Potato Genome Determined (almost)
The Potato Genome Sequencing Consortium (PGSC) has released a draft sequence of the potato genome. The PGSC is an international coalition of scientists from academic institutions and industry in 14 countries. Their stated mission is to “elucidate the complete DNA sequence of the potato genome (850 Mbp) by the end of 2010.”
The genome of an organism is the complete set of DNA on one set of chromosomes. A genome acts like a blueprint, containing information about the structure of the organism’s genes and also about how these structures function and interact. Information from DNA tells the organism how to build cells and helps determine its traits. The potato genome consists of 12 chromosomes and has a haploid length of approximately 840 million base pairs. The PGSC draft sequence describes roughly 95% of this information and will be updated over the coming months.
Unlike humans, which are diploids, a potato plant is a polyploid. It gets two copies of chromosomes from one parent plant and another two copies from the other parent. These four sets of chromosomes interact in complex ways to create the many variety of potatoes we see in the world today.
A main objective of the PGSC project is to help improve the quality of potatoes grown as crops by pinpointing the genetics behind varying potato traits and by making it possible to create new, more viable crop varieties in a lot less time. According to the group, the potato is the world’s third most important food crop after wheat and rice. They estimate that by 2020, over 2 billion people will depend on the potato for food, feed, or income. For those supporting the PGSC’s project, enhancing the viability of potato crops is a large step toward enhancing human livelihoods.
[via Science Daily]











