OCT 22, 2014 12:00 AM PDT

Nature, Nurture, Noise

WRITTEN BY: Peter Micheli
How and how much living things are affected by nature vs. nurture has been an ongoing debate for many years. But, the whole picture is not so straight forward. For example, even identical twins raised in the same household are not exactly the same. They have different fingerprints, they may have different likes and dislikes, etc. Some of the non-physical differences can be caused by subtle differences in their environments, but there is another factor at play here, random noise.

In recent years scientists have found that what goes on in cells is not regular and predictable. This is due to basic chemistry. When molecules move around they do so randomly, meaning that biochemical reactions that are based on them also have an element of randomness. So, two genetically identical cells in the same environment can behave completely differently. In an article in Quanta Magazine, Michael Elowitz, a physicist turned biologist at the California Institute of Technology said, "I had no clue how incredibly widespread and pervasive noise is within the cell. Now I see noise as a lens through which to look at all kinds of cellular behaviors."

The effects of noise can be deadly, or simply annoying. But, now scientists are discovering that noise can sometimes be helpful. "Noise can be both an obstacle for some types of cellular behaviors as well as a useful feature for others," Elowitz said. For example, some studies have shown that random fluctuations in microbial genes can cause some to go into a dormant, drug resistant state, allowing them to survive attacks by antibiotics. The HIV virus may also use noise to survive. A percentage of the pathogen becomes latent when it infects immune cells, letting it survive antiviral treatment. But, later the latent virus can become active. This is why HIV patients need to take their medications for the rest of their life.
Understanding noise can also shed light on the strange occurrence in genetics where some mutations don't affect all the individuals that carry them.

Chance plays a part in the development of parts of our body, too. Our nose, for instance, is capable of detecting thousands of different smells. This is because each of the cells in our nose randomly developed to detect just one type of odor, although scientists aren't sure exactly how this occurs.

Not all scientists agree on the importance that noise plays in biology. Ido Golding, a physicist at Baylor College of Medicine says, "I think there have been some examples, but there is danger of over-interpreting them. I would guess that 99 percent of the time, the cell is fighting unwanted fluctuations or finding ways to live with those fluctuations. Golding believes that some of the effects other scientists attribute to noise are actually due to deterministic factors they aren't yet able to measure. Though it's clear that there is some level of biochemical noise, "blaming noise every time you see differences among cells is a very dangerous thing,"
About the Author
You May Also Like
SEP 15, 2020
Cancer
Soy helps post-op treatment of bone cancer
SEP 15, 2020
Soy helps post-op treatment of bone cancer
New research published in the journal Acta Biomaterialia highlights the post-operative benefits of soy in treatment ...
SEP 21, 2020
Cell & Molecular Biology
The Hormones We Have at Birth Are Linked to Disease Throughout Life
SEP 21, 2020
The Hormones We Have at Birth Are Linked to Disease Throughout Life
New work may help explain why some autoimmune or immune-related diseases are more common in women, who are more likely t ...
OCT 13, 2020
Clinical & Molecular DX
Test for Diabetes Checks If the Liver Is Responding
OCT 13, 2020
Test for Diabetes Checks If the Liver Is Responding
Glucagon is a hormone that prevents blood glucose levels from dropping too low by stimulating the liver to convert store ...
NOV 01, 2020
Plants & Animals
Plant Hormone Auxin Helps Orient Growth of Plant Veins
NOV 01, 2020
Plant Hormone Auxin Helps Orient Growth of Plant Veins
There are veins in plants that move nutrients and other important molecules around. These veins have to be carefully org ...
NOV 17, 2020
Cell & Molecular Biology
Chronic Inflammation Lowers Levels of Aging-Linked Molecule
NOV 17, 2020
Chronic Inflammation Lowers Levels of Aging-Linked Molecule
Over the years, the molecule nicotinamide adenine dinucleotide (NAD+) has gone from being a player in some biochemical p ...
NOV 27, 2020
Genetics & Genomics
Gravity Affects Gene Expression
NOV 27, 2020
Gravity Affects Gene Expression
If people are going to explore deep space, we should learn more about the effects that such an environment would potenti ...
Loading Comments...