosystems and
plays a vital role in the global carbon cycle. The mitochondrial genome
contains genes encoding three subunits of the cytochrome c oxidase,
apocytochrome b, seven subunits of the NADH dehydrogenase complex, two ATPase
subunits, two ribosomal RNAs, 25 tRNAs and five ribosomal proteins. One
potentially functional open reading frame was identified, with no counterpart
in any other organism so far studied. The cox1 gene transcript is apparently spliced from two
distant segments in the genome. One of the most interesting features in this
mtDNA is the presence of the dam gene, which codes for a DNA adenine
methyltransferase. This enzyme is common in bacterial genomes, but is not
present in any studied mitochondrial genome. Despite the great age of this
group (ca. 300 Ma), little is known about the evolution of haptophytes or their
relationship to other eukaryotes. This is the first published haptophyte
organellar genome, and will improve the understanding of their biology and
evolution and allow us to test the monophyly of the chromoalveolate clade.
