Matt Gethers: Difference between revisions

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I'm currently a sophomore in course 20. When I'm behaving myself, I'm allowed to work in the [[Endy Lab]] at [http://mit.edu MIT]. I will be documenting my UROP projects [[Endy:Translation demand | here]]. I will put my 20.109 work directly below.
I'm currently a sophomore in course 20. When I'm behaving myself, I'm allowed to work in the [[Endy Lab]] at [http://mit.edu MIT]. I have links to my UROP projects and 20.109 work directly below.


==20.109 Work==


*[[User:Mgethers/M13 Engineering Ideas|M13 Engineering Ideas]]
==UROP Projects==


{| {{table}}
[[/20.380 HIV Project|20.380 HIV Project]]
| align="center" style="background:#f0f0f0;"|''''''
| align="center" style="background:#f0f0f0;"|'''2.27.07 Ligation and Transformation Data'''
| align="center" style="background:#f0f0f0;"|''''''
|-
| align="center" style="background:#f0f0f0;"|'''DNA Ligation Sample'''
| align="center" style="background:#f0f0f0;"|'''Expected Number of Transformants'''
| align="center" style="background:#f0f0f0;"|'''Observed Number of Transformants'''
|-
| Control Plasmid||Many||1184
|-
| BKB with cocktail but no ligase||0||0
|-
| BKB with ligase and cocktail||0||6
|-
| BKB with insert and ligase and cocktail #1||A few||0-1
|-
| BKB with insert and ligase and cocktail #2||A few||5
|-}


[[/Articles of General Interest| Articles of General Interest]]


*[[User:Mgethers/2.27.06 Ligation and Transformation Data|2.27.06 Ligation and Transformation Data]]
[[/Articles to Read|Articles to Read]]
===2.27.06 Ligation and Transformation Data===


We didn't determine the concentration of the prepped DNA from the ligation reactions, so we cannot calculate the transformation efficiency of these transformations. We do know, however, that 5 ng of vector was used to transform the control plasmid, so efficiency = (1184 colonies)/(5*10^-3 micrograms of DNA)= 5.92*10^6 colonies/microgram of DNA.
[[Endy:Translation demand | Translation Demand]]


The control plasmid transformation serves as a positive control. It should work. If this transformation didn't work (along with some or all of the others), we might suspect an issue with the competency of the cells or with the transformation process. The appearance of colonies on this plate, however, demonstrates that this is not the case. The cells are indeed competent and our protocol worked.  
[http://bcanton.private.openwetware.org/wiki/Lab_Notebook/Matt/Mitochondria_Project Mitochondrial Engineering]


The backbone with and without ligase mixed with the killcut cocktail serve as negative controls. They should not work. If a significant number of colonies were to show up on these plates, this would first mean that the restriction endonucleases weren't cutting. This could be because they had expired or because the sites no longer existed in the DNA. Assuming the latter for the ligated vector, this would mean that the vector sequence was somehow modified during the initial digest. For the linearized vector, the appearance of colonies would suggest that the DNA somehow became ligated and lost restriction sites, or the cell accepted cut vector.
[[/CRI, Thailand| CRI Thailand]]


The controls do not provide a definitive diagnosis of the problem should the experimental ligations fail, but they provide starting points for the inquiry into the failure.
[[/Matt's Stanford Freezer Stocks|Matt's Stanford Freezer Stocks]]


*[[User:Mgethers/2.27.09 Refactoring Work|2.27.09 Refactoring Work]]
[[/OWW Syntax| OWW Syntax]]


===2.27.09 Refactoring Work===
[[/Eloranta Ideas|Eloranta Ideas]]
My refactoring work generally followed the guidelines set out by Chan et al's "Refactoring T7". I started by designing [[http://parts.mit.edu/registry/index.php/Part:BBa_M31530| BBa_M31530]] directly from the germane promoters, RBSs, and ORFs. As an exercise in abstraction, I then started defining more complex functional units. First I defined a gene with its transcriptional and translational regulatory regions as a part. In this way, I don't have to think about how the gene is expressed so much as the end result. An example is [[http://parts.mit.edu/r/parts/partsdb/part_info.cgi?part_name=BBa_M31532| Gene X (BBa_M31532)]]. By the same token, I was able to create functional units of several genes related by their functions. For example, I created [[http://parts.mit.edu/r/parts/partsdb/part_info.cgi?part_name=BBa_M31538| BBa_M31538]] which is made of all the genes responsible for gene amplification of M13K07 while in a host and I made [[http://parts.mit.edu/r/parts/partsdb/part_info.cgi?part_name=BBa_M31540| BBa_M31540]] for phage coat proteins. Within each of these, I attempted to address the possibility of intergenetic cross-talk by introducing transcriptional terminators between the genes [[http://parts.mit.edu/registry/index.php/Part:BBa_B0015| BBa_0015]]. From my work with Heather Keller, I also know that hair pins (5' and 3' UTRs) can play a role in stabilization of DNA and posit that they may be helpful in preventing recombination events. I was unable to locate hairpins as parts in the registry, but I would like to add and make use of them in my refactored M13K07.


Here are a few tables of my work.  
==20.109 Work==


{| {{table}}
*[[User:Mgethers/M13 Engineering Ideas|M13 Engineering Ideas]]
| align="center" style="background:#f0f0f0;"|'''Gene'''
| align="center" style="background:#f0f0f0;"|'''Modification'''
|-
| X||Extract from gene II.
|-
| VII||Separate from gene IX.
|-
| VIII||Separate from gene IX.
|-}


{| {{table}}
*[[User:Mgethers/2.27.06 Ligation and Transformation Data|2.27.06 Ligation and Transformation Data]]
| align="center" style="background:#f0f0f0;"|'''Abstraction (Functional Unit)'''
 
| align="center" style="background:#f0f0f0;"|'''Components of Functional Unit'''
*[[User:Mgethers/2.27.09 Refactoring Work|2.27.09 Refactoring Work]]
|-
| The Regulatory/Coding Region||Strings of DNA
|-
| The Gene||The Promoter, RBS, and ORF
|-
| A Portion of the Life Cycle||The genes responsible for a certain part of the life cycle
|-}


===4.3.07 Primer Designs===
*[[:Image:4.3.07_Primer_Design_Team_Purple.doc|4.3.07_Primer_Design_Team_Purple.doc]]
*[[:Image:4.3.07_Primer_Design_Team_Purple.doc|4.3.07_Primer_Design_Team_Purple.doc]]


*[[User:Mgethers/Research Proposal|Research Proposal]]
*[[User:Mgethers/Research Proposal|Research Proposal]]
==Class projects==
[[/20.310 Term Paper| 20.310 Term Paper]]
==20.310 Project==
<biblio>
#Galkin pmid=17449671
#Carragher pmid=3351926
#Carragher2 pmid=3351927
#Carragher3 pmid=3351930
#Turner pmid=12638863
#Wang pmid=11812133
</biblio>
Treatments exist for preventive and palliative treatment of sickle cell episodes, but no treatment has yet been developed to mitigate the effects of an attack once it has started. We need a way of dealing with Hbs fibers once they have polymerized. We feel we can develop a treatment for an ongoing attack by addressing the biomechanical basis of the pathology.

Latest revision as of 05:22, 18 February 2009

I'm currently a sophomore in course 20. When I'm behaving myself, I'm allowed to work in the Endy Lab at MIT. I have links to my UROP projects and 20.109 work directly below.


UROP Projects

20.380 HIV Project

Articles of General Interest

Articles to Read

Translation Demand

Mitochondrial Engineering

CRI Thailand

Matt's Stanford Freezer Stocks

OWW Syntax

Eloranta Ideas

20.109 Work

Class projects

20.310 Term Paper

20.310 Project

  1. Galkin O, Pan W, Filobelo L, Hirsch RE, Nagel RL, and Vekilov PG. Two-step mechanism of homogeneous nucleation of sickle cell hemoglobin polymers. Biophys J. 2007 Aug 1;93(3):902-13. DOI:10.1529/biophysj.106.103705 | PubMed ID:17449671 | HubMed [Galkin]
  2. Carragher B, Bluemke DA, Gabriel B, Potel MJ, and Josephs R. Structural analysis of polymers of sickle cell hemoglobin. I. Sickle hemoglobin fibers. J Mol Biol. 1988 Jan 20;199(2):315-31. DOI:10.1016/0022-2836(88)90316-6 | PubMed ID:3351926 | HubMed [Carragher]
  3. Bluemke DA, Carragher B, Potel MJ, and Josephs R. Structural analysis of polymers of sickle cell hemoglobin. II. Sickle hemoglobin macrofibers. J Mol Biol. 1988 Jan 20;199(2):333-48. DOI:10.1016/0022-2836(88)90317-8 | PubMed ID:3351927 | HubMed [Carragher2]
  4. Carragher B, Bluemke DA, Becker M, McDade WA, Potel MJ, and Josephs R. Structural analysis of polymers of sickle cell hemoglobin. III. Fibers within fascicles. J Mol Biol. 1988 Jan 20;199(2):383-8. DOI:10.1016/0022-2836(88)90322-1 | PubMed ID:3351930 | HubMed [Carragher3]
  5. Jones CW, Wang JC, Ferrone FA, Briehl RW, and Turner MS. Interactions between sickle hemoglobin fibers. Faraday Discuss. 2003;123:221-36; discussion 303-22, 419-21. DOI:10.1039/b207388a | PubMed ID:12638863 | HubMed [Turner]
  6. Wang JC, Turner MS, Agarwal G, Kwong S, Josephs R, Ferrone FA, and Briehl RW. Micromechanics of isolated sickle cell hemoglobin fibers: bending moduli and persistence lengths. J Mol Biol. 2002 Jan 25;315(4):601-12. DOI:10.1006/jmbi.2001.5130 | PubMed ID:11812133 | HubMed [Wang]

All Medline abstracts: PubMed | HubMed

Treatments exist for preventive and palliative treatment of sickle cell episodes, but no treatment has yet been developed to mitigate the effects of an attack once it has started. We need a way of dealing with Hbs fibers once they have polymerized. We feel we can develop a treatment for an ongoing attack by addressing the biomechanical basis of the pathology.

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