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Related Concept Videos

Heterochromatin02:38

Heterochromatin

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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A chromosomal-scale reference genome for Rosa hugonis.

Zhenlong Liang1,2, Jia Miao1,2, Hengning Deng1,2

  • 1Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu, Sichuan, 610041, China.

Scientific Data
|February 15, 2025
PubMed
Summary
This summary is machine-generated.

We present the first high-quality genome assembly for Rosa hugonis, a key species for ecological restoration. This genetic roadmap aids in understanding its adaptability and evolutionary relationships within the Rosa genus.

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Area of Science:

  • Genomics
  • Plant Science
  • Ecology

Background:

  • Rosa hugonis is a widely distributed plant species in China.
  • It shows significant adaptability, making it a candidate for ecological restoration efforts.
  • Understanding its genetic makeup is crucial for conservation and utilization.

Purpose of the Study:

  • To generate the first high-quality chromosome-level genome assembly of Rosa hugonis.
  • To provide a valuable genetic resource for studying the species' adaptability and evolutionary history.
  • To facilitate comparative genomic studies within the Rosa genus.

Main Methods:

  • Utilized high-fidelity (HiFi) sequencing reads and Hi-C technology for genome assembly.
  • Assembled the genome data onto seven pseudochromosomes.
  • Annotated protein-coding genes within the assembled genome.

Main Results:

  • Achieved a chromosome-level assembly of the Rosa hugonis genome.
  • The genome size is 337.92 Mb with a contig N50 length of 26.84 Mb.
  • Annotated 36,218 protein-coding genes.

Conclusions:

  • The high-quality Rosa hugonis genome sequence serves as a foundational genetic resource.
  • This assembly will advance research into its genetics, ecological roles, and species relationships.
  • Enables future comparative genomics within the Rosa genus, enhancing our understanding of rose evolution.