Blunt-end Ligation
Blunt-end Ligation - Related Videos
07:34
DNA Ligation Reactions
0 Views •
2023
In molecular biology, ligation refers to the joining of two DNA fragments through the formation of a phosphodiester bond. An enzyme known as a ligase catalyzes the ligation reaction. In the cell, ligases repair single and double strand breaks that occur during DNA replication. In the laboratory, DNA ligase is used during molecular cloning to join DNA fragments of inserts with vectors – carrier DNA molecules that will replicate target fragments in host organisms. This video provides an...
05:47
Modified Technique for Coronary Artery Ligation in Mice
0 Views •
Cited by 8 •
2013
The surgical procedure used to induce experimental myocardial infarction in mice begins with left thoracotomy between the third and the fourth ribs in order to visualize the anterior surface of the heart and left lung. The left coronary artery is ligated, the chest is closed and the mouse is allowed to recover spontaneously.
11:53
Cecal Ligation Puncture Procedure
0 Views •
Cited by 200 •
2011
The mouse model of cecal ligation and puncture as a valuable tool for the study of human sepsis.
03:06
Combination of High Ligation and Intraoperative Embolization Using Polidocanol for Treatment of Varicoceles
0 Views •
2023
To reduce the postoperative recurrence rate of varicocelectomy, we combined high ligation of varicocele with intraoperative embolization. We injected polidocanol from the spermatic vein during surgery to embolize the branches of the spermatic vein and collateral veins. This is an alternative surgical method for the treatment of varicocele.
08:23
LAD-Ligation: A Murine Model of Myocardial Infarction
0 Views •
Cited by 81 •
2009
This video demonstrates how to use a fast and reliable model to study pathobiological and pathophysiological processes of myocardial ischemia.
FAQs
DNA ligase catalyzes joining by creating a phosphodiester bond between a 5′ phosphate and a neighboring 3′ hydroxyl. The reaction therefore depends on these groups presenting in proper adjacency, rather than on complementary base pairing. This chemistry explains why blunt-end ligation can connect fragments that lack matching overhangs.
Blunt-end ligation generally proceeds less efficiently than sticky-end ligation because flush ends do not gain the stabilizing benefit of complementary overhang pairing. Reaction conditions therefore need optimization when efficient joining is important. This distinction affects experimental planning: the method offers sequence flexibility, but joining may be more demanding than with compatible cohesive ends.
Because either blunt end can join without sequence compatibility, the approach provides less control over how a fragment is oriented than sticky-end ligation. Assemblies may therefore be flexible in connection but less directionally defined. This matters when construct design depends on a predetermined orientation rather than simply linking available DNA pieces.
Prepare DNA fragments with flush ends and ensure the joining substrates present a 5′ phosphate and adjacent 3′ hydroxyl for ligase action. Because these ends ligate comparatively inefficiently, use reaction conditions optimized for blunt-end joining. These considerations focus the workflow on end chemistry and reaction performance rather than sequence compatibility.
The technique supports cloning and broader DNA assembly, particularly when compatible cohesive ends are unavailable. It can also attach adapters and contribute to sequencing-library construction. Its value across these workflows comes from allowing fragments with nonmatching end sequences to be joined, expanding assembly options when sticky-end compatibility would otherwise limit the design.
It is especially useful when researchers need to join DNA fragments but do not have compatible cohesive ends available. Sticky-end ligation generally provides greater efficiency and orientation control, whereas the blunt-end approach prioritizes flexibility. The choice therefore depends on whether the experiment values compatibility-free joining or more efficient, directionally controlled assembly.