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A Amores, A Force, YL Yan, L Joly, C Amemiya, A Fritz,
RK Ho, J Langeland, V Prince, YL Wang, M Westerfield, M Ekker,
JH Postlethwait (1998),
"Zebrafish hox clusters and vertebrate genome evolution",
Science, 282:1711-1714.
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NM Brooke, J Garcia-Fernandez, PW Holland (1998),
"The ParaHox gene cluster is an evolutionary sister of
the Hox gene cluster",
Nature, 392:920-922.
Comments by Skrabanek and Wolfe (1998) :
Three homeobox genes, Gsx, Xlox (Pdx) and Cdx,
are clustered in the amphioxus genome and may also
be clustered in mammals. These genes are similar to
three of the Hox paralogy groups in terms of their
sequence, expression, and order on the
chromosome. ParaHox and Hox arose by duplication
>520 Mya, before Hox duplicated further to produce
the four clusters found in mammals.
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Wilfried W de Jong, Gert-Jan Caspers, Jack AM Leunissen (1998),
"Genealogy of the alpha-crystallin-small heat-shock protein superfamily",
International Journal of Biological Macromolecules, 22(3-4):151-162.
[ abstract]
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N El-Mabrouk, JH Nadeau, D Sankoff (1998),
"Genome halving", in Combinatorial Pattern Matching ,
Lecture Notes in Computer Science, Vol.1448,
ed. Martin Farach-Colton (Springer). ISBN 3540647392.
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N El-Mabrouk, J Nadeau, D Sankoff (1998),
"Genome halving", In Combinatorial Pattern Matching ,
ed. Martin Farach, Lecture Notes in
Computer Science, Vol. 1448, pp. 235-250.
(Springer). ISBN 3540647392.
[ PDF ]
[ this is a computer science paper ]
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O Eulenstein, B Mirkin, M Vingron (1998),
"Duplication-based measures of difference between
gene and species trees",
Journal of Computational Biology, 5:135-148.
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MD Gale, KM Devos (1998),
"Comparative genetics in the grasses",
Proceedings of National Academy of Sciences, 95:1971-1974.
[html]
Comments by Skrabanek and Wolfe (1998) :
In our opinion, although there is strong evidence
both that the maize genome is an ancient tetraploid
and that there is substantial conservation of gene
order among grasses, the 'Lego' model of Gale and
co-workers is misleading and questionable. The
circular representation of the aligned genomes of
different species (including two putative
sub-genomes from maize) implies that either there
have been no chromosomal fusions or translocations
during grass evolution - in which case the ancestor
of the grasses must have had just a single, giant,
chromosome; - or else that chromosomal
fusions occur but each chromosome is only
permitted to fuse with a particular designated
partner. Neither of these seems plausible.
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TJ Gibson, J Spring (1998),
"Genetic redundancy in vertebrates: polyploidy and
persistence of genes encoding multidomain proteins",
Trends in Genetics, 14:46-49.
Comments by Skrabanek and Wolfe (1998) :
Point mutations in developmental genes often have
dominant deleterious phenotypes, whereas complete
deletion of these genes often has no phenotype.
Gibson and Spring argue that this is to be expected
for genes encoding multidomain proteins and that
this may prevent these genes from decaying into
pseudogenes.
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Peter WH Holland (1998),
"Major transitions in animal evolution: a developmental genetic perspective",
American Zoologist, 38(6):829-842.
[abstract]
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AL Hughes (1998),
"Phylogenetic tests of the hypothesis of block duplication
of homologous genes on human chromosomes 6, 9, and 1",
Molecular Biology and Evolution, 15:854-870.
Comments by Skrabanek and Wolfe (1998) :
The combined results from this study and that of
Endo et al. show that, of the 11 gene pairs on
HSA6/HSA9 that have previously been proposed, a
simultaneous origin seems possible for six:
RXRA/RXRB, COL5A1/COL11A2, ORFX/RING3,
PBX3/PBX2, C5/C4A and TNC/TNX. Gene order for
these pairs is conserved except for one inversion of
C5 and TNC. Other gene pairs are either much older
(ABC2/TAP1, NOTCH1/INT3, PSMB7/PSMB8 and
HSPA5/HSPA1A) or much younger
(VARS1/VARS2). Despite their similar conclusions,
the use of different molecular clock calibrations in
the two studies causes them to disagree on the
absolute date of the block duplication: 579-696 Mya
in Hughes' study, but 161-580 Mya in Endo et al.'s.
The latter group also put forward a convoluted
hypothesis involving two rounds of duplication to
explain the presence of older gene pairs in the
region, whereas Hughes proposes that there may be
some sort of selective constraint causing clustering
of the ancient paralogues.
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MA Huynen, E van Nimwegen (1998),
"The frequency distribution of gene family sizes in complete genomes",
Molecular Biology and Evolution, 15:583-589.
abstract:
We compare the frequency distribution of gene family sizes in the complete
genomes of six bacteria (Escherichia coli, Haemophilus influenzae,
Helicobacter pylori, Mycoplasma genitalium, Mycoplasma pneumoniae, and
Synechocystis sp. PCC6803), two Archaea (Methanococcus jannaschii and
Methanobacterium thermoautotrophicum), one eukaryote (Saccharomyces
cerevisiae), the vaccinia virus, and the bacteriophage T4. The sizes of the
gene families versus their frequencies show power- law distributions that
tend to become flatter (have a larger exponent) as the number of genes in
the genome increases. Power-law distributions generally occur as the limit
distribution of a multiplicative stochastic process with a boundary
constraint. We discuss various models that can account for a multiplicative
process determining the sizes of gene families in the genome. In particular,
we argue that, in order to explain the observed distributions, gene families
have to behave in a coherent fashion within the genome; i.e., the
probabilities of duplications of genes within a gene family are not
independent of each other. Likewise, the probabilities of deletions of genes
within a gene family are not independent of each other.
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M Kasahara (1998),
"What do the paralogous regions in the genome tell us about the origin
of the adaptive immune system?",
Immunological Review, 166:159-175. .
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Marc Kirschner, John Gerhart (1998),
"Evolvability",
Proceedings of National Academy of Sciences, 95(15):8420-8427.
[html]
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James R Lupski (1998),
"Genomic disorders: structural features of the genome can lead to
DNA rearrangements and human disease traits",
Trends in Genetics, 14(10):417-422.
[ abstract]
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MA Matzke, AJM Matzke (1998),
"Polyploidy and transposons",
Trends in Ecology & Evolution, 13(6):241.
[ abstract]
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Richard Mazzarella, David Schlessinger (1998),
"Pathological consequences of sequence duplications in the human genome",
Genome Research, 8(10):1007-1021.
[abstract]
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M-J Pébusque, F Coulier, D Birnbaum, P Pontarotti (1998),
"Ancient large scale genome duplications: phylogenetic and
linkage analyses shed light on chordate genome evolution",
Molecular Biology and Evolution, 15:1145-1159.
[abstract]
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JH Postlethwait, YL Yan, MA Gates, S Horne, A Amores,
A Brownlie, A Donovan, ES Egan, A Force, Z Gong, et al. (1998),
"Vertebrate genome evolution and the zebrafish gene map",
Nature Genetics, 18:345-349.
Comments by Skrabanek and Wolfe (1998) : Duplicated genes linked
to the four Hox clusters in mammals - the HSA 2/7/12/17 region - are also
linked to them in zebrafish, and parts of the HSA 1/6/9/19 region are conserved.
This implies that the duplications producing these regions occurred prior
to the bony fish/tetrapod divergence, contrary to Lundin's proposal
(Fig. 1). As noted in the commentary by Aparicio [49], although zebrafish and
mammals show conservation of synteny, gene order is often rearranged in
these examples. Postlethwait et al. also report some examples where a pair of
linked genes in a mammal seems to correspond to two linked pairs in zebrafish
and propose that additional duplications (either of chromosomal fragments
or of the whole genome) may have occurred in this species.
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J Ramsey, DW Schemske (1998),
"Pathways, mechanisms and rates of polyploid formation in flowering plants",
Annual Review of Ecol. Syst. 29:467-501.
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Sylvie Rouquier, Sylvie Taviaux, Barbara J Trask, Véronique Brand-Arpon,
Ger van den Engh, Jacques Demaille, Dominique Giorgi (1998),
"Distribution of olfactory receptor genes in the human genome",
Nature Genetics, 18:243-250.
[ abstract]
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C Seoighe, KH Wolfe (1998),
"Extent of genomic rearrangement after genome duplication
in yeast",
Proceedings of National Academy of Sciences, 95:4447-4452.
[html]
[ PDF ]
abstract:
Whole-genome duplication approximately 108 years
ago was proposed as an explanation for the many duplicated
chromosomal regions in Saccharomyces cerevisiae. Here we
have used computer simulations and analytic methods to estimate some
parameters describing the evolution of the yeast genome after
this duplication event. Computer simulation of a model
in which 8% of the original genes were retained in duplicate
after genome duplication, and 70-100 reciprocal translocations
occurred between chromosomes, produced arrangements of
duplicated chromosomal regions very similar to the map of
real duplications in yeast. An analytical method produced an
independent estimate of 84 map disruptions. These results
imply that many smaller duplicated chromosomal regions exist
in the yeast genome in addition to the 55 originally reported.
We also examined the possibility of determining the original
order of chromosomal blocks in the ancestral unduplicated
genome, but this cannot be done without information from
one or more additional species. If the genome sequence of
one other species (such as Kluyveromyces lactis) were known
it should be possible to identify 150-200 paired regions
covering the whole yeast genome and to reconstruct approximately
two-thirds of the original order of blocks of genes in
yeast. Rates of interchromosome translocation in yeast
and mammals appear similar despite their very different rates
of homologous recombination per kilobase.
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MW Simmen, S Leitgeb, VH Clark, SJ Jones, A Bird (1998),
"Gene number in an invertebrate chordate, Ciona intestinalis",
Proceedings of National Academy of Sciences, 95:4437-4440.
[html]
Comments by Skrabanek and Wolfe (1998) :
A method for estimating the number of genes in any
eukaryote on the basis of BLAST searches with
random genomic and cDNA sequences. The method
was tested using subsets of the data from the
Caenorhabditis elegans genome project, and was
then applied to the tunicate Ciona intestinalis. Its
apparent accuracy, simplicity, and low cost - only 76
EST and 1487 genomic single-pass sequencing runs
were made - make it attractive to apply to other
organisms such as amphioxus and lamprey.
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EA Sistermans, RF de Coo, IJ De Wijs and BA Van Oost (1998),
"Duplication of the proteolipid protein gene is the major cause of
Pelizaeus-Merzbacher disease",
Neurology, 50(6):1749-1754.
[abstract]
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L Skrabanek, KH Wolfe
(1998),
"Eukaryotic genome duplication - where's the evidence? "
Current Opinion in Genetics and Development, 8:694-700.
abstract:
Several eukaryotes, including maize, yeast and
Xenopus, are degenerate polyploids formed by
relatively recent whole-genome duplications.
Ohno's conjecture that more ancient genome
duplications occurred in an ancestor of vertebrates
is probably at least partly true but the present
shortage of gene sequence and map information
from vertebrates makes it difficult to either prove or
disprove this hypothesis. Candidate paralogous
segments in mammalian genomes have been
identified but the lack of statistical rigour means that
many of the proposals in the literature are probably
artefacts.
[ PDF ]
[ html]
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Andreas Wagner (1998),
"The fate of duplicated genes: loss or new function?",
Bioessays, 20(10):785-788.
[ abstract]
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Kunitoshi Yamanaka, Li Fang, Masayori Inouye (1998),
"The CspA family in Escherichia coli:
multiple gene duplication for stress adaptation",
Molecular Microbiology, 27(2):247-255.
[ abstract]
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YP Yuan, O Eulenstein, M Vingron, P Bork (1998)
"Towards detection of orthologues in sequence databases",
Bioinformatics, 14:285-289.
abstract:
MOTIVATION: Numerous homologous sequences from diverse species
can be retrieved from databases using programs such as BLAST.
However, due to multigene families, evolutionary relationship often cannot
be easily determined and proper functional assignment becomes difficult.
Thus, discrimination between orthologues and paralogues within BLAST
output lists of homologous sequences becomes more and more important.
RESULT: We therefore developed a method that attempts to construct a
reconciled tree from a gene tree of selected sequences and its
corresponding phylogenetic tree of the species involved (species tree).
An interface on the Web is developed to enable users to analyse the
BLAST result. BLAST outputs are parsed and, for the selected
sequences, multiple alignments are constructed either globally or for local
regions. Bootstrapped trees are returned and compared with the
expected species tree. In cases of discrepancies, gene duplications are
assumed and a reconciled tree is computed. The reconciled tree shows
probable orthologues and paralogues as predicted.
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Jianzhi Zhang, Helene F. Rosenberg, Masatoshi Nei (1998),
"Positive Darwinian selection after gene duplication in primate ribonuclease genes",
Proceedings of National Academy of Sciences, 95:3708-3713.
[abstract]
[html]
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