[Popgenlunch] Fwd: Seminar by Bernardo Carvalho, Mon July 14th noon

Joe Felsenstein joe at gs.washington.edu
Sat Jul 12 11:26:51 PDT 2014

Folks --

Bernardo will be around Monday through Thursday. Here is a talk he is
giving to the Fly Group. (I can't attend it, as I have to be teaching in
SISG at that time).


---------- Forwarded message ----------
From: Barbara Wakimoto <wakimoto at uw.edu>
Date: Sat, Jul 12, 2014 at 9:58 AM
Subject: Fwd: Seminar by Bernardo Carvalho, Mon July 14th noon
To: Joe Felsenstein <joe at gs.washington.edu>, Celeste Berg <
caberg at u.washington.edu>, Evan Eichler <eee at gs.washington.edu>

Joe, Celeste, Evan,
I'm not sure if this notice went to GS folks as intended, so just a
reminder about Bernardo's talk on Monday

---------- Forwarded message ----------
From: Barbara Wakimoto <wakimoto at uw.edu>
Date: Thu, Jul 10, 2014 at 1:53 PM
Subject: Seminar by Bernardo Carvalho, Mon July 14th noon
To: Carlene Cross <crossc2 at uw.edu>

Hi Carlene,
Could you kindly send this seminar announcement to GS folks for me?

Seminar Announcement
Bernardo was a GS sabbatical visitor with Joe Felsenstein last year.


July 14th, MONDAY, 11:00 – noon, Kincaid Hall 502

*Origin and evolution of Y-chromosomes: *

*Drosophila** tales*

Dr. Bernardo Carvalho

Departamento de Genética
Universidade Federal do Rio de Janeiro

As other repeat-rich regions of the genomes, Y-chromosomes are poorly known
in most species, even in the sequenced ones. Y-chromosomes are widely
believed to originate only through the degeneration (i.e., massive gene
loss) of X-chromosomes, a pathway best exemplified by mammals, where most
Y-linked genes are shared with the X. We identified the majority of the
genes of the *Drosophila* Y-chromosome, and we found that it does not seem
to have evolved through the degeneration of X-chromosomes: there is no sign
of X-Y homology, and gene gain (instead of gene loss) is the dominant force
that shaped their gene content. Furthermore, in *D. pseudoobscura* the
ancestral Y chromosome became part of an autosome and was replaced by a
construct of unknown origin, which indicates that *Drosophila* Y
chromosomes are labile. We are now studying ~400 species from *Drosophila*
and related genera in order to verify if Y chromosome replacement (as
occurred in the *D. pseudoobscura* lineage) is a common phenomenon. We are
also applying a recently developed method of identification of Y-linked
genes, aiming to understand the origin of the *Drosophila* Y-chromosome.

For more info, contact Barbara Wakimoto (wakimoto at uw.edu), 543-0487

Joe Felsenstein joe at gs.washington.edu
Department of Genome Sciences and Department of Biology,
University of Washington, Box 355065, Seattle, WA 98195-5065 USA
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