tag:blogger.com,1999:blog-6821840758756075048.post8402663229356126415..comments2023-09-25T09:44:38.184-07:00Comments on Evolutionary Novelties: Opsins: An amazing evolutionary convergenceUnknownnoreply@blogger.comBlogger11125tag:blogger.com,1999:blog-6821840758756075048.post-79115879366848888402017-10-08T00:06:19.751-07:002017-10-08T00:06:19.751-07:00You write about bacterial photosynthesis and give ...You write about bacterial photosynthesis and give bacteriorhodopsin as an example, which is wrong, since bacteriorhodopsin is in fact an arcaeal rhodopsin. An example for bacterial rhodopsins is proteorhodopsin.Anonymoushttps://www.blogger.com/profile/05716162241174844946noreply@blogger.comtag:blogger.com,1999:blog-6821840758756075048.post-37400191451938159962009-01-30T14:38:00.000-08:002009-01-30T14:38:00.000-08:00John - You state "the major opsin sub-types", but ...John - You state "the major opsin sub-types", but then you mention only the vertebrate visual opsins. So, I think you are asking about the origins of the vertebrate visual opsins (which are all "ciliary" opsins).<BR/><BR/>You should check the couple of papers in Current Biology that investigated opsins from the agnathan Geotria. There are trees in two papers, one by Pisani and one by Collin, with slightly different results. The suggestion is that the color vision opsins pre-date living vertebrates..<BR/><BR/>ToddTodd Oakleyhttps://www.blogger.com/profile/14309149952900395185noreply@blogger.comtag:blogger.com,1999:blog-6821840758756075048.post-391948322867937462009-01-22T21:14:00.000-08:002009-01-22T21:14:00.000-08:00Don't know much about bacteria opsins, but in fish...Don't know much about bacteria opsins, but in fishes the same 'key site haplotypes' have evolved independently in different lineages. And, if one looks only for the independent evolution of particular amino acids at key sites, there are many more examples of convergence. <BR/><BR/>My original motive for searching the web for opsin was to find a short cut the the answer to the question: When did the major subtypes of opsins evolve? Humans have a short wave-sensitive called SWS1 (or blue opsin) and two long wave-sensitive opsins (LWS and the other happens to be called MWS, or the middle wave-sensitive opsin because a few mutations have shifted its sensitivity), but there are also RH2 and SWS2 opsins in other vertebrates. And, RH1 opsins in rod cells for dim light vision. What other species have them all?<BR/><BR/>John TaylorJohnThttps://www.blogger.com/profile/03614614657704467363noreply@blogger.comtag:blogger.com,1999:blog-6821840758756075048.post-42536227945212964172009-01-16T07:56:00.000-08:002009-01-16T07:56:00.000-08:00can't believe I missed this when I was out sick .....can't believe I missed this when I was out sick ... nice post ... and in the spirit of research blogging ... a few of us at davis have been talking about putting in a grant on studying evolution and convergence of opsins (I of course care mostly about the ones in microbes) ... would you (i.e., Todd) have any interest in being involved?Jonathan Eisenhttps://www.blogger.com/profile/07953790938128734305noreply@blogger.comtag:blogger.com,1999:blog-6821840758756075048.post-66433503184873207492008-12-21T15:10:00.000-08:002008-12-21T15:10:00.000-08:00It is an interesting concept that convergence is a...It is an interesting concept that convergence is a kind of ortogenic factor of evolution. For non-biologists readers, here a good review to learn what adaptive convergence is (go to question 24): <A HREF="http://www.biology-questions-and-answers.com/evolution-theory.html" REL="nofollow">evolution theory</A>.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6821840758756075048.post-59684239026408216772008-12-20T21:29:00.000-08:002008-12-20T21:29:00.000-08:00Yes, do you have more info on that? A new blog po...Yes, do you have more info on that? A new blog post ;-)Bora Zivkovichttps://www.blogger.com/profile/10763808287050592569noreply@blogger.comtag:blogger.com,1999:blog-6821840758756075048.post-32984518674187094662008-12-20T20:42:00.000-08:002008-12-20T20:42:00.000-08:00coturnix - are you referring to VAL-opsin? That's...coturnix - are you referring to VAL-opsin? That's a non-visual non-pineal brain opsin in zebrafish and ciona(?) Terakita stuck it in as a sister group to other vertebrate opsins.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6821840758756075048.post-382235031472557572008-12-20T19:36:00.000-08:002008-12-20T19:36:00.000-08:00I was also quite excited when this paper came out ...I was also quite excited when <A HREF="http://biology.plosjournals.org/perlserv/?request=get-document&doi=10.1371/journal.pbio.0040254" REL="nofollow">this paper</A> came out - it made some things much clearer.Bora Zivkovichttps://www.blogger.com/profile/10763808287050592569noreply@blogger.comtag:blogger.com,1999:blog-6821840758756075048.post-43169877617601068202008-12-20T00:01:00.000-08:002008-12-20T00:01:00.000-08:00I don't know if the deep-brain opsins were ever se...I don't know if the deep-brain opsins were ever sequenced. That was old literature in which probes for opsins were found to bind to various groups of cells, mostly in the hypothalamus, of various species of birds, reptiles, amphibians, fish and lampreys. This was important for (then controversial, now accepted) notion of extra-retinal photoreception (for photoperiodism and circadian entrainment) in non-mammalian vertebrates.Bora Zivkovichttps://www.blogger.com/profile/10763808287050592569noreply@blogger.comtag:blogger.com,1999:blog-6821840758756075048.post-64581555470413387422008-12-19T19:23:00.000-08:002008-12-19T19:23:00.000-08:00coturnix - These are well nested within Type-II op...coturnix - These are well nested within Type-II opsins.<BR/><BR/>Pinopsin is a ciliary opsin. Melanopsin is a rhabdomeric opsin. Off hand, I am not sure what is a "deep-brain" opsin. I think this might just be another name for melanopsin, but I'd have to check that.<BR/><BR/>One can see the major clades of Type II opsins on our Plos-1 paper!<BR/><BR/>http://www.plosone.org/article/info:doi%2F10.1371%2Fjournal.pone.0001054<BR/><BR/>(For some reason, Plos-1 is showing up as TINY in my Firefox browser these days, hmmm)....Todd Oakleyhttps://www.blogger.com/profile/14309149952900395185noreply@blogger.comtag:blogger.com,1999:blog-6821840758756075048.post-62356617950964770502008-12-19T19:07:00.000-08:002008-12-19T19:07:00.000-08:00Where do pinopsin, melanopsin and non-mammalian de...Where do pinopsin, melanopsin and non-mammalian deep-brain opsins fall on the tree?Bora Zivkovichttps://www.blogger.com/profile/10763808287050592569noreply@blogger.com