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content="Jun-19-03: Are there experimental results to corroborate a link between App with Hsp84-1?">
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style='text-align:left'><span style='font-size:68%'><i>Are there experimental
results to corroborate a link </i></span></span></layer><script> + mytop = 0.06 * g_height; myleft = 0.04 * g_width; myheight = 0.06 * g_height; mywidth = 0.87 * g_width; + document.write( '<layer top=' + mytop + ' left=' + myleft + ' height=' + myheight + ' width=' + mywidth + ' >' ); +</script><span
style='text-align:left'><span style='font-size:68%'><i>between App with
Hsp84-1?</i></span></span></layer></div>
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style='text-align:left'><span style='font-family:"Gill Sans";font-size:250%;
color:#E9EB5D'><i>Yes: Heat shock 84-1 induces the expression of App, </i></span></span></layer><script> + mytop = 0.06 * g_height; myleft = 0 * g_width; myheight = 0.06 * g_height; mywidth = 0.84 * g_width; + document.write( '<layer top=' + mytop + ' left=' + myleft + ' height=' + myheight + ' width=' + mywidth + ' >' ); +</script><span
style='text-align:left'><span style='font-family:"Gill Sans";font-size:250%;
color:#E9EB5D'><i>ubiquitin, and pyruvate kinase</i></span></span></layer></div>
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style='text-align:left'><span style='font-family:"Gill Sans";font-size:250%;
color:#E9EB5D'><i>Having ÒconfirmedÓ these known relations, we can </i></span></span></layer><script> + mytop = 0.06 * g_height; myleft = 0 * g_width; myheight = 0.06 * g_height; mywidth = 0.94 * g_width; + document.write( '<layer top=' + mytop + ' left=' + myleft + ' height=' + myheight + ' width=' + mywidth + ' >' ); +</script><span
style='text-align:left'><span style='font-family:"Gill Sans";font-size:250%;
color:#E9EB5D'><i>now add new members to this family: Atp6l, Gnas, </i></span></span></layer><script> + mytop = 0.13 * g_height; myleft = 0 * g_width; myheight = 0.06 * g_height; mywidth = 0.84 * g_width; + document.write( '<layer top=' + mytop + ' left=' + myleft + ' height=' + myheight + ' width=' + mywidth + ' >' ); +</script><span
style='text-align:left'><span style='font-family:"Gill Sans";font-size:250%;
color:#E9EB5D'><i>Ndr4. A thin veneer of functional genomics.</i></span></span></layer></div>
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<div id=NotesObj style='display:none'>
<table style='color:white' border=0 width="100%">
<tr>
<td width=5 nowrap></td>
<td width="100%"></td>
</tr>
<tr>
<td colspan=1></td>
<td align=left colspan=1><font face=Helvetica size=3>Having worked with
WebQTL now for 30 minutes, do we know anything new? The hypothesis that we
have generated (but not validated) is that three transcripts: Atp6l, Gnas,
and Ndr4 are part of a family of genes that are coregulated in normal mouse
forebrain with App and Hsp84-1. We need to add functional and mechanistic
significance to this hypothesis to make it biologically vibrant. But from a
statiistical standpoint it is a strong inference.</font><br>
</td>
</tr>
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<td colspan=1></td>
<td align=left colspan=1><br>
</td>
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<td colspan=1></td>
<td align=left colspan=1><font face=Helvetica size=3>Please donÕt say: But
these are mere correlations. A high correlation in this context has a
biological basis. The real question is are we smart enough to understand the
web (not chain) of causality that produced the correlation. Once we
understand the web of causality, does it have utility? Very often the answer
will be NO. This will often be the case when a high correlation is generated
by linkage disequilibrium of sets of polymorphisms that modulate a set of
mechanistically separated traits. Chromosomal linkage can produce
correlations that are not mechanistic in the conventional sense used by
molecular biologists. For example, clusters<span style="mso-spacerun:
yes"> </span>of hox transcription factor genes tend to be close
physically to keratin gene clusters, and one might expect shared patterns of
variance produced by this linkage in a mapping panel, no matter how large.</font><br>
</td>
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<tr>
<td colspan=1></td>
<td align=left colspan=1><br>
</td>
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<td colspan=1></td>
<td align=left colspan=1><font face=Helvetica size=3>If Affymetrix designed
probe sets with reasonable care, if we did the experiments correctly, if we
sampled animals appropriately, then a correlation of 0.70 or higher between
transcripts in the brain tells you that these two transcripts are
effectively coupled in this set of animals under this set of conditions.
More than 50% the variance in the expression of one transcript can be
predicted from the other. That is a major piece of information that could be
of significant clinical, economic, and predictive value, whatever its
causes. Yes, correlation coefficients are noisy and have large error terms,
but we have larger n of strains coming to the rescue. Expect more than 50
BXD lines soon.</font><br>
</td>
</tr>
<tr>
<td colspan=1></td>
<td align=left colspan=1><br>
</td>
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<tr>
<td colspan=1></td>
<td align=left colspan=1><font face=Helvetica size=3>This is a thin veneer
of functional genomics. It is enough to generate some marvelous hypotheses
in a semi-automated way.</font><br>
</td>
</tr>
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