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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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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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The reference genome of the human diploid cell line RPE-1.

Emilia Volpe1, Alessio Colantoni1, Luca Corda1

  • 1Giunta Laboratory of Genome Evolution, Department of Biology and Biotechnologies "Charles Darwin", University of Rome "Sapienza", Rome, Italy.

Nature Communications
|September 12, 2025
PubMed
Summary

We present RPE1v1.1, a near-complete diploid genome assembly for the RPE-1 cell line. This reference genome aids precise genetic studies by resolving complex regions like centromeres.

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Area of Science:

  • Genomics
  • Human Genetics
  • Cell Biology

Background:

  • Telomere-to-telomere (T2T) genome assemblies provide complete human genome architecture.
  • Existing T2T assemblies like CHM13 may not reflect specific experimental cell lines, limiting functional studies.
  • Reference assemblies for relevant cell lines are crucial for accurate sequencing and manipulation, especially in variable genomic regions.

Purpose of the Study:

  • To generate a high-quality, near-complete diploid genome assembly for the hTERT RPE-1 cell line.
  • To provide a reference genome for the RPE-1 cell line, supporting advanced genetic and epigenetic research.
  • To identify and characterize genomic variations within the RPE-1 cell line, including centromeric regions and structural rearrangements.

Main Methods:

  • Utilized high-coverage Pacific Biosciences and Oxford Nanopore Technologies long-read sequencing for de novo assembly.
  • Generated chromosome-level scaffolds spanning centromeres for all chromosomes.
  • Integrated high-throughput chromosome conformation capture (Hi-C) data for phasing and validation.

Main Results:

  • Developed RPE1v1.1, a near-complete diploid genome assembly of the hTERT RPE-1 cell line.
  • The assembly includes chromosome-level scaffolds covering centromeres for all chromosomes.
  • Identified haplotype-specific genomic variations, including the characteristic t(X;10) translocation and significant divergence at centromeres when compared to CHM13.

Conclusions:

  • RPE1v1.1 serves as a valuable reference-quality diploid genome assembly for the widely used RPE-1 cell line.
  • This assembly enables high-precision genetic and epigenetic studies in the RPE-1 model system.
  • The detailed genomic information supports research in complex genomic regions and cell-line specific variations.