Hd 5 12

[Bigg Gernes]

Whenconsidering ease of installation and total project cost, roofs with a 5/12 pitch are right in the middle of the road for both factors. This pitch is generally easier and less expensive to than something like an 11 over 12 pitch, which is very steep, but harder to move around on and install than a lower sloped 3/12 roof pitch. Middle of the road for all factors, nothing special to really consider.

A 5/12 pitched roof allows for more attic space compared to flatter roofs. The extra space can be used for more than just storing your extra Halloween decorations because the height of the ceiling portion is usually enough for an average adult to stand under. Many homeowners will convert the attic space under a 5:12 roof to a living space, extra bedroom, loft area.

When converting an attic into one of these living spaces, you'll need to keep insulation in mind and may need to get creative depending on the height from the floor to the ceilings. Insulating the attic and maximizing total air flow will prevent dampness and eventual mildew/mold growth and also extend the life of your roof over head.

The 5/12 roof pitch works well with lots of different building styles. It looks just right on classic houses and on modern ones too. This roof has a gentle slope that's not too flat or too steep, so it makes buildings look nice and balanced. It adds a nice shape to the house without being too much. This kind of roof is good for homes because it makes them look welcoming.

Similar to other medium-sloped roofs, the 5/12 pitch is has the practical benefits of shedding water and snow in a controlled manner-- not too fast and not too slow, where it could stagnate like with a low sloped pitch. Make sure you get a good gutter installation, especially if you live in the Northeast like Massachusetts or Connecticut.

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Development can be altered to match phenotypes with the environment, and the genetic mechanisms that direct such alternative phenotypes are beginning to be elucidated. Yet, the rules that govern environmental sensitivity vs. invariant development, and potential epigenetic memory, remain unknown. Here, we show that plasticity of nematode mouth forms is determined by histone 4 lysine 5 and 12 acetylation (H4K5/12ac). Acetylation in early larval stages provides a permissive chromatin state, which is susceptible to induction during the critical window of environmental sensitivity. As development proceeds deacetylation shuts off switch gene expression to end the critical period. Inhibiting deacetylase enzymes leads to fixation of prior developmental trajectories, demonstrating that histone modifications in juveniles can carry environmental information to adults. Finally, we provide evidence that this regulation was derived from an ancient mechanism of licensing developmental speed. Altogether, our results show that H4K5/12ac enables epigenetic regulation of developmental plasticity that can be stored and erased by acetylation and deacetylation, respectively.

Different environments can elicit distinct phenotypes from a single genotype, referred to as phenotypic plasticity1,2. Ecological and theoretical approaches over the last 50 years have formalized the evolutionary implications and significance of plasticity3,4,5,6. More recently, molecular approaches are homing in on the mechanisms that direct environmental influence7,8. In contrast, the mechanisms that provide environmental sensitivity remain unknown. To do so requires an experimentally-tractable system of plasticity that is capable of linking environmental sensitivity, development and gene regulation.

Here, we provide evidence that acetylation of histone 4 lysines 5/12 (H4K5/12ac) enables plasticity to different culture environments. Moreover, pharmacologically preventing deacetylation enforced epigenetic memory of a previous environmental experience; effectively canalizing a developmental trajectory despite changing environments. While several post-translational modifications to histone 3 have been implicated in dynamic gene regulation21,22, outside of H4K16ac, the function of specific modifications on H4 has been less clear. The role of H4K5/12ac identified here also extends beyond gene regulation to an ecologically relevant developmental decision. Finally, we found that acetylation regulates developmental rate across multiple Ecdysozoan species, which may be linked to the establishment of the Eu morph in P. pacificus. Thus, our results reveal the molecular determinants of plasticity and their potential evolutionary origin.

NU9056-treated animals had pleiotropic effects (e.g., reduced fertility, egg laying) consistent with Ppa-mbd-2 and Ppa-lys-12 mutants that are egg laying or vulva defective and are St-biased30. However, animals that were exposed to TSA appeared wild type except for the effect on mouth form. HDAC inhibitors have also been shown to affect developmental decisions in other organisms, and several are currently in use as chemotherapeutic drugs28,29,31,32. Yet, how HDAC inhibition leads to these effects remains poorly understood. Therefore, in the following we focus on TSA and the potential role of histone acetylation/deacetylation in plasticity.

HDAC inhibition also affects ant caste behavior28,52, beetle horn size29 and ocular dominance in mammals53, suggesting that acetylation may be a common mechanism of regulating developmental plasticity. Yet, identifying which specific modification(s) control plasticity has been complicated by the number of acetyllysine sites on both histone 3 and 4. The role of H4K5/12ac in mouth form was uncovered in part due to our unbiased biochemical approach and in part to the unusual specificity of TSA in P. pacificus. H4 N-terminal tail acetylation is broadly correlated with gene activation54, however, the functions of most individual acetyllysines are not well known. H4K16ac is the exception, and has been shown to be necessary for dosage compensation in flies54 and hematopoietic differentiation in mammals55. However, we did not observe a significant correlation of this mark with switch gene transcription, or with commonly studied enhancer/promoter modifications on H327. There is indirect evidence though for a role of H4K12ac in plasticity. For instance, H4K12ac has been linked to acetyl-CoA levels35, suggesting that it may connect diet or metabolism to changes in gene expression. Furthermore, stimulating H4K12ac can promote memory formation, a paradigm of neuronal plasticity37,56. While the outcomes of neuronal and morphological plasticity are clearly different, the proximate mechanisms regulating plasticity may be shared.

Our time-resolved data also support a mechanistic role for H4K5/12ac in transcriptional elongation. This has been hinted at by ChIP-seq data showing an abundance of H4K12ac in gene bodies compared to other acetylated lysines38,57. Furthermore, the bromodomain and extraterminal domain (BET) family protein BRD4, which binds to acetylated histones, was recently shown to act as an elongation factor to facilitate RNAPII clearance through chromatin58. BRD4 promotes estrogen receptor-positive breast cancer by interacting with hyperacetylated H4K1236, and the related protein BRD2 interacts specifically with H4K5/12ac in immortalized human cell lines36,59,60. It may be worth investigating whether H4K5/12ac has conserved roles in hormone-dependent processes by licensing transcription elongation at key switch genes61,62. Alternatively, TSA has also been shown to induce cell cycle arrest63, which could explain its effect on development. Untangling these mechanistic possibilities may provide insight into both fundamental developmental biology and drug design.

Finally, the confluence of developmental timing and plasticity has intriguing implications for the evolution of novel phenotypes. Regulating developmental timing, referred to as heterochrony, has been hypothesized for nearly a century to facilitate evolutionary novelty67. While ample morphological evidence supports this hypothesis, there are scant known molecular mechanisms. Our results suggest that acetylation/de-acetylation acts as a timer to progress through development, and as a lever to regulate switch gene (eud-1) expression. In Pristionchus, prolonging deacetylation could delay development and extend switch gene expression into the critical window, which would initiate the Eu morph. If sufficiently selected upon, the Eu morph would ultimately canalize, as appears to have occurred in some Pristionchus species68, potentially representing plasticity-first evolution69. Going forward, it will be important to evaluate how H4K5/12 acetylation affects both molecular and evolutionary mechanisms.

All nematode strains used in this study are available from the corresponding author Ralf J. Sommer (ralf....@tuebingen.mpg.de). All other materials (oligonucleotide primers and antibodies) used in this study were purchased from vendors. The ChIP-seq datasets generated during this study are available at the National Center for Biotechnology Information Sequence Read Archive (NCBI SRA) data base under the accession number PRJNA628502. The mass spectrometry proteomics data have been deposited to the ProteomeXchange Consortium via the PRIDE partner repository with the dataset identifier PXD018940. All microscopy images are available upon request. Source data are provided with this paper.

We would like to thank Silke Wahl for guidance on histone LC-MS/MS and loading digested peptides on C18 columns. We would like to acknowledge Hanh Witte and Bogdan Sieriebriennikov for creating and providing the eud-1 CRISPR mutant. We would also like to thank Talia L. Karasov, James Lightfoot, and Tess Renahan for critical reading of our manuscript, and all members of the Sommer and Werner Laboratories. We would also like to thank WormBase. Funding was generously provided by The Max Planck Society and the School of Biological Sciences at the University of Utah

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