tMoL: Big Cell, Little Cell

I’m writing this as a homage to one of my closest friends on the blogosphere. The every wonderful LabRat has finally ended her fraught relationship with scientific research and is throwing herself wholeheartedly into science writing. Whilst I am hugely envious, I wish her all the best and hope she will remember me when she is rich and famous. Look out for her in future publications.

By way of background; Lab Rat has always had a fixation with the simpler things in life, by which I mean bacteria.

False colour E. coli, bacterial/prokaryotic cells.

All living organisms are made up of cells individual living units which are relatively self-supporting and capable of total self-replication, although this is complicated by the intricate interactions between different cells in larger organisms. Whilst larger creatures, like humans are made up of billions of cells, the vast majority of life on Earth exists as single celled microorganisms that cannot be observed with the naked eye.

Cells fall into two main groups, larger and more complex organisms, plants, animals and fungi are called eukaryotes (that’s us humans too) and have much more intricate cellular structures. The earliest forms of life, with the simplest cells are called prokaryotes, which include bacteria.

tMoL: Genotype vs. Phenotype

It's the end of another term, time for me to move on again. I'll be going home soon to write about what's been going on, and there's a lot to say. The talks I did in schools went really well, although there's still stuff to improve on. This lab placement has been really great and I've been enjoying all the other projects I'm involved in. Next up is an unconference, SciBarCamb, which I strongly recommend to anyone reading this blog.

This is a peice I wrote for a friend of a friend, she's doing a course in genetics and was looking for clarification of the difference between genotype and phenotype, it was a bit of a rush job but hopefully it clarifies matters.

In order to live, grow and make more of themselves, cells need to have instructions. These are stored as DNA, which is mostly found in the cell nucleus. Each set of instructions is called a gene, each gene produces a particular protein. The full set of human DNA, the human genome, can make thousands of proteins and each protein performs a specific function within a cell.

Genes are specific DNA sequences (source)

 Different people have different versions of the same gene and hence of the same protein, this is what makes us genetically different. These different gene alleles have different effects within our body. As a simplified example; there is a protein which is responsible for hair colour. If it is functioning properly then you have brown hair. Some versions of the protein do not function properly so there is no colour made, this results in blonde hair. There are various other versions with intermediate effects resulting in all different hair colours. This is a slight simplification, as there are actually multiple proteins involved in hair colour, but it illustrates the principle.

SOS: Save our Science - Inside Endometriosis

I wrote this after reading the BBC article about the same paper. The work was very poorly explained, and the findings were completely mistranslated. However, this time the original paper was pretty good, although filled with statistics (Bleh!)

All women hate periods, but a small percentage have it much worse than others. They suffer from endometriosis; severe pains and poor fertility throughout their reproductive life. The illness is often passed down through families, so must be partially dependent on genes. A new study has identified where some of these genes may occur.