random shear

Maria Cristina Costanzo mcc9 at cornell.edu
Thu Jun 15 10:45:18 EST 1995

Dear Netters,
    We are thinking about constructing a random shear library and have been
experimenting with shearing total genomic DNA.  Young et al. (PNAS 82:2583,
1985) sheared DNA (0.35 mg/ml) to an average of 5 kb with 150 passages
through a 25-gauge needle. We started with DNA at about 0.15 mg/ml and
after 350 passagess through a 25-gauge needle, it was largely unaffected,
with the smallest fragments about 15 kb.  Does anyone have any suggestions
about how to shear DNA efficiently ?  Does the concentration affect
shearing efficiency ? Any suggestions would be appreciated.  You may
contact me directly at mcc9 at cornell.edu, or post here; I will post a
summary of the replies. Thank you!
    Maria Costanzo 

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