Hybridisation's temperature empirically?

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Discussion Overview

The discussion revolves around determining the hybridization temperature empirically, particularly in the context of DNA hybridization. Participants explore methods, comparisons to PCR annealing temperatures, and resources for calculation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant asks how to determine hybridization temperature empirically and seeks resources or tricks for this purpose.
  • Another participant suggests that the inquiry may relate to DNA melting temperature and provides a link to a calculator for estimates.
  • Questions arise about the specific type of hybridization being discussed, with one participant clarifying it involves two DNA molecules looking for homology.
  • There is a discussion about using trial and error to adjust hybridization temperatures based on stringency and signal levels, with a recommendation to start about 30°C below the melting temperature (Tm).
  • Participants express uncertainty about whether hybridization temperature is the same as annealing temperature in PCR, with one participant noting they were initially confused about the context of in situ hybridization versus PCR.
  • Links to additional resources are shared, but there is no consensus on the existence of a specific calculator for hybridization temperature.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the exact methods for determining hybridization temperature or whether it is equivalent to PCR annealing temperature. Multiple viewpoints and uncertainties remain regarding the application and resources available.

Contextual Notes

Participants mention trial and error as a method for determining hybridization temperature, but there are unresolved questions about specific calculation methods and the applicability of provided resources.

indoubt
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hi guys!

how can i determine the hybridisation's temperature empirically?
is there a website for doing this or any tricks?

hopes for replies!

thanks a lot!
 
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Do you mean DNA melting temperature? There's a simplified formula you could use for an estimate, but this works better http://scitools.idtdna.com/Analyzer/
 
Last edited by a moderator:
What type of hybridization are you using?
 
When you say empirically, generally that means trial and error. You can use a method to calculate a likely starting point, then use your results to adjust the temperature up or down to adjust your stringency. If you have a lot of background along with signal, increase stringency, if you aren't getting any signal, decrease stringency.

I didn't look at the site Monique provided, but if it calculates the melting temperature, you can try starting off with a hybridization temperature about 30 C below the Tm. Your hot wash temperature will also affect stringency, so you need to adjust both hybridization and hot wash temperatures appropriately (this makes it doubly challenging).
 
iansmith said:
What type of hybridization are you using?


hi Ian!

it is a hybridization between two DNA molecules. we are looking for if they have any homology.
 
Moonbear said:
When you say empirically, generally that means trial and error. You can use a method to calculate a likely starting point, then use your results to adjust the temperature up or down to adjust your stringency. If you have a lot of background along with signal, increase stringency, if you aren't getting any signal, decrease stringency.

I didn't look at the site Monique provided, but if it calculates the melting temperature, you can try starting off with a hybridization temperature about 30 C below the Tm. Your hot wash temperature will also affect stringency, so you need to adjust both hybridization and hot wash temperatures appropriately (this makes it doubly challenging).


hi moonbear!

you said there is "a method to calculate a likely starting point" do you know which method? it would help a lot, i think.


by the way is hybridization's temperature the same as annealling temperature in PCR? it seems like that, since in PCR the primer will anneal (hybridize) to the template molecule.

so does it mean that we don't have any calculate machine for hybridization's temperature?


thanks!
 
indoubt, when I read your post earlier today, I thought you were talking about in situ hybridization (I must have just added those words in my own head as I read). I don't know the answer for your application. It may be the same, but I'm not sure. Does Monique's link include a calculator? I haven't checked it yet.
 
hi moonbear!

it is in situ hybridization and not PCR i was talked about. i mentioned about PCR bacause i just wanted to compare the annealing temp. in PCR and hybridization temp. in in situ hybridization.

hope i don't confuse you!
 
You might want to look at this
http://www.roche-applied-science.com/fst/products.htm?/DIG/dig_hints04b.htm
 
Last edited by a moderator:
  • #10
thanks! :smile:
 

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