CN109750037A - One kind specifically expressed promoter PCHF40 and its application in paddy pollen - Google Patents

Abstract

Specifically expressed promoter PCHF40 and its application in paddy pollen that the invention discloses one kind, are related to genetic engineering and molecular biology field.Promoter PCHF40 of the present invention has nucleotide sequence shown in SEQ ID NO.1, the present invention further provides the expression vector containing promoter PCHF40, expression casette, engineering bacteria or cell line.The present invention also provides the primer pairs of amplification pollen specific promoter.Pollen-specific promoter of the invention is rice endogenous gene, highly beneficial to paddy gene engineering, can drive that foreign gene is specific expressed in pollen and expression is accurate, provides driving foreign gene new method specific expressed in paddy pollen.

Description

One kind specifically expressed promoter PCHF40 and its application in paddy pollen

Technical field

The present invention relates to genetic engineerings and molecular biology field, specifically, being related to paddy pollen specificity promoter PCHF40 and its application.

Background technique

Transcriptional control is one of principal mode of control of plant gene expression, by cis-acting elements and trans-acting factor Coordinate to complete.Promoter is one of most important cis element in plant gene transcription regulation, is normally at gene 5 ' and holds upstream, It is identification and the binding site of RNA polymerase and some trans-acting factors.Promoter mainly includes core promoter Qu Yuzhuan Record two functional areas of control region.Core promoter area is the most short promoter fragment of starting transcription, and generally 40nt is one section of quilt DNA sequence dna RNA polymerase family I, II and III identification and combined.This region includes some important function element, Neng Gouzhun True positioning transcriptional start point and direction are the bases of gene expression regulation.Transcription regulating region is located at the upstream of core promoter (or downstream), can be combined with special transcription factor to the space-time of transcription and it is strong and weak play regulating and controlling effect, such as enhancer and Silencer etc..The expression pattern of further investigation promoter not only improves the expression and regulation mechanism and biological function for understanding gene, Facilitate the expression of control foreign gene again.

Promoter can be divided into constitutive promoter, inducible promoter and space-time specific promoter etc. by its expression way Three classes.Constitutive promoter promotor gene can transcribe in all or most of tissues, and gene expression is made to have space-time duration With expression quantity constancy.The 35S promoter of tobacco mosaic virus (TMV), the Actin promoter of rice and the Ubiquitin of corn are opened Mover belongs to constitutive promoter.Constitutive promoter is widely used in the genetic engineering research of plant, is used for target base Cause, such as pest-resistant and anti-herbicide gene overexpression.Inducible promoter can open under the stimulation of certain physically or chemically signals Move or greatly improve gene expression.They have the sequential structure of enhancer, silencer or similar functions, and have apparent single-minded Property.Inducible promoter can be divided into photoinduction promoter, heat shock promoter, low temperature induction according to the difference of inducement signal and open Mover, drought-induced promoter, wound-induced promoter, hormone induction promoter etc..Space-time specific promoter is only specific Growth phase or position in promotor gene expression.Tissue-specific promoter is one kind of space-time specific promoter, is only existed Start expression in specific cells, tissue or organ.It is controlled in the genetic transformation of plant with the promoter of organizing specific expression The expression of target gene can more effectively avoid such as can be reduced composing type table using the potential negative interaction of constitutive promoter bring Up to increased metabolic burden, reduction Safety of GM Food risk and to the adverse effect with environment, and reuse identical The gene silencing etc. that promoter causes.The type of current developed rice tissue specific promoter is varied, root, stem, Leaf, seed and fruit etc. have almost had been found that organized specific expressed promoter in various tissues.

Male sterility is the basis of heterosis utilization, is the core technology of hybrid rice industry, Study On Rice fertility tune The mechanism of control has great theoretical and practical significance.Anther is that rice generates mature male gametophyte (i.e. pollen or microspore) Organ.In the early stage of anther development, there are a kind of primary sporogenous cell, which passes through a series of divisions and differentiation, produces Raw tapetum and pollen mother cell.Tapetum provides nutrition, including various enzymes and non-enzymatic albuminoid for the development of male gametophyte Matter, and participate in the synthesis of exposore.Pollen mother cell then carries out meiosis, generates tetrad.It is unicellular in tetrad Effect through tapetum secretion callosity enzyme separates Haploid production microsporinite.Monoploid microsporinite is further developed, to evening The big vacuole in center is formed when the phase.Central big vacuole squeezes nucleus to cell edges (referred to as mid-late uninucleate stage), forms cell Polarity.This cell polarity promotes microsporinite to carry out primary unequal mitosis, generates a big vegetative cell and one A small reproduction cell.Small reproduction cell is completely contained in big vegetative cell, and cell is special existing in formation cell As.Reproduction cell then carries out second of mitosis, generates two spermatids, forms mature pollen grain.Therefore, screening and Paddy pollen specific promoter is determined by for the genetic engineering of rice, especially in the side such as sterility changing and transgenosis drift prevention and control Face provides new selection.

Summary of the invention

The object of the present invention is to provide a kind of plant pollen specificity promoter and its applications.

A kind of plant pollen specificity promoter PCHF40 provided by the invention, to include

1) nucleotide sequence shown in SEQ ID No:1,

Or 2) in the nucleotide sequence shown in SEQ ID No:1 it is substituted, lacks or adds one or several nucleotide And the nucleotide sequence as derived from 1) with same pollen specific startup function；

Or 3) the sequence complementary with nucleotide sequence shown in SEQ ID No:1.

Wherein, the nucleotide sequence as derived from 1) described in 2), the nucleotides sequence described in 1) is classified as to be had compared with 1) 70% or more homology, 80% or more homology, 85% or more homology, 90% or more homology, 95% or more homology, 98% or more homology or 99% or more homology, and the nucleotide sequence with same pollen specific promoter function.

Those skilled in the art can easily identify and utilize and plant pollen specificity promoter according to identical purpose Therefore the DNA molecular of PCHF40 nucleotide sequence complementation has promoter activity and can start under strict conditions with the present invention The DNA sequence dna of subsequence or the hybridization of its segment is included in the invention.Wherein, the nucleotide sequence is complementary, refers to stringent Under the conditions of can hybridize with PCHF40.

It is more than to hybridize with other sequences (as at least that stringent condition, which refers to that probe will be hybridized to detectable degree with its target sequence, 2 times of backgrounds) condition.Stringent condition has sequence dependent, and different because of the difference of the other conditions of experiment.Pass through control The stringency of hybridization and/or wash conditions, can identify the target sequence complementary with probe 100% (same to source detection).Selectively, Adjustable stringent condition is to allow some sequence mismatch, so that detecting the similitude (heterologous detection) of lower degree.In general, Probe length is no more than 1000 nucleotide, is preferably shorter than 500 nucleotide.

Typically, stringent condition is that salinity is lower than about 1.5M Na ion at pH value 7.0-8.3, typically about 0.01-1.0M Na ion concentration (or other salts), temperature are right at least about 30 DEG C of short probe (such as 10-50 nucleotide) At least about 60 DEG C of long probe (such as more than 50 nucleotide).It also can get stringent item by adding destabilizing agent such as formamide Part.Low stringency condition, it may for example comprise molten in 30-35% formamide, 1M NaCl, the buffering of l%SDS (dodecyl sodium sulfate) 37 DEG C of hybridization in liquid, 1 × the 50-55 DEG C of washing into 2 × SSC (20 × SSC=3.0M NaCl/0.3M trisodium citrate).In Spend stringent condition, it may for example comprise 40-45% formamide, 1.0M NaCl, l%SDS buffer solution in 37 DEG C hybridization, 0.5 × 55-60 DEG C of the washing into 1 × SSC.High stringency, it may for example comprise in 50% formamide, 1M NaCl, l%SDS Buffer solution in 37 DEG C hybridization, in 0.1 × SSC 60-65 DEG C washing.Optionally, washing buffer can be containing about The SDS of 0.1%-1%.Hybridization time is generally less than about 24 hours, generally about 4-12 hours.

Especially typically the function of post-hybridization washing, key factor are the ionic strength and temperature of final washing solution. For DNA-DNA hybrid, Tm can be from the equation of Meinkoth and Wahl (Anal Biochem, 1984,138:267-284) Estimation: Tm=81.5 DEG C+16.6 (logM)+0.41 (%GC) -0.61 (%form) -500/L；Wherein M is univalent cation Molar concentration, %GC are the percentage of guanylic acid and cytidylic acid in DNA, and %form is that formamide is hybridizing Percentage in solution, L are length of the hybrid in base-pair.Tm is that 50% complementary target sequence hybridizes with complete pairing probe Temperature (under defined ionic strength and pH).Every 1% mispairing needs Tm to reduce about l DEG C；Therefore, Tm hybridizes and/or washes The condition of washing can be conditioned to hybridize with the sequence of required identity.For example, if the sequence sought has >=90% identity, Tm can reduce by 10 DEG C.Generally, the stringent condition of selection is less than about 5 DEG C of thermal melting point (Tm) of particular sequence, and It is complementary under defined ionic strength and pH.But high stringency can be using lower than thermal melting point (Tm) 1,2,3 Or 4 DEG C of hybridization and/or washing；Moderate stringency can be using miscellaneous lower than 6,7,8,9 or 10 DEG C of thermal melting point (Tm) It hands over and/or washs；Low stringency conditions can apply hybridization of 11,12,13,14,15 or 20 DEG C lower than thermal melting point (Tm) And/or washing.Those of ordinary skill in the art can understand that hybridization and/or the condition of washing solution become with the variation of stringency Change, and the hybridization of this equation calculation of application and cleaning compositions and required Tm.If required extent of mismatch makes Tm lower than 45 DEG C (aqueous solution) or 32 DEG C (formamide solution), preferably increase SSC concentration is to be able to use higher temperature.The guide of nucleic acid hybridization See Tijssen (1993) biochemistry and the nucleic acid probe hybridization of Molecular Biology Lab's technology one, part i, the 2nd chapter (Elsevier, New York)；With Ausubel et al. editor the 2nd chapter (Greene of (1995) Current Protocols method Publishing and Wiley-Interscience,New York).See Sambrook et al. (1989) molecular cloning: experiment Room handbook (second edition, Cold Spring Harbor Laboratory Press, Plainview, NewYork).

The stringent condition is preferably the solution in 6 × SSC (sodium citrate), 0.5%SDS (dodecyl sodium sulfate) In, hybridize at 65 DEG C, is then respectively washed film 1 time with 2 × SSC, 0.1%SDS and 1 × SSC, 0.1%SDS.

The present invention provides the expression casette containing plant pollen specificity promoter PCHF40 of the present invention, expression carries Body and host cell containing the expression vector.

The expression casette has structural gene for the downstream connection in pollen specific promoter PCHF40, adjusts base Because of the antisense gene of, structural gene, the table of MicroRNA gene that adjusts the antisense gene of gene or can interfere with endogenous gene expression Up to box.

The present invention further provides the plants of the expression casette containing above-mentioned pollen specific promoter PCHF40.

The present invention provides above-mentioned paddy pollen specificity promoter PCHF40 or the expression cassette containing it, expression vector or The host cell application specific expressed in plant pollen in driving foreign gene.

The present invention provides paddy pollen specificity promoter PCHF40 or contain its expression cassette, expression vector or host Application of the cell in prepare transgenosis plant.

The genetically modified plants are foreign gene specifically expressed genetically modified plants in pollen, preferably pollination/fertilization Ability enhancing/weakening genetically modified plants, more preferably male sterility genetically modified plants.

The plant includes but not limited to rice, corn, jowar, barley, oat, wheat, grain, sugarcane, soybean, Btassica Species, cotton, safflower, tobacco, clover and sunflower.

The present invention also provides the primer pair for expanding the pollen specific promoter PCHF40, the nucleosides of the primer pair Acid sequence is SEQ ID NO:2-3.

The present invention provides a kind of method for separating pollen specific promoter PCHF40, to use SEQ ID NO:2-3 The nucleotide sequence of primer pair PCR amplification pollen specific promoter PCHF40.

The present invention also provides driving foreign gene specifically expressed methods in pollen, include the following steps:

Paddy pollen specificity promoter PCHF40 and purpose exogenous gene cloning of the invention are contained into carrier There is the recombinant expression carrier of the expression cassette of PCHF40 and purpose foreign gene, and be introduced into Plant Genome, obtains external source base Because of the specifically expressed genetically modified plants in pollen.

Pollen-specific promoter PCHF40 provided by the invention has the advantages that

1) PCHF40 is rice DNA sequence endogeneous, and Transgene-safty risk is extremely low.

2) PCHF40 can drive foreign gene specific expressed in pollen, and expression is accurate.

3) the present invention provides a kind of new methods that driving foreign gene is specific expressed in pollen.

Detailed description of the invention

Fig. 1 is the recombinant expression carrier 1300gus-PCHF40 building of anther specific promoter PCHF40 in embodiment 2 Flow chart.

Fig. 2 is that 11 Rice Anthers and pollen GUS stained photographs are spent in non-transgenic.

Fig. 3 is 1300gus-PCHF40 transgenic paddy rice anther and pollen GUS stained photographs in embodiment 4.

Fig. 4 is 1300gus-PCHF40 transgenic paddy rice gynoecium (A) in embodiment 4, glume (B), root (C), leaf (D), stem (E) GUS stained photographs.

Specific embodiment

The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..Without departing substantially from spirit of that invention In the case where essence, to modifications or substitutions made by the method for the present invention, step or condition, all belong to the scope of the present invention.

Unless otherwise specified, the conventional means that technological means used in embodiment is well known to those skilled in the art.

The acquisition of 1 paddy pollen specificity promoter PCHF40 of embodiment

1. the extraction of oryza sativa genomic dna

Oryza sativa genomic dna is extracted using plant DNA Isolation kit (Chengdu Fu Ji Bioisystech Co., Ltd).Gene Group derives from the Fresh leaves of rice varieties OryzasativaLcv.Nipponbare.It is saved backup after the genomic DNA packing of extraction in -20 DEG C.

2.PCHF40 PCR primer design and amplification

Design of primers uses Gibson Assembly method, and amplified production is inserted into 1300GUSplus carrier (will GUSplus element be inserted into pC1300 multiple cloning sites obtain) Nco I and Hind III digestion site.Amplification PCHF40's draws Object sequence is as shown in SEQ ID NO:2 and SEQ ID NO:3.Wherein there are 15 nucleotide sequences at the end of upstream and downstream primer 5 ' and carry The corresponding link position overlapping of body, so as to Gibson Assembly connection.

PCR reaction system (100 μ L): DNA profiling: 3 μ L (50ng), KOD polymerase (be purchased from Japan mill company): 2 μ L, 10 × buffer:10 μ L, 10 μM of forward primers: 3 μ L, 10 μM of reverse primers: 3 μ L, 10 μM of dNTP:10 μ L, MgSO₄: 4 μ L, 1/ 10DMSO:20 μ L, ddH₂O:45 μ L.

PCR program: 95 DEG C of initial denaturation, 4min.94 DEG C of denaturation, 30s；50 DEG C of annealing, 30s；Extend 68 DEG C, 2min；35 Circulation.Extend 68 DEG C, 10min.

Amplified production includes the pollen specific promoter PCHF40 (sequence such as SEQ ID NO:1) of 2034bp.

The recombinant expression carrier p1300gus-PCHF40 of the building of embodiment 2 promoter PCHF40

The PCR product obtained in embodiment 1 is subjected to electrophoresis, recycling 2034bp or so size in 1% Ago-Gel Band.With Nco I and Hind III double digestion carrier p1300GUSplus, linear digestion carrier is recycled.

With Lightening Cloning Kit (Jin Fusai (Beijing) Biotechnology Co., Ltd) to PCR recovery product and Linearisation p1300GUSplus empty carrier is attached, and 10 μ L systems are as follows: 2.5 μ L recovery products (50ng/ μ L), 0.5 μ L enzyme It cuts carrier (100ng/ μ L), 2.5 μ L Ligation Mix.Linker: 50 DEG C, 60min.

Take the above-mentioned 5 electroporated competent escherichia coli cell of μ L of connection product.Use primer SEQ ID NO:4 and SEQ ID NO:5 carries out bacterium colony PCR, selects positive colony sequencing verifying.Correct carrier is sequenced and is named as p1300gus-PCHF40 (Fig. 1).P1300GUSplus carrier contains gus gene.Blue is presented in the tissue of expression gus gene after dyeing, and can be used for referring to Show the expressive site and intensity of promoter.

The acquisition of the rice of 3 turns of p1300gus-PCHF40 of embodiment

Take the Agrobacterium EHA105 of -70 DEG C of preservations in containing 50 μ g/mL rifampin plate streakings, 28 DEG C of cultures.Picking single bacterium It falls and is inoculated in 50mL YEB fluid nutrient medium, 28 DEG C of shaken cultivation 12-16hr of 220rpm.Take the switching of 2mL bacterium solution in 100mL In (containing antibiotic) YEB fluid nutrient medium, 28 DEG C of 220rpm shaken cultivations to OD600=0.5.It is pre-chilled 10 minutes on ice, 5000rpm is centrifuged 10min (refrigerated centrifuge is pre-chilled to 4 DEG C).Aseptic deionized water is washed 2 times (each 10mL), and 10% glycerol washes 1 It is secondary to be dissolved in 10% glycerol of 3mL.100 μ L competent cells are taken to add p1300gus-PCHF40 matter obtained in 1 μ L embodiment 1 Grain, 2.5KV are electroporated.28 DEG C of cultures, select positive colony on YEB culture plate containing kanamycin and rifampin, use P1300GUSplus vector-specific primers SEQ ID NO:4 and SEQ ID NO:5 carries out PCR verifying.

Verifying is correctly cloned, and is infected by Agrobacterium-mediated genetic transformation method and is spent 11 (Hiei Y Ohta in rice S,Komari T,Kumashiro T(1994)Efficient transformation of rice(Oryza sativa L.) mediated by Agrobacterium and sequence analysis of the boundaries of the T- DNA.The Plant Journal 6:271-282).Through co-cultivation, the links such as screening, breaks up, takes root and obtain T₀For transgenosis Seedling.The blade total DNA for extracting transformed plant carries out PCR positive detection using primer SEQ ID NO:6 and SEQ ID NO:7, The positive plant cultivation verified through PCR is chosen, self-fertility obtains T₁Generation.Take T₀Or T₁Subsequent analysis is carried out for plant.

4 transgenic paddy rice GUS staining analysis of embodiment

Prepare GUS dyeing liquor X-Gluc reaction solution (50mM phosphoric acid receives buffer, pH value 7.0, the 0.5mM potassium ferricyanide, 0.5mM potassium ferrocyanide, 0.5mg/ml X-Gluc, 20% methanol of volumn concentration, 0.1%Triton X-100), at random Choose the tissue samples such as 5 or more the transgenic positive strain obtained in embodiment 3 acquisition anther, gynoecium, glume, root, leaf, stems Product are immersed in 37 DEG C of 2h in X-Gluc reaction solution or stay overnight, and the leaf for then sloughing tissue with 75% ethyl alcohol of volumn concentration is green Photograph is observed after body color.As a result as shown in Figures 2 to 4, spend 11 pollen that cannot dye (Fig. 2) in wild type, and transgenosis The pollen of rice has half to be dyed to blue (Fig. 3), other gynoeciums (A of Fig. 4), glume (B of Fig. 4), root (C of Fig. 4), leaf The tissues such as (D of Fig. 4), stem (E of Fig. 4) cannot be colored, and show that PCHF40 promoter can drive gus gene in paddy pollen In it is specific expressed.

Although above the present invention is described in detail with a general description of the specific embodiments, On the basis of the present invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Cause This, these modifications or improvements, fall within the scope of the claimed invention without departing from theon the basis of the spirit of the present invention.

Sequence table

<110>Hainan Bo Lian paddy gene Science and Technology Ltd.

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Claims (10)

1. paddy pollen specificity promoter PCHF40, which is characterized in that it is with following any nucleotide sequence:

1) nucleotide sequence shown in SEQ ID NO.1；

2) one or several nucleotide are substituted, lack or added in the nucleotide sequence shown in SEQ ID NO.1 and have The function of same pollen specific promoter, the nucleotide sequence as derived from 1)；

3) nucleotide sequence complementary with nucleotide sequence shown in SEQ ID NO.1.

2. the expression casette containing paddy pollen specificity promoter PCHF40 described in claim 1.

3. the expression vector containing paddy pollen specificity promoter PCHF40 described in claim 1.

4. the host cell containing expression vector described in expression cassette described in claim 2 or claim 3.

5. paddy pollen specificity promoter PCHF40 described in claim 1 or expression cassette, expression vector or place containing it The chief cell application specific expressed in plant pollen in driving foreign gene.

6. paddy pollen specificity promoter PCHF40 described in claim 1 or expression cassette, expression vector or place containing it Application of the chief cell in prepare transgenosis plant.

7. paddy pollen specificity promoter PCHF40 described in claim 1 or expression cassette, expression vector or place containing it Application of the chief cell in prepare transgenosis rice.

8. expanding the primer pair of paddy pollen specificity promoter PCHF40 described in claim 1, which is characterized in that the primer Pair nucleotides sequence be classified as nucleotide sequence shown in SEQ ID NO:2-3.

9. paddy pollen specificity promoter PCHF40 described in claim 1 or expression cassette, expression vector or place containing it Chief cell or primer pair according to any one of claims 8 are preparing foreign gene in the specifically expressed transgenic paddy rice of paddy pollen Using.

10. the method for driving foreign gene specific expressed in plant pollen, which comprises the steps of: by water Rice pollen specific promoter PCHF40 and purpose foreign gene, which are imported into carrier, to be obtained containing PCHF40 and purpose external source base The recombinant expression carrier of the expression cassette of cause, and it is introduced into Plant Genome, it is specifically expressed in pollen to obtain foreign gene Genetically modified plants.