Haploidisation

Haploidisation is the process of halving the chromosomal content of a cell, creating a haploid cell. Within the normal reproductive cycle, haploidisation is one of the major functional consequences of meiosis, the other being a process of chromosomal crossover that mingles the genetic content of the parental chromosomes.[1] Haploidisation commitment is a checkpoint in yeast meiosis that does not occur at 34 C in the temperature-sensitive cdc5-1 mutant strain, which follows the successful completion of premeiotic DNA replication and recombination commitment.[2]

Usually, haploidisation creates a monoploid cell from a diploid progenitor, or it can involve halving of a polyploid cell, for example to make a diploid potato plant from a tetraploid lineage of potato plants.

If haploidisation is not followed by fertilisation, the result is a haploid lineage of cells. For example, experimental haploidisation may be used to recover a strain of haploid Dictyostelium from a diploid strain.[3]

Haploidisation sometimes occurs naturally in plants when meiotically reduced cells (usually egg cells) develop by parthenogenesis.

This was one of the procedures used by Japanese researchers to produce Kaguya, a fatherless mouse.

See also

References

  1. ↑ ML Kothari, L Mehta (2002). "Bipolar hermaphroditism of somatic cell as the basis of its being and becoming: celldom appreciated.". Journal of Postgraduate Medicine.
  2. ↑ PMID 1981
  3. ↑ PMID 7227041
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