EvC Forum: Rat

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DC85
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From: Richmond, Virginia USA
Registered: 05-06-2003
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Thread Info

Originated: 11-11-2004 8:31 PM
Total Participants: 5
Total Posts: 8

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Topic: Rat

DC85

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Posts: 796

From: Richmond, Virginia USA

Registered: 05-06-2003

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Message 1 of 8 (484585)
11-11-2004 8:31 PM

I am sorry this is a short topic.

I seem to remember a topic on a new species of rat.... Can someone please direct me to that topic?

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Replies to this message:
	Message 2 by AdminAsgara, posted 11-11-2004 8:37 PM
	Message 5 by Morte, posted 11-12-2004 12:26 AM

AdminAsgara

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Message 2 of 8 (484586)
11-11-2004 8:37 PM

Reply to: Message 1 by DC85
11-11-2004 8:31 PM

If you're talking about the tetraploidy rat, there has been some discussion here

This message has been edited by AdminAsgara, 11-11-2004 08:38 PM

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This message is a reply to:
	Message 1 by DC85, posted 11-11-2004 8:31 PM		DC85 has not yet responded

DC85

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Message 3 of 8 (484587)
11-11-2004 9:28 PM

That is it... thank you... but I thought there was a source in that topic... Anyone have one?

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Replies to this message:
	Message 6 by Asgara, posted 11-12-2004 12:34 AM
	Message 7 by pink sasquatch, posted 11-12-2004 4:25 PM

AdminAsgara

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Message 4 of 8 (484588)
11-11-2004 9:32 PM

Thread moved here from the Proposed New Topics forum.

Morte

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Posts: 140

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Message 5 of 8 (484589)
11-12-2004 12:26 AM

Reply to: Message 1 by DC85
11-11-2004 8:31 PM

Message 3

Not sure if this will help now, but here's another post by Lam about it - it doesn't have a link to any info about the rats, but it does say that the species was only recently discovered and there isn't much information on it.

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Asgara

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Message 6 of 8 (484590)
11-12-2004 12:34 AM

Reply to: Message 3 by DC85
11-11-2004 9:28 PM

Just a quick google search brought up 750 hits. I don't know the quality of any of them....

Tetraploidy Rat

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pink sasquatch

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Message 7 of 8 (484591)
11-12-2004 4:25 PM

Reply to: Message 3 by DC85
11-11-2004 9:28 PM

here's the original article

Access via pubmed here, you need journal access for full text.

Nature. 1999 Sep 23;401(6751):341.

Discovery of tetraploidy in a mammal.

Gallardo MH, Bickham JW, Honeycutt RL, Ojeda RA, Kohler N.

Instituto de Ecologia y Evolucion, Universidad Austral de Chile, Valdivia. mgallard@uach.cl

"Nevertheless, genetic evidence indicates that the red viscacha rat, Tympanoctomys barrerae (Octodontidae), is tetraploid. T. barrerae, which is a highly specialized desert rodent, has the largest chromosome complement in mammals with a single XY sex-chromosome system (Fig. 1). Although little is known about meiotic chromosome pairing in T. barrerae, the constant diploid number found in 13 specimens examined at three localities in Argentina indicates that segregation occurs normally."

PMID: 10517628

If you can access the article they have a great comparative figure showing that the tetraploid rat has enormous sperm to accommodate the extra DNA.