CTCF

Transcriptional repressor CTCF also known as 11-zinc finger protein or CCCTC-binding factor is a transcription factor that in humans is encoded by the CTCF gene. CTCF is involved in many cellular processes, including transcriptional regulation, insulator activity, V(D)J recombination and regulation of chromatin architecture.

Discovery

CCCTC-Binding factor or CTCF was initially discovered as a negative regulator of the chicken c-myc gene. This protein was found to be binding to three regularly spaced repeats of the core sequence CCCTC and thus was named CCCTC binding factor.

Function

The primary role of CTCF is thought to be in regulating the 3D structure of chromatin. CTCF binds together strands of DNA, thus forming chromatin loops, and anchors DNA to cellular structures like the nuclear lamina. It also defines the boundaries between active and heterochromatic DNA.

Since the 3D structure of DNA influences the regulation of genes, CTCF's activity influences the expression of genes. CTCF is thought to be a primary part of the activity of insulators, sequences that block the interaction between enhancers and promoters. CTCF binding has also been both shown to promote and repress gene expression. It is unknown whether CTCF affects gene expression solely through its looping activity, or if it has some other, unknown, activity.

Human Genome Organisation

The Human Genome Organisation (HUGO) is an organization involved in the Human Genome Project, a project about mapping the human genome. HUGO was established in 1989 as an international organization, primarily to foster collaboration between genome scientists around the world. The HUGO Gene Nomenclature Committee (HGNC), sometimes referred to as "HUGO", is one of HUGO's most active committees and aims to assign a unique gene name and symbol to each human gene.

History

HUGO was established in late April 1988 at the first meeting dedicated to genome mapping at Cold Spring Harbor. The idea of starting the organization stemmed from a South African biologist by the name of Sydney Brenner, who is known for his significant contributions to work on the genetic code and other areas of molecular biology, as well as winning the Nobel prize in Physiology of Medicine in 2002. A Founding Council was elected at the meeting that total 42 scientists from 17 different countries. HUGO is grounded in Geneva Switzerland, and later went on to elect an additional 178 members, bringing the total up to 220.