Name: how eukaryotic dna fits inside the nucleus
Uploaded: 2025-08-06T09:37:50.000Z
Duration: 58 s
Channel: JoVE

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Genomic DNA in Eukaryotes

- [Instructeur] Bij eukaryoten is dubbelstrengs DNA speciaal georganiseerd in een membraangebonden kern om de beperkte ruimte van de cellen te huisvesten. Op het eerste niveau van verdichting wordt het DNA strak om specifieke eiwitten gewikkeld, histonen genaamd. Een histon kern en het DNA eromheen zijn samen bekend als een nucleosoom.

De basiseenheid van DNA-verpakking. Nucleosomen zijn met elkaar verbonden door linkend DNA om te lijken op parels aan een koord. In het volgende niveau van verpakking, nucleosomen en linkend DNA spoelen om chromatine vezels te vormen.

Ten slotte extra vezelige proteïnen comprimeren het chromatine nog verder, waardoor zulke lange DNA-lengtes kunnen worden gecomprimeerd tot zulke sterk gecondenseerde eenheden, die als chromosomen worden herkend, afhankelijk van de celdelingsfase.

genomisch dna in eukaryoten

Eukaryoten hebben grote genomen vergeleken met prokaryoten. Om hun genomen in een cel te laten passen, wordt eukaryotisch DNA buitengewoon strak in de kern verpakt. Om dit te bereiken, wordt DNA strak rond eiwitten gewikkeld die histonen worden genoemd en verpakt in nucleosomen, die met elkaar zijn verbonden door linker-DNA en vervolgens in chromatinevezels zijn gewikkeld. Extra vezelachtige eiwitten compacteren het chromatine verder, dat tijdens bepaalde fasen van de celdeling herkenbaar is als chromosomen.



<h4>Het menselijk genoom gemeten in meters</h4>



De meeste cellen in het menselijk lichaam bevatten ongeveer 6 miljard basenparen DNA, verpakt in 23 paar chromosomen. Het is moeilijk voor te stellen hoeveel DNA deze getallen vertegenwoordigen, en daarom is het moeilijk te bevatten hoe dicht opeengepakt DNA moet zijn om in een cel te passen. We kunnen enig inzicht verkrijgen door het genoom in lengte uit te drukken. Als we het DNA van één diploïde cel in een rechte lijn zouden rangschikken, zou deze ongeveer twee meter lang zijn!

Merk op dat mensen geen ongewoon grote genomen hebben. Veel vissen, amfibieën en bloeiende planten hebben een veel groter genoom dan mensen. Het haploïde genoom van de Japanse bloeiende plant Paris japonica bevat bijvoorbeeld ongeveer 50 keer meer DNA dan het menselijke haploïde genoom. Deze cijfers benadrukken het verbazingwekkende werk dat histonen en andere chromatine-hermodellerende eiwitten moeten doen om DNA te verpakken.

Genomisch DNA in eukaryoten

Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the ...

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how eukaryotic dna fits inside the nucleus

Eukaryotic DNA fits inside the nucleus by packing into a highly compact form. Eukaryotes have large genomes compared with prokaryotes, so their DNA must be tightly organized to fit inside one cell.

The process starts when DNA wraps around proteins called histones. These DNA-histone units form nucleosomes, which are connected by linker DNA. The nucleosomes then coil into chromatin fibers, and additional fibrous proteins compact the chromatin even more.

This packed material is called chromatin, and it becomes recognizable as chromosomes during certain stages of cell division. In human cells, there are about 6 billion base pairs of DNA arranged into 23 pairs of chromosomes. If the DNA from one diploid cell were stretched out in a straight line, it would measure about two meters long.

Humans are not unusual in genome size. Many fish, amphibians, and flowering plants have much larger genomes than humans. The Japanese flowering plant Paris japonica has a haploid genome with about 50 times more DNA than the human haploid genome. These examples show how strongly histones and other chromatin remodeling proteins must work to package DNA.

How Eukaryotic DNA Fits Inside the Nucleus

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Most prokaryotes store their DNA in one circular chromosome inside the nucleoid, a region of cytoplasm. This chromosome is double-stranded and tightly wound, or supercoiled, so it fits efficiently inside the cell. Prokaryotes also carry smaller circular DNA pieces called plasmids. Plasmids often carry genes that give bacteria helpful traits. One important example is antibiotic resistance. Bacteria can gain these plasmids and the traits they carry, which can help them adapt to changing...

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genomic dna in eukaryotes

Eukaryotic DNA fits inside the nucleus by packing into a highly compact form. Eukaryotes have large genomes compared with prokaryotes, so their DNA must be tightly organized to fit inside one cell. The process starts when DNA wraps around proteins called histones. These DNA-histone units form nucleosomes, which are connected by linker DNA. The nucleosomes then coil into chromatin fibers, and additional fibrous proteins compact the chromatin even more. This packed material is called chromatin,...

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Interphase is the stage of the cell cycle when a eukaryotic cell grows and copies its DNA before mitosis. In a typical human cell, the full cell cycle takes about 24 hours, and interphase makes up about 95 percent of that time. It is followed by mitosis, also called M, when the cell divides. After mitosis and cytokinesis, cells enter the G1 phase, or gap 1. During G1, cells grow continuously and prepare for DNA replication. They are metabolically active and copy essential organelles and...

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Cancer develops when mutations affect genes that control cell division. Those changes can remove the normal brakes on growth and lead to uncontrolled cell proliferation. Modern science and medicine have improved how cancer is understood and treated, and some patients can now be cured. There is still no single cure for cancer because cancer is not one disease. It is a large group of many diseases. Even when two people have the same mutation in an oncogene or a tumor suppressor gene, their...

key terms and concepts

Learn how eukaryotic DNA is packed into nucleosomes, chromatin fibers, and chromosomes, and why histones are essential for fitting long DNA inside the nucleus.

How Eukaryotic DNA Fits Inside the Nucleus | JoVE K12

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How Eukaryotic DNA Fits Inside the Nucleus

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