
Flavonoid is an important group of plant secondary metabolites. The biosynthesis of this flavonoid group can be precisely regulated by many environmental factors. Currently, histone variants have been documented as important factors in the regulation of eukaryotic gene expression. H2A.Z histone variant has been found to function in numerous plant physiological programs including flavonoid biosynthesis. Moreover, the environmental changes have been shown to significantly influence the replacement between histone proteins and their variants leading to alterations in gene expression. Based on the recent studies, this mini-review is to provide an updated view on the functions of histone variant H2A.Z in the regulation of flavonoid biosynthetic gene expression. In addition, this also suggests a model in which the H2A.Z-containing nucleosomes can be evicted upon environmental stress conditions to facilitate the targeting of transcriptional activators to these flavonoid biosynthetic genes resulting in gene activation and flavonoid accumulation in Arabidopsis plants.
Citation: Nguyen Hoai Nguyen. Histone variant H2A.Z and transcriptional activators may antagonistically regulate flavonoid biosynthesis[J]. AIMS Bioengineering, 2020, 7(1): 55-59. doi: 10.3934/bioeng.2020005
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Flavonoid is an important group of plant secondary metabolites. The biosynthesis of this flavonoid group can be precisely regulated by many environmental factors. Currently, histone variants have been documented as important factors in the regulation of eukaryotic gene expression. H2A.Z histone variant has been found to function in numerous plant physiological programs including flavonoid biosynthesis. Moreover, the environmental changes have been shown to significantly influence the replacement between histone proteins and their variants leading to alterations in gene expression. Based on the recent studies, this mini-review is to provide an updated view on the functions of histone variant H2A.Z in the regulation of flavonoid biosynthetic gene expression. In addition, this also suggests a model in which the H2A.Z-containing nucleosomes can be evicted upon environmental stress conditions to facilitate the targeting of transcriptional activators to these flavonoid biosynthetic genes resulting in gene activation and flavonoid accumulation in Arabidopsis plants.
The surface theory is an indispensable research topic for scientists in the fields of differential geometry, physics, engineering, and designation. One type of well-known surfaces is the ruled surfaces which are obtained by the continuous movement of a line along the curve [1,2]. Various approaches have been put forward on ruled surfaces considering the characterizations, geometric and algebraic properties of ruled the surfaces. Ruled surfaces have applications in a number of domains including geometric modeling [5] or computer aided geometric designing [3,4]. Further, the technical advantages of ruled surfaces in the realization of free-form architecture and complex shapes can be seen in [6]. Such as surfaces, the theory of curves is also an important research topic regarding various disciplines. A lot of investigation has been done on the motion, evolution, and integrability of curves. Moreover, the geometric characterizations for these integrable curves and the evolution of inelastic plane curves have been studied widely [7,8,9,10,11]. Hasimoto [12] handled the motion of the vortex filament equation has been studied by and the time evolution of the curves has been obtained. It also has been proved that the vortex filament equation (smoke ring) is equal to the nonlinear Schrödinger equation. The motion of the curves is a predecessor part of soliton theory. The geometric applications of Bäcklund and Darboux transformations between curves have been discussed in soliton theory [12,13,14]. Many researchers have examined the surfaces obtained from these curves. For instance, the evolution of translation surfaces has been studied by [15]. Additionally, by considering the inextensible flows of curves, the developable surfaces and tangent developable surfaces have been considered in [16,17,18,19] and the evolution of special ruled surfaces according to the Serret-Frenet frame has been clarified in [20]. On the other hand, the Serret-Frenet frames are inadequate for studying analytic space curves of which curvatures have discrete zero points since the principal normal and binormal vectors may be discontinuous at zero points of the curvature. For the solution of this problem, Sasai [21] has introduced an orthogonal frame and obtained a formula, which corresponds to the Frenet-Serret equation. Recently, in Minkowski 3-space, the modified orthogonal frame with non-zero curvature and torsion of a space curve has been described by Bukcu and Karacan [22]. Then, using this the modified orthogonal frame, spherical curves, Mannheim curves and some special curves have been reconsidered [23,24,25]. In the light of recent events given above, the aim of this study is to study the evolution of analytic space curve according to the modified orthogonal frame and the geometric properties of special ruled surfaces generated by the motion of these curves.
In Euclidean 3-space, Euclidean inner product is given by <,>=dx21+dx22+dx23 where x=(x1,x2,x3)∈E3. The norm of a vector x∈E3 is ‖x‖=√|<x,x>|. For any α curve, if ‖α′(s)‖=1, then α curve is unit speed curve in Euclidean space. The most well-known and used Frenet frame on a curve plays an important role in differential geometry. Let α be a space curve with respect to the arc-length s in Euclidean 3-space E3. t, n and b are tangent, principal normal and binormal unit vectors at each point α(s) of a curve α, respectively. Then there exists an orthogonal frame {t,n,b} which satisfies the Frenet-Serret equation
t′=κn,n′=−κt+τb,b′=−τn | (2.1) |
where κ is the curvature, τ is the torsion.
The fundamental theorem of regular curves states that if κ>0 and τ are differentiable functions then there exists a unit speed curve whose curvature and torsion are κ and τ, respectively [1]. However, the principal normal and binormal vectors are discontinuous at zero points of the curvature in general and the curvature is not always differentiable even if the curve is analytic. In that case, the formulation of the Frenet frame of a space curve generally established causes ambiguity for an analytical space curve at a point where the curvature vanishes, see Example 2.1.
This problem was considered by Hord [26] and Sasai [21,27] for analytic space curves of which the curvatures have discrete zero points. With a simple but convenient approach, an orthogonal frame was introduced by Sasai [21]. Although this modified orthogonal frame seems like a Frenet frame with scaled normal and binormal vectors, it allows to use a new formula corresponding to the Frenet-Serret equation for the aforementioned case and is also useful for investigating analytic curves with singularities.
Let α be an analytic curve of which curvature has discrete zero points in Euclidean 3-space. Under the assumption κ(s) of α is not identically zero, the elements of modified orthogonal frame are given by
T=dαds,N=dTds,B=T∧N |
where s is the arc-length parameter and T∧N is the vector product of T and N.
The relations between the Frenet frame {t,n,b} and modified orthogonal frame {T,N,B} at non-zero points of κ are
T=t,N=κn,B=κb. |
In the course of time, this orthogonal frame is called the modified orthogonal frame [22]. The modified orthogonal frame {T,N,B} satisfies
⟨T,T⟩=1,⟨N,N⟩=⟨B,B⟩=κ2,⟨T,N⟩=⟨T,B⟩=⟨N,B⟩=0. |
such that ⟨,⟩ is the Euclidean inner product. From these equations, the differentiation formula for the modified orthogonal frame {T,N,B} is given by
T′(s)=N(s),N′(s)=−κ2T(s)+κsκN(s)+τB(s),B′(s)=−τN(s)+κsκB(s), | (2.2) |
where κs denotes the differentiation with respect to s and τ=det(α′,α″,α‴)κ2 is the torsion of α. Here, the essential quantities κ2 and τ are analytic in [21,22].
Example 2.1. Let us consider a curve given by the parametric equation
α(s)=(1√2s∫0cos(πt22)dt,1√2s∫0sin(πt22)dt,s√2) |
which is a helical curve over clothoid (Cornu spiral or Euler spiral) [2] and has various applications in real life such as the highway, railway route design or roller coasters, etc. Here the components s∫0cos(πt22)dt and s∫0sin(πt22)dt are called Fresnel integrals. The elements of the Frenet trihedron of the curve α are obtained as
t(s)=(1√2cos(πs22),1√2sin(πs22),1√2), |
n(s)=(−s|s|sin(πs22),s|s|cos(πs22),0), |
b(s)=(−s√2|s|cos(πs22),−s√2|s|sin(πs22),s√2|s|) |
and the curvature is κ(s)=π|s|√2. Besides the curvature is not differentiable, the principal normal and binormal vectors are discontinuous at s=0 since n+≠n− and b+≠b− for n+=lims→0+limn(s), n−=lims→0−limn(s) and b+=lims→0+b(s), b−=lims→0−limb(s).
Whenever the curvature is considered as a signed quantity κ(s)=∓πs√2, the curve forms a symmetrical double spiral, see Figure 1.
To prevent the occurrence of two reverse oriented principal normal vectors and binormal vectors, it is useful to refer to the modified orthogonal frame with unique elements
T(s)=(1√2cos(πs22),1√2sin(πs22),1√2), |
N(s)=(−πs√2sin(πs22),πs√2cos(πs22),0), |
B(s)=(−πs2cos(πs22),−πs2sin(πs22),πs2), |
under the assumption that the curvature κ(s) of α is not zero. Here the essential quantities are obtained as κ2=π2s22 and τ(s)=πs√2.
A curve α in Euclidean 3-space is a vector-valued function α(s,t)∈E3 where s is the arc-length parameter and t is the time parameter, then the equation of the vortex filament (smoke ring equation) is given by
αt=αs∧αss, | (3.1) |
where the subscripts indicate the partial differential. Let α be an analytic curve with curvature having discrete zero points. To at non-zero points of the curve, the time evolution of the modified orthogonal frame {T,N,B} can be written in matrix form as follows:
[TNB]t=[0ηβ−ηκκtγ−β−γκκt][TNB] | (3.2) |
where α, β and γ are smooth functions. By considering the curvature κ of the curve α is not identically zero and using the equations Tst=Tts,Nst=Nts,Bst=Bts, we obtain
ηs=τβ−κsκη+κκt,βs=γ−τη−κsκβ,γs=τt−β. | (3.3) |
We suppose that the velocity according to the curve α is given by
αt=dαdt=aT+bN+cB. | (3.4) |
From equation αst=αts, we find the following equations
0=as−bκ2,η=a+bs+κsκb−τc,β=τb+cs+κsκc | (3.5) |
where a, b and c are the coefficients of the tangent, normal and binormal vectors of the velocity, respectively. Substituting the Eq. (3.5) into the second Equation of (3.3), we get
γ=(τb+cs+κsκc)s+τ(a+bs+κsκb−τc)+κsκ(τb+cs+κsκc). | (3.6) |
For a solution of smoke ring equation, the velocity vector is given by
αt=αs∧αss=B. | (3.7) |
Thus, from the Eqs. (3.4) and (3.7), we get
a=0,b=0,c=1. | (3.8) |
Substituting the Eq. (3.8) into the Eqs. (3.5) and (3.6), we get
η=−τ,β=κsκ,γ=κssκ−τ2. | (3.9) |
Thus, according to the modified orthogonal frame, the Eq. (3.9) represents the time evolution of the curve and the motion of the curve
In this section, we study the tangent, normal and binormal ruled surfaces using the modified orthogonal frame along an analytic space curve. The parametric equation of the ruled surface is given by
X(s,v)=α(s)+vl(s), |
where α(s) is called the base curve and l(s) is the director curve. If the curves α(s) and l(s) move with time t, then the equation of the ruled surface is as follows
X(s,v,t)=α(s,t)+vl(s,t). | (4.1) |
The ruled surface generated by the motion of the tangent vector T of a curve α is called the tangent ruled surface and the equation of this surface is represented by
X(s,v,t)=α(s,t)+vT(s,t). | (4.2) |
Example 4.1. Let us consider the helical curve over clothoid given in Example 2.1. Then the parametric equation of tangent ruled surface is
φ(s,v)=(1√2(s∫0cos(πt22)dt+vcos(πs22)),1√2(s∫0sin(πt22)dt+vsin(πs22)),s+v√2), |
see Figure 2.
The partial differentiations of the equations of the tangent ruled surface are
Xs(s,v,t)=T+vN,Xv(s,v,t)=T, | (4.3) |
By using the Eq. (4.3), we get the unit normal field of this surface as
U=Xs∧Xv‖Xs∧Xv‖=−Bκ. | (4.4) |
The first fundamental form of the tangent ruled surface in Euclidean space is given by
I=⟨dX,dX⟩=⟨Xsds+Xvdv,Xsds+Xvdv⟩=Eds2+2Fdsdv+Gdv2 |
where the coefficients of the first fundamental form are
E=⟨Xs,Xs⟩=1+vκ2,F=⟨Xs,Xv⟩=1,G=⟨Xv,Xv⟩=1. | (4.5) |
From Eq. (4.3), the second derivatives are found and given as
Xss(s,v,t)=−vκ2T+(1+vκsκ)N+vτB,Xsv(s,v,t)=N,Xvv(s,v,t)=0. | (4.6) |
The second fundamental form of the normal surface is given by
II=⟨dX,dU⟩=−⟨dX,dU⟩=⟨Xsds+Xvdv,Usds+Uvdv⟩=eds2+2fdsdv+gdt2 |
where the coefficients of the second fundamental form are
e=⟨Xss,U⟩=−vτκ,f=⟨Xsv,U⟩=0,g=⟨Xvv,U⟩=0. | (4.7) |
Corollary 4.1. The Gaussian and mean the curvatures of the tangent ruled surface X=X(s,v,t) are
K=0, | (4.8) |
H=−τ2vκ, | (4.9) |
respectively.
Proof. From the Eqs. (4.5) and (4.7), we easily obtain the Gaussian curvature and the mean curvature, respectively, as follows
K=eg−f2EG−F2=0, |
H=12Eg−2Ff+GeEG−F2=−τ2vκ |
From the Eqs. (4.8) and (4.9) the followings are obvious.
Corollary 4.2.
ⅰ. The tangent ruled surface is developable.
ⅱ. The tangent ruled surface is minimal surface if τ=0.
The ruled surface generated by the motion of the normal vector N of the curve α is called the normal ruled surface and the equation of this surface is
X(s,v,t)=α(s,t)+vN(s,t). | (4.10) |
Example 4.2. If we take the curve given in Example 2.1, then the parametric equations of normal ruled surfaces generated by normal vectors of Frenet frame and modified orthogonal frame are
φ1(s,v)=(1√2s∫0cos(πt22)dt−vs|s|sin(πs22),1√2s∫0sin(πt22)dt+vs|s|cos(πs22),s√2) |
and
φ2(s,v)=(1√2(s∫0cos(πt22)dt−vπssin(πs22)),1√2(s∫0sin(πt22)dt+vπscos(πs22)),s√2), |
respectively. The first normal ruled surface is generated by the normal vector of Frenet frame and it is discontinuous at s=0 and the second one is generated by the normal vector of the modified orthogonal frame, see Figure 3.
The derivatives of the normal ruled surface with respect to s and v are
Xs(s,v,t)=(1−vκ2)T+vκsκN+vτB,Xv(s,v,t)=N, | (4.11) |
respectively. Using Eq. (4.11), we get the unit normal field of this surface is found as
U=Xs∧Xv‖Xs∧Xv‖=−vτT+(1−vκ2)B√(1−vκ2)2κ2+(vτ)2. | (4.12) |
The first fundamental form of the normal ruled surface in Euclidean space is given by
I=⟨dX,dX⟩=⟨Xsds+Xvdv,Xsds+Xvdv⟩=Eds2+2Fdsdv+Gdv2 |
where the coefficients of the first fundamental form are
E=⟨Xs,Xs⟩=(1−vκ2)2+v2κs2+v2τ2κ2,F=⟨Xs,Xv⟩=vκsκ,G=⟨Xv,Xv⟩=κ2. | (4.13) |
From Eq. (4.11), the second derivative is found as
Xss(s,v,t)=−3vκκsT+(1−vκ2+vκssκ−vτ2)N+(vτs+2vτκsκ)B,Xsv(s,v,t)=−κ2T+κsκN+τB,Xvv(s,v,t)=0. | (4.14) |
The second fundamental form of the normal surface is given by
II=⟨dX,dU⟩=−⟨dX,dU⟩=⟨Xsds+Xvdv,Usds+Uvdv⟩=eds2+2fdsdv+gdt2 |
where the coefficients of the second fundamental form are
e=⟨Xss,U⟩=vκ(3vτκs+(1−vκ2)(κτs+2τκs))√(κ(1−vκ2))2+(vτ)2,f=⟨Xsv,U⟩=κ2τ(1+v−vκ2)√(κ(1−vκ2))2+(vτ)2,g=⟨Xvv,U⟩=0. | (4.15) |
Corollary 4.3. The Gaussian and mean the curvatures of a normal ruled surface X=X(s,v,t) are
K=−τ2κ2(1+v−vκ2)2((κ(1−vκ2))2+(vτ)2)((1−vκ2)2+(vτκ)2), | (4.16) |
H=vκ(vτκs+(1−vκ2)κτs)2((κ(1−vκ2))2+(vτ)2)12((1−vκ2)2+(vτκ)2), | (4.17) |
respectively.
Proof. From the Eqs. (4.13) and (4.15), we easily obtain the Gaussian curvature and the mean curvature respectively as follows
K=eg−f2EG−F2=−τ2κ2(1+v−vκ2)2((κ(1−vκ2))2+(vτ)2)((1−vκ2)2+(vτκ)2), |
H=12Eg−2Ff+GeEG−F2=vκ(vτκs+(1−vκ2)κτs)2((κ(1−vκ2))2+(vτ)2)12((1−vκ2)2+(vτκ)2). |
From the Eqs. (4.16) and (4.17), the following result is obvious.
Corollary 4.4. The normal ruled surface is developable iff τ=0 and minimal iff vτκs+(1−vκ2)κτs=0.
The ruled surface generated by the motion of the binormal vector B of the curve α is called the binormal ruled surface and the equation of this surface is
X(s,v,t)=α(s,t)+vB(s,t). | (4.18) |
Example 4.3. The parametric equations of binormal ruled surfaces generated by binormal vectors of Frenet frame and modified orthogonal frame the curve given in Example 2.1 are
φ3(s,v)=(1√2(s∫0cos(πt22)dt−vs|s|cos(πs22)),1√2(s∫0sin(πt22)dt−vs|s|cos(πs22)),1√2(s+vs|s|)) |
and
φ4(s,v)=(1√2s∫0cos(πt22)dt−vπs2cos(πs22),1√2s∫0sin(πt22)dt−vπs2sin(πs22),s√2(1+vπ√2)), |
respectively. The first surface (generated by binormal vector of Frenet frame) is discontinuous at s=0 and the second one is generated by binormal vector of modified orthogonal frame, see Figure 4.
The tangent vectors for the binormal ruled surface are
Xs(s,v,t)=T−vτN+vκsκB,Xv(s,v,t)=B, | (4.19) |
where the subscripts s and v represent partial derivatives of the binormal ruled surface. Using Eq. (4.19), we get the unit normal field of this surface is found as
U=Xs∧Xv‖Xs∧Xv‖=−vτT−N√κ2+(vτ)2. | (4.20) |
The first fundamental form of the normal ruled surface in Euclidean space is given by
I=⟨dX,dX⟩=⟨Xsds+Xvdv,Xsds+Xvdv⟩=Eds2+2Fdsdv+Gdv2 |
where the coefficients of the first fundamental form are
E=⟨Xs,Xs⟩=1+v2τ2κ2+v2κs2,F=⟨Xs,Xv⟩=vκsκ,G=⟨Xv,Xv⟩=κ2. | (4.21) |
From the Eq. (4.19), the second derivative is found and given as
Xss(s,v,t)=(vτκ2)T+(1−vτs−2vτκsκ)N+(−vτ2+vκssκ)B,Xsv(s,v,t)=−τN+κsκB,Xvv(s,v,t)=0. | (4.22) |
The second fundamental form of the normal surface is given by
II=⟨dX,dU⟩=−⟨dX,dU⟩=⟨Xsds+Xvdv,Usds+Uvdv⟩=eds2+2fdsdv+gdt2 |
where the coefficients of the second fundamental form are
e=⟨Xss,U⟩=κ2(−v2τ2−1+vτs+2vτκsκ)√κ2+(vτ)2,f=⟨Xsv,U⟩=κ2τ√κ2+(vτ)2,g=⟨Xvv,U⟩=0. | (4.23) |
Corollary 4.5. For the binormal ruled surface X=X(s,v,t) the Gaussian and mean the curvatures are
K=−τ2(κ2+(vτ)2)(1+(vτκ)2), | (4.24) |
H=κ2(vτs−(vτ)2−1)2(κ2+(vτ)2)12(1+(vτκ)2), | (4.25) |
respectively.
Proof. From the Eqs. (4.21) and (4.23), we easily obtain the Gaussian curvature and the mean curvature respectively as follows
K=eg−f2EG−F2=−τ2(κ2+(vτ)2)(1+(vτκ)2), |
H=12Eg−2Ff+GeEG−F2=κ2(vτs−(vτ)2−1)2(κ2+(vτ)2)12(1+(vτκ)2). |
Corollary 4.6. From the Eqs. (4.16) and (4.17), the normal ruled surface is developable iff τ=0 and minimal iff vτs−(vτ)2−1=0.
The authors declare no conflict of interest.
[1] |
Nakabayashi R, Yonekura-Sakakibara K, Urano K, et al. (2014) Enhancement of oxidative and drought tolerance in Arabidopsis by overaccumulation of antioxidant flavonoids. Plant J 77: 367-379. doi: 10.1111/tpj.12388
![]() |
[2] |
Nguyen NH, Kim JH, Kwon J, et al. (2016) Characterization of Arabidopsis thaliana FLAVONOL SYNTHASE 1 (FLS1)-overexpression plants in response to abiotic stress. Plant Physiol Biochem 103: 133-142. doi: 10.1016/j.plaphy.2016.03.010
![]() |
[3] |
Peer WA, Murphy AS (2007) Flavonoids and auxin transport: modulators or regulators? Trends Plant Sci 12: 556-563. doi: 10.1016/j.tplants.2007.10.003
![]() |
[4] |
Winkel-Shirley B (2002) Biosynthesis of flavonoids and effects of stress. Curr Opin Plant Biol 5: 218-223. doi: 10.1016/S1369-5266(02)00256-X
![]() |
[5] |
Nguyen NH, Jeong CY, Kang GH, et al. (2015) MYBD employed by HY5 increases anthocyanin accumulation via repression of MYBL2 in Arabidopsis. Plant J 84: 1192-1205. doi: 10.1111/tpj.13077
![]() |
[6] |
Kim S, Hwang G, Lee S, et al. (2017) High ambient temperature represses anthocyanin biosynthesis through degradation of HY5. Front Plant Sci 8: 1787. doi: 10.3389/fpls.2017.01787
![]() |
[7] |
Cai HY, Zhang M, Chai MN, et al. (2019) Epigenetic regulation of anthocyanin biosynthesis by an antagonistic interaction between H2A.Z and H3K4me3. New Phytol 221: 295-308. doi: 10.1111/nph.15306
![]() |
[8] |
Mehrtens F, Kranz H, Bednarek P, et al. (2005) The Arabidopsis transcription factor MYB12 is a flavonol-specific regulator of phenylpropanoid biosynthesis. Plant Physiol 138: 1083-1096. doi: 10.1104/pp.104.058032
![]() |
[9] |
Stracke R, Ishihara H, Huep G, et al. (2007) Differential regulation of closely related R2R3-MYB transcription factors controls flavonol accumulation in different parts of the Arabidopsis thaliana seedling. Plant J 50: 660-677. doi: 10.1111/j.1365-313X.2007.03078.x
![]() |
[10] |
Richmond TJ, Finch JT, Rushton B, et al. (1984) Structure of the nucleosome core particle at 7Å resolution. Nature 311: 532-537. doi: 10.1038/311532a0
![]() |
[11] | Kim JM, Sasaki T, Ueda M, et al. (2015) Chromatin changes in response to drought, salinity, heat, and cold stresses in plants. Front Plant Sci 6: 114. |
[12] |
Lai WKM, Pugh BF (2017) Understanding nucleosome dynamics and their links to gene expression and DNA replication. Nat Rev Mol Cell Bio 18: 548-562. doi: 10.1038/nrm.2017.47
![]() |
[13] |
Kumar SV, Wigge PA (2010) H2A.Z-containing nucleosomes mediate the thermosensory response in Arabidopsis. Cell 140: 136-147. doi: 10.1016/j.cell.2009.11.006
![]() |
[14] |
Smith AP, Jain A, Deal RB, et al. (2010) Histone H2A.Z regulates the expression of several classes of phosphate starvation response genes but not as a transcriptional activator. Plant Physiol 152: 217-225. doi: 10.1104/pp.109.145532
![]() |
[15] |
Sura W, Kabza M, Karlowski WM, et al. (2017) Dual role of the histone variant H2A. Z in transcriptional regulation of stress-response genes. Plant Cell 29: 791-807. doi: 10.1105/tpc.16.00573
![]() |
[16] |
Nguyen NH, Cheong JJ (2018) H2A.Z-containing nucleosomes are evicted to activate AtMYB44 transcription in response to salt stress. Biochem Biophys Res Commun 499: 1039-1043. doi: 10.1016/j.bbrc.2018.04.048
![]() |
[17] |
Hu GQ, Cui KR, Northrup D, et al. (2013) H2A. Z facilitates access of active and repressive complexes to chromatin in embryonic stem cell self-renewal and differentiation. Cell Stem Cell 12: 180-192. doi: 10.1016/j.stem.2012.11.003
![]() |
[18] |
Schuettengruber B, Chourrout D, Vervoort M, et al. (2007) Genome regulation by polycomb and trithorax proteins. Cell 128: 735-745. doi: 10.1016/j.cell.2007.02.009
![]() |
[19] |
Xu ML, Leichty AR, Hu TQ, et al. (2018) H2A.Z promotes the transcription of MIR156A and MIR156C in Arabidopsis by facilitating the deposition of H3K4me3. Development 145: dev152868. doi: 10.1242/dev.152868
![]() |
[20] |
Dai X, Bai Y, Zhao L, et al. (2017) H2A. Z represses gene expression by modulating promoter nucleosome structure and enhancer histone modifications in Arabidopsis. Mol Plant 10: 1274-1292. doi: 10.1016/j.molp.2017.09.007
![]() |
[21] |
Kumar SV, Lucyshyn D, Jaeger KE, et al. (2012) Transcription factor PIF4 controls the thermosensory activation of flowering. Nature 484: 242-245. doi: 10.1038/nature10928
![]() |
[22] |
Borevitz JO, Xia YJ, Blount J, et al. (2000) Activation tagging identifies a conserved MYB regulator of phenylpropanoid biosynthesis. Plant Cell 12: 2383-2393. doi: 10.1105/tpc.12.12.2383
![]() |
[23] |
Shin J, Park E, Choi G (2007) PIF3 regulates anthocyanin biosynthesis in an HY5-dependent manner with both factors directly binding anthocyanin biosynthetic gene promoters in Arabidopsis. Plant J 49: 981-994. doi: 10.1111/j.1365-313X.2006.03021.x
![]() |
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