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Novel HBB overexpression vector and design method and application thereof

An overexpression vector and design method technology, applied to a novel HBB overexpression vector and its design method and application field, can solve the problems of low lentiviral packaging titer and the like

Pending Publication Date: 2019-08-09
INST OF HEMATOLOGY & BLOOD DISEASES HOSPITAL CHINESE ACADEMY OF MEDICAL SCI & PEKING UNION MEDICAL COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The existing HBB expression cassette of LentiGlobin is 4.8kb, which is large in length and has a low lentiviral packaging titer. Therefore, it is urgent to further streamline and optimize the HBB globin gene expression module, so as to increase the lentiviral packaging titer, improve expression stability and strength

Method used

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  • Novel HBB overexpression vector and design method and application thereof
  • Novel HBB overexpression vector and design method and application thereof
  • Novel HBB overexpression vector and design method and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0088] The optimization of embodiment 1HS2, HS3 and HS4

[0089] In this example, the reported ChIP-seq data is systematically mined, the binding motifs (Consensus motif) of trans-acting factors are analyzed, and the regulatory motifs of HS2, HS3 and HS4 are precisely located and streamlined and optimized. The specific optimization features are as follows: :

[0090] (1) As shown in Figure 3(A), the length of HS2 remains unchanged at 0.6kb, the nucleotide sequence is shown in SEQ ID NO: 1, the box is the conserved binding motif of the transcription factor, and the bold is highly conserved Base, the corresponding transcription factor name is below the box, and the condensed HS2 contains binding motifs of TAL1, GATA1, KLF1, NFE2, GR and SOX6;

[0091] (2) As shown in Figure 3(B), the length of HS3 is reduced from 0.8kb of the BB305 vector to 0.6kb, the nucleotide sequence is shown in SEQ ID NO: 2, and the box is the conserved binding motif of the transcription factor, The base...

Embodiment 2

[0093] Embodiment 2 promoter optimization

[0094] In this example, the HBB promoter was re-analyzed, and the first 0.29kb was found to be the core transcription initiation element. According to the enrichment degree of trans-acting factors in the promoter region, the first 0.29bp sequence was extracted, as shown in Figure 3 (D) The HBB promoter shown in (D), the nucleotide sequence is shown in SEQ ID NO: 4, the box is the conserved binding motif of the transcription factor, the bold is the highly conserved base, and the corresponding transcription factor is below the box Name, the condensed HBB promoter contains binding motifs of TAL1, GATA1, KLF1 and TBP;

[0095] In this embodiment, further referring to the characteristics of HPFH, the combined mutation of the HBG promoter is carried out. The mutation site is shown in Table 1. The innovative 0.3kb mutant HBG promoter obtained is shown in Figure 3 (E), and the nucleotide sequence is as follows As shown in SEQ ID NO:5, the b...

Embodiment 3

[0098] Example 3 Optimization of HBB expression cassette

[0099] In this example, the HBB locus was located in the UCSC database, and the HBB expression frame was re-analyzed: the binding motifs of a large number of cis-acting elements were enriched in the No. 1 intron and the length was relatively short, so no adjustment was made; The middle part of the intron has almost no binding motifs of important trans-acting factors, but there is a binding motif of MIER1 that represses transcription, so the 387bp MIER1 binding region was deleted in intron 2 ( Figure 4 The shaded area in ), shortening the length of the HBB expression box. As shown in Figure 3(F), the length of the simplified HBB expression frame is 1.2kb, the nucleotide sequence is shown in SEQ ID NO: 6, the uppercase italics are 5'-UTR and 3'UTR, and the uppercase is ORF box, The lowercase is an intron, the bold lowercase is the conserved sequence at both ends of the intron, the uppercase in the No. 2 intron is the s...

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Abstract

The invention provides a novel HBB overexpression vector and a design method and application thereof. The HBB overexpression vector comprises an HBB expression module; the HBB expression module comprises a DNase I core high-sensitivity site, a promoter, an HBB expression frame and a downstream high-sensitivity site which are arranged in series; the DNase I high-sensitivity site comprises HS4, HS3,HS2, 3'E and the like which are expressed in series. The total length of the HBB expression module is smaller than 4 kb. By simplifying and optimizing a cis-acting element and the HBB expression frame, not only is the length of the HBB expression module obviously shortened, but also the transcriptive activation strength of the HBB expression module is improved, and efficient, stable and specificactivation of the HBB globin gene is realized.

Description

technical field [0001] The invention belongs to the field of biotechnology, and relates to a vector and its design method and application, in particular to a novel HBB overexpression vector and its design method and application. Background technique [0002] β-thalassemia is due to gene mutations such as base substitution, deletion, deletion, and inversion at the β-globin locus (HBB, β-globin), which cause obstacles or abnormalities in the formation of β-globin peptide chains, resulting in insufficient synthesis or The complete lack makes the ratio of the two subunits of hemoglobin α and β unbalanced, and patients cannot form functional hemoglobin. At the same time, it leads to hemolytic anemia, which makes the body’s oxygen supply seriously insufficient, and severe cases are life-threatening. In my country, thalassemia has become one of the genetic diseases with the highest incidence and greatest impact in the provinces south of the Yangtze River. The thalassemia gene defe...

Claims

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Application Information

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IPC IPC(8): C12N15/867C12N15/864C12N15/66A61K38/41A61K48/00A61P7/06
CPCC12N15/86C12N15/66A61K38/41A61K48/005A61P7/06C12N2740/15043C12N2750/14143Y02A50/30
Inventor 程涛王文天张磊张孝兵张健萍池颖许静温伟付雅文杨智学
Owner INST OF HEMATOLOGY & BLOOD DISEASES HOSPITAL CHINESE ACADEMY OF MEDICAL SCI & PEKING UNION MEDICAL COLLEGE
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