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Nano-channel disentangles knotted DNA

Date:
February 20, 2013
Source:
Sissa Medialab
Summary:
DNA, just like hair, has a tendency to become knotted, thus it may be useful to disentangle it. Unfortunately, it is not possible to “actively” choose at random (or better, in one solution) the filaments with the desired features, and this is why scientists adopt “passive” solutions like, for instance, having the DNA pass through nano-pores or nano-channels.

Knotted DNA.
Credit: Image courtesy of Sissa Medialab

DNA, just like hair, has a tendency to become knotted, thus it may be useful to disentangle it. Unfortunately, it is not possible to "actively" choose at random (or better, in one solution) the filaments with the desired features, and this is why scientists adopt "passive" solutions like, for instance, having the DNA pass through nano-pores or nano-channels.

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"Channels and filaments have physical features we may exploit to selectively let a type of molecule pass through" explains Micheletti. "You can have more or less entangled filaments and featuring knots of different types. In our study we have considered a specific DNA filament model and examined its behavior within a nano-channel. We have observed that by varying the channel's width it is possible to drastically change the quantity and complexity of the knots formed by the DNA."

The nano-channels may therefore be a tool with a double function: on one side they are used to understand the "knotting pattern" of a DNA fragment, on the other they may be used to select entangled filaments in the desired manner. The sectors employing DNA, mainly in sequencing, require an increasing number of new techniques to select the DNA filaments according to their characteristics, such as length, shape as well as entanglement.

"Experimental physicists will be, in the first instance, interested is such technique to obtain knot-free DNA," explains Micheletti referring to the usefulness of the methodology (that for now has been studied through simulation). "We should not forget that such method may also help us better understand, for instance, the functioning of topoisomerases, enzymes that have a very important role in cell metabolism." Such enzymes play a key role in an organism: they maintain the DNA stretched out when the cell is not undergoing the cell division process.

"We are used to envisage chromosomes in their typical rod shaped appearance, the one preceding mitosis, that is to say cell reproduction," adds Micheletti. "However, usually the DNA is a sort of indistinct bundle that fills up the cell's nucleus. The topoisomerases maintain the disentangled filaments with the lowest possible rate of knotting, and do so by snipping and reattaching the little pieces of genetic material." Only on the "disentangled" filament all those transcription processes which are fundamental to the survival of an organism can actually function. "The functioning of such enzymes may be better grasped if, before having them perform, we already know to what extent the molecule was entangled in the first place, and our methodology may be useful to this purpose." concludes Micheletti.


Story Source:

The above story is based on materials provided by Sissa Medialab. Note: Materials may be edited for content and length.


Journal Reference:

  1. Cristian Micheletti, Enzo Orlandini. Knotting and metric scaling properties of DNA confined in nano-channels: a Monte Carlo study. Soft Matter, 2012; 8 (42): 10959 DOI: 10.1039/C2SM26401C

Cite This Page:

Sissa Medialab. "Nano-channel disentangles knotted DNA." ScienceDaily. ScienceDaily, 20 February 2013. <www.sciencedaily.com/releases/2013/02/130220084707.htm>.
Sissa Medialab. (2013, February 20). Nano-channel disentangles knotted DNA. ScienceDaily. Retrieved November 22, 2014 from www.sciencedaily.com/releases/2013/02/130220084707.htm
Sissa Medialab. "Nano-channel disentangles knotted DNA." ScienceDaily. www.sciencedaily.com/releases/2013/02/130220084707.htm (accessed November 22, 2014).

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