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Construction method for PacBio sequencing library

A technology of sequencing library and construction method, applied in the field of library construction of PacBio sequencing, can solve the problems of loss of DNA samples, ineffective application, increased time consumption of sequencing libraries, etc., to improve the utilization rate and avoid the lower and lower circularization efficiency. Effect of total DNA requirement

Active Publication Date: 2021-07-20
INST OF ZOOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the purification and recovery operation not only causes the loss of DNA samples, but also significantly increases the time consumption of sequencing library construction.
These deficiencies prevent the conventional PacBio sequencing library construction method from being effectively applied to occasions where a small amount of DNA is input, such as precious human samples, small animal and plant samples, etc.

Method used

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  • Construction method for PacBio sequencing library
  • Construction method for PacBio sequencing library

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1. Establishment of the PacBio sequencing library construction method based on Tn5 transposase

[0045] 1. Preparation of transposase complexes containing hairpin sequencing adapters ( figure 1 A)

[0046] 1. Design and synthesis of hairpin sequencing linker sequences

[0047] The sequence of the hairpin sequencing adapter is composed of fragment a, fragment b and fragment c sequentially from the 5' end ( figure 2 ), wherein fragment a and fragment c are completely reverse complementary.

[0048] Fragment a includes a transposase recognition sequence, and fragment a is phosphorylated from the first base at the 5' end;

[0049] In fragment a, a DNA barcode sequence for distinguishing different samples can also be introduced, the DNA barcode is located at the 3' end of the transposase recognition sequence; the DNA barcode sequence is composed of more than 2 random bases, and the random bases are Any of ATCG;

[0050] Multiple samples correspond to multiple h...

Embodiment 2

[0070] Example 2, PacBio sequencing library construction based on constant (1 μg) DNA input of Tn5 transposase

[0071] 1. Preparation of the transposase complex PC0 containing the hairpin sequencing adapter ( figure 1 A)

[0072] 1. Design and synthesis of hairpin sequencing linker sequences

[0073] The artificially synthesized hairpin structure sequencing linker sequence PC0 is as follows:

[0074] PC0:

[0075] 5'-pCTGTCTCTTATACACATCT ATCTCTCTC TTTTCCTCCTCCTCCGTTGTTGTTGTT GAGAGAGAT AGATGTGTATAAGAGACAG-3' (SEQ ID NO: 1)

[0076] Among them, the 19 bases in bold at the 5' end ( figure 2 , Fragment a) can form a hairpin structure in a reverse complementary manner with the 19 bases (fragment c) that are thickened at the end of the 3' end; 19 bases at the end of the 5' end (fragment a), and 19 bases at the end of the 3' end The reverse complementary sequence of the base (fragment c) is the Tn5 transposase recognition sequence; the middle 45 base sequence (fragment b) ...

Embodiment 3

[0137] Example 3, PacBio sequencing library construction based on a small amount of (100ng) DNA input from Tn5 transposase

[0138] 1. Preparation of the transposase complex PC0 containing the hairpin sequencing adapter ( figure 1 A)

[0139] 1. Design and synthesis of hairpin sequencing linker sequences

[0140] The artificially synthesized hairpin structure sequencing linker sequence PC0 is as follows:

[0141] PC0:

[0142] 5'-pCTGTCTCTTATACACATCT ATCTCTCTC TTTTCCTCCTCCTCCGTTGTTGTTGTT GAGAGAGAT AGATGTGTATAAGAGACAG-3' (SEQ ID NO: 1)

[0143] Among them, the 19 bases in bold at the 5' end ( figure 2 , Fragment a) can form a hairpin structure in a reverse complementary manner with the 19 bases (fragment c) that are thickened at the end of the 3' end; 19 bases at the end of the 5' end (fragment a), and 19 bases at the end of the 3' end The reverse complementary sequence of the base (fragment c) is the Tn5 transposase recognition sequence; the middle 45 base sequence (...

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Abstract

The invention discloses a construction method for a PacBio sequencing library. The invention provides a construction method for a PacBio sequencing library, which comprises the following steps: inserting a sequencing joint containing a hairpin structure into a target DNA molecule through transposase to realize DNA cyclization so as to obtain a PacBio sequencing library. Experiments prove that according to the PacBio sequencing library construction method disclosed by the invention, a reaction buffer solution is effectively selected, so that the whole reaction is completed in a same reaction tube from transposon insertion fragmentation to library cyclization; and especially in the construction process of the sequencing library with low DNA dosage, DNA sample loss caused by purification and recovery after a conventional fragmentation step is effectively avoided, the utilization rate of the template is improved, the complexity and time consumption of the experiment are reduced, and construction and recovery of the PacBio sequencing library can be completed within 2 hours at the soonest.

Description

technical field [0001] The invention belongs to the field of biotechnology, and relates to a library construction method for PacBio sequencing. Background technique [0002] Third-generation sequencing technologies such as PacBio have promoted the rapid development of genome assembly and structural variation identification. PacBio sequencing requires the use of a circularized DNA library. The existing library construction schemes are based on DNA blunt ends or TA ligation; before library construction, these two ligation methods often require fragmentation of long fragments of DNA and re- After purification and recovery, the sequencing adapters were ligated. However, the purification and recovery operation not only causes the loss of DNA samples, but also significantly increases the time consumption of sequencing library construction. These deficiencies prevent the conventional PacBio sequencing library construction method from being effectively applied to rare human sample...

Claims

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Application Information

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IPC IPC(8): C12Q1/6806C12N15/10C40B50/06
CPCC12Q1/6806C12N15/1093C40B50/06C12Q2525/191C12Q2525/301C12Q2535/122C12Q2521/501
Inventor 张勇贾行星谭生军蔡英傲张雅琼
Owner INST OF ZOOLOGY CHINESE ACAD OF SCI
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