Tag Archives: NF1A

Agarose Gel – Geoduck & Olympia Oyster gDNA

Needed to assess the integrity of the newest gDNA isolated for the two genome sequencing projects: Geoduck gDNA from earlier today and Olympia oyster gDNA from 20151002.

Also needed to assess the integrity of the gDNA of ethanol-preserved Olympia oyster mantle tissue from Jake’s reciprocal transplant experiment, isolated on 20151002: samples NF1A & SN49A.

Ran samples on a 0.8% agarose, 1X modified TAE gel.

Loaded 1μL (~300ng) of the geoduck, Oly and NF1A samples.

Loaded 2μL (~100ng) of the SN49A sample.

Used 5μL of ladder.

Results:

 

Genome Sequencing Samples

The geoduck and the Oly samples look good. Intact, high molecular weight band. My only concern is the noticeable difference in band intensities between these two. Both samples should be ~300ng/μL, based on the NanoDrop1000 readings. However, it’s evident that the concentrations of these two samples differ greatly. Additionally, we can use the ladder to gauge the concentrations of the samples, since I loaded 0.5μg of the ladder, which is the quantity referenced on the ladder guide above.

It would appear that the geoduck sample concentration is closer to 60ng/μL (band intensity is similar to that of the 500, 1000, & 3000bp markers), as opposed to the 292ng/μL that the NanoDrop1000 indicated.

The Oly sample appears to have even less and appears less intense than the lowest concentration bands on the marker (16.0ng/μL). That’s not even remotely close to the 331ng/μL measured by the NanoDrop1000.

It’s difficult to say why this might be, as both samples were RNased and neither of them show extensive smearing (both of those factors would contribute to inflated spec readings).

Regardless, will ship them off to BGI to supplement the previous gDNA for this project.

Ethanol-Preserved Samples

Both samples show extensive smearing and no high molecular weight band, indicating they are both completely degraded. This is a very bad result for this project, as the tissue in this group is/was a bit of grasping at straws to obtain some intact DNA to use for the RAD-seq that we intend to pursue.

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DNA Isolation – Geoduck & Olympia Oyster

Amazingly, we need more gDNA for the two genome sequencing projects (geoduck and Olympia oyster). Used geoduck “foot 1″ sample from Box 1 of the foot samples collected by Brent & Steven on 20150811. Used Olympia oyster adductor muscle from Box 1 of adductor muscle sample collected by Brent & Steven on 20150812.

Also need to evaluate DNA quality of initial broodstock samples from Jake’s Olympia oyster reciprocal transplant experiment. Used mantle samples stored in EtOH collected by Hannah (see her notebook entries on July 25 & Sept 5, 2013)

Tissue weights:

  • Geoduck foot: 108.5mg (gone)
  • Olympia oyster adductor: 258.7mg (gone)
  • Oly NF1A: 7.1mg (gone)
  • Oly SN49A: 20.8mg

 

Samples were isolated using DNAzol (Molecular Research Center) according to the manufacturer’s protocol, with the following adjustments:

 

  • Tissues homogenized in 750μL of DNAzol with disposable mortar/pestle tubes using 10 pestle strokes
  • After homogenization, topped off tubes to 960μL with DNAzol, added 40μL RNAse A (100mg/mL) and incubated @ RT for 15mins.
  • Performed optional centrifugation step (10,000g, 10mins @ RT)
  • Initial pellet wash was performed using a 70%/30% DNAzol/EtOH
  • Pellets were resuspended Buffer EB (Qiagen)
  • Insoluble material was pelleted (12,000g, 10mins @ RT) and supe transferred to new tubes

 

Genome sequencing resuspension volumes: 50μL

Oly reciprocoal resuspension volumes: 25μL

Spec’d on Roberts Lab NanoDrop1000.

Results:

 

Genome Sequencing Samples

The 260/280 ratios look fine. The 260/230 ratios look poor, as is usually the case after DNAzol isolations.

Yields:

Geoduck: 7.6μg

Oly: 16.5μg

The geoduck yield is insufficient to make up the quantity of gDNA still needed by BGI for sequencing. Will have to isolate more gDNA on Monday.

 

Reciprocal Transplant Samples

The 260/280 ratios look fine. The 260/230 ratios look poor, as is usually the case after DNAzol isolations.

Yields:

NF1A: 7,1μg

SN49A: 1.375μg

The yields are surprisingly good! Next up is to evaluate the gDNA quality on a gel to see if the samples from this experiment will be usable.

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