So far, the main driver to have been identified is a gene that produces a protein called trichohyalin TCHH , which strengthens the growing hair. The TCHH gene contains distinct variants called small nuclear polymorphisms, which are associated with different hair shapes in people across the globe. For example, in individuals of East Asian decent, variations in the gene for the receptor EDAR are associated with straight, coarse hair.
There are a handful of additional genes that have recently been identified and might play a role in regulating hair shape. Interestingly, some of these are speculated to be under epigenetic control, which means that how they are expressed can be inherited from your parents or even be affected by your environment.
So, the next time you look at your hair and wish that it were a different shape, rest assured that scientists are working on figuring out the precise mechanisms that determine your locks. Hair thinning and hair loss are common, and manufacturers offer many products to help combat these conditions. Learn about some of the best products….
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If a hair follicle is thick and round, particular amino acids, called cysteines, are less likely to gather close enough to form tight bonds, so the strand is more likely to be straight. If the follicle is flat and thinner, the cysteines are better able to bond together and pull your strands into ringlets.
Think of wrapping a present with round string versus a flat ribbon. At times of great hormonal shifts, like puberty, pregnancy and menopause, many strange things can happen to the human body. Skin texture can change, the ability to put on or lose weight might not be the same and, sometimes, hormonal changes can literally curl or straighten your hair!
Thyroxine and Triiodothyronine are hormones produced by your thyroid gland. Clinically, doctors have observed that certain hair texture and volume changes are commonly associated with thyroid abnormalities like hypothyroidism and hyperthyroidism. People with hypothyroidism might notice that the lack of sufficient hormones will lead to dry, brittle hair; while people with hyperthyroidism might notice that their hair is thinner, brittle and oily. Androgens are male sex hormones.
They are responsible for the development and maintenance of male characteristics, but androgens increase in both boys and girls during puberty. In both sexes, these hormones contribute to increased body hair and, later, balding in males.
His study looked only at individual cross sections of sheep hair fibers under a microscope. That snapshot of hair could result from curvature, but it could also have some twisting forces, confusing the results, he said. Even if those cross sections were good representations of hair strands as a whole, it doesn't mean the other theory — the one suggesting that cell numbers are the cause — is wrong. It could be that different hair on different animals is curly for different reasons.
Perhaps, they will find we got something wrong, hopefully only small things if anything, but that's science. Live Science. Leonard Mc Lane. Ask Us Anything. December Like science, tech, and DIY projects?
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