RNAs are the direct products of genes, and these small RNAs can bind to other specific messenger RNA (mRNA) molecules and either increase or decrease their activity, for example by preventing an mRNA from producing a protein.
What causes stretch marks? Stretch marks are caused when the skin rapidly stretches as a result of sudden growth or weight gain. The stretching causes the middle layer of skin (dermis) to tear, allowing the deeper skin layers to show through, forming stretch marks. The dermis contains strong, inter-connected fibres that allow your skin to stretch as your body grows.
The best way to prevent stretch marks is to lose or gain weight slowly. They are a very common skin condition â some people have good genetics and some don't when it comes to skin elasticity, so you don't have to be embarrassed by them. Don't despair if you follow all the guidelines and still develop stretch marks.