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The DNA Replication Fork01:02

The DNA Replication Fork

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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
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Are renal ciliopathies (replication) stressed out?

Gisela G Slaats1, Rachel H Giles1

  • 1Department of Nephrology and Hypertension, University Medical Center Utrecht, Utrecht, The Netherlands.

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|May 5, 2015
PubMed
Summary

Juvenile kidney failure, or nephronophthisis (NPHP), may stem from DNA damage due to replication stress, not just cilia loss. This finding challenges the long-held assumption about the primary cause of NPHP.

Keywords:
DNA damagecell cycleciliacyclin-dependent kinasefibrosiskidney cystsreplication stress

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Area of Science:

  • Nephrology
  • Genetics
  • Cell Biology

Background:

  • Juvenile renal failure is frequently caused by nephronophthisis (NPHP), a genetic disorder.
  • NPHP is classified as a ciliopathy, with all known NPHP genes regulating cilia function.
  • The prevailing theory linked NPHP onset to the loss of cilia function.

Purpose of the Study:

  • To investigate the underlying mechanisms of nephronophthisis (NPHP) pathogenesis.
  • To challenge the established hypothesis that cilia loss is the sole cause of NPHP.
  • To explore the role of DNA damage and replication stress in NPHP development.

Main Methods:

  • Review of recent genetic and cellular data related to NPHP.
  • Analysis of the functional consequences of NPHP gene mutations.
  • Correlation of replication stress markers with cilia dysfunction in NPHP models (implied).

Main Results:

  • Recent data suggest DNA damage, arising from replication stress, as a potential cause of NPHP.
  • This DNA damage may occur concurrently with or precede cilia dysfunction.
  • The established link between NPHP and cilia loss may be incomplete or inaccurate.

Conclusions:

  • The pathogenesis of nephronophthisis (NPHP) may involve DNA damage and replication stress.
  • Cilia dysfunction might be a secondary effect or a parallel pathway, not the primary driver.
  • Further research is needed to elucidate the precise role of DNA damage in NPHP and guide therapeutic strategies.