Schizosaccharomyces pombe

This tiny living thing is a type of yeast.

It is shaped like a small rod. It lives in fruit like apples and grapes.

It can also be found in tea. This yeast helps make beer. It grows at its two ends. Then, it splits right down the middle. This makes two new cells. Each new cell is the same size. It is a very small helper for science.

Fission yeast is a tiny, single-celled fungus.

It is shaped like a small rod. These cells are very small. They are 3 to 4 micrometres wide. They are 7 to 14 micrometres long.

This yeast lives in many places. It can be found on fruit like apples and grapes. It is also in tea and beer. In fact, its name "pombe" is the Swahili word for beer.

Scientists love to study this yeast. It is a model organism. This means it helps us learn about life. It has a simple set of instructions called a genome.

This genome has about 4,970 genes. Many of these genes are like human genes. This helps us study human disease.

Fission yeast grows in a special way. It grows only at its tips. To make more cells, it uses fission. This is a way to split in two. The cell grows a wall in its middle. Then, it splits into two equal daughter cells.

This makes it great for studying how cells grow and divide.

Schizosaccharomyces pombe is a tiny, single-celled fungus. Many people know it as fission yeast. This organism is very important to science. It helps researchers understand how life works at a tiny level.

Scientists use it as a model organism. This means they study it to learn about bigger living things. It is a single-celled eukaryote. This means its cells have a nucleus to hold its instructions. The cells look like small rods. They are usually 3 to 4 micrometres wide. They can be 7 to 14 micrometres long.

This yeast has a very specific way of growing. It grows only at the very tips of its rod shape. To make more cells, it uses a process called fission. This is how it splits into two new parts.

First, the cell must copy its DNA. This happens during the S phase of its life cycle. Then, the cell goes through mitosis to divide its parts. Finally, it uses cytokinesis to split the cell in half. A new wall called a septum forms in the middle. This creates two daughter cells of equal size.

People have been finding this yeast for a long time. A group in a German laboratory found it in 1893. They were looking at millet beer from East Africa. The name "pombe" comes from the Swahili word for beer.

Later, Urs Leupold studied it to learn about genetics. Murdoch Mitchison also used it to study the cell cycle. Paul Nurse is a famous researcher who studied this yeast. He helped connect the study of genetics and the cell cycle. Because of this work, Nurse won the Nobel Prize in 2001.

There are many interesting facts about this yeast's biology. Its genome is about 14.1 million base pairs long. It contains about 4,970 protein-coding genes. Researchers found that 70% of its genes are similar to human genes. This helps scientists study human diseases. In 2002, a group led by the Sanger Institute mapped its entire genome. This made it the sixth model organism to have its genome fully sequenced. About 160 different natural strains have been found around the world. They come from places like Europe, Asia, and the Americas.

Fission yeast is found in many common places. You might find it on fruits like apples or grapes. It is also found in fermented tea called kombucha. Some strains come from Brazilian Cachaça or French wine.

Even though it is small, it is very useful. It works much like the cells in our own bodies. By watching how the yeast splits, we learn how our own cells grow. It is a tiny window into the secrets of life.

Schizosaccharomyces pombe is a species of unicellular eukaryote commonly known as fission yeast. It is a single-celled fungus that belongs to the division Ascomycota. This division is the largest and most diverse group of fungi in the world. Scientists use fission yeast as a model organism to study molecular and cell biology. This means they observe its simple life to understand complex biological processes. It is especially useful for studying how cells grow, divide, and respond to damage. Because it is a eukaryote, its cellular machinery is similar to that of more complex life forms.

The cell of S. pombe has a distinct rod shape. These cells typically measure 3 to 4 micrometres in diameter. They are usually between 7 and 14 micrometres in length. Unlike many other cells, they maintain this shape by growing exclusively at the cell tips. To reproduce, the yeast undergoes a process called medial fission. This means the cell splits exactly at its midpoint. This process produces two daughter cells that are equal in size. This predictable division makes it a powerful tool for researchers studying the cell cycle.

The life cycle of fission yeast involves several distinct stages. First, the cell enters the S phase, also called the Synthetic phase. During this stage, the cell performs chromosome duplication. Following this, the cell enters the M phase, or Mitotic phase. This phase includes mitosis, where chromosomes are segregated, and cytokinesis, where the cell physically divides. There are also gap phases called G1 and G2. In S. pombe, the G2 phase is particularly extended. The cell stays in G2 for a long time to ensure it has reached the correct size before it divides. The cell cycle progression is also influenced by nutrients. In poor nutrient conditions, cells grow slowly and take longer to double in size.

History shows how this yeast moved from breweries to laboratories. It was first isolated in 1893 by Paul Lindner. He found it in millet beer imported from East Africa. The species name "pombe" is the Swahili word for beer. In the 1940s, Urs Leupold isolated standard strains for research. During the 1950s, Leupold used the yeast to study genetics. At the same time, Murdoch Mitchison used it to study the cell cycle. Later, researcher Paul Nurse merged these two fields of study. His work on cell cycle regulation led to a Nobel Prize in Physiology or Medicine in 2001. He shared this honor with Lee Hartwell and Tim Hunt.

The genetic significance of S. pombe is immense. Its genome consists of approximately 14.1 million base pairs. This genome contains about 4,970 protein-coding genes and at least 450 non-coding RNAs. In 2002, a consortium led by the Sanger Institute published its full genome sequence. This made it the sixth model eukaryotic organism to be fully sequenced. Researchers have identified that 70% of its genes are orthologous to human genes. This means they are similar to genes found in humans. Because of this connection, S. pombe helps scientists study genes involved in human diseases. It is also used to study how cells respond to DNA damage and replication.

There are many different natural strains of this yeast. Approximately 160 strains have been isolated from various locations globally. These include regions in Europe, Asia, and the Americas. Many strains come from cultivated fruits like apples and grapes. They are also found in alcoholic beverages like Brazilian Cachaça. S. pombe is even present in kombucha, which is a fermented tea. While it is found in these places, scientists are still studying its exact natural ecology. Some strains can even degrade L-malic acid, an organic acid found in wine.

Comparing S. pombe to other yeasts provides deeper insight into its unique traits. It is often compared to Saccharomyces cerevisiae, known as budding yeast. These two species diverged about 300 to 600 million years ago. While they are both yeasts, they have many differences. S. pombe has only 3 chromosomes, while S. cerevisiae has 16. S. pombe is usually haploid, meaning it has one set of chromosomes. It also has nearly 5,000 introns, which are segments of DNA. This is much higher than the 250 introns found in S. cerevisiae. These differences allow scientists to choose the best organism for specific biological questions.