The Citrus tristeza virus replication signal is an regulatory element

Cis-regulatory element

A cis-regulatory element or cis-element is a region of DNA or RNA that regulates the expression of genes located on that same molecule of DNA . This term is constructed from the Latin word cis, which means "on the same side as". These cis-regulatory elements are often binding sites for one or...

 involved in a viral

Virus

A virus is a small infectious agent that can replicate only inside the living cells of organisms. Viruses infect all types of organisms, from animals and plants to bacteria and archaea...

 replication signal which is highly conserved in citrus tristeza viruses. Replication signals are required for viral replication and are usually found near the 5' and 3' termini of protein coding genes

Gene

A gene is a molecular unit of heredity of a living organism. It is a name given to some stretches of DNA and RNA that code for a type of protein or for an RNA chain that has a function in the organism. Living beings depend on genes, as they specify all proteins and functional RNA chains...

. This element is predicted to form ten stem loop structures some of which are essential for functions that provide for efficient viral replication.

See also

• Cardiovirus cis-acting replication element (CRE)
  Cardiovirus cis-acting replication element (CRE)
  This family represents a Cardiovirus cis-acting replication element which is located within the region encoding the capsid protein VP2 and is required for viral replication.-See also:*Citrus tristeza virus replication signal...
  
  
• Coronavirus SL-III cis-acting replication element (CRE)
  Coronavirus SL-III cis-acting replication element (CRE)
  The coronavirus SL-III cis-acting replication element is an RNA element that regulates defective interfering RNA replication.Other RNA families identified in the coronavirus include the coronavirus 3' stem-loop II-like motif , the coronavirus frameshifting stimulation element, the coronavirus...
  
  
• Heron HBV RNA encapsidation signal epsilon
  Heron HBV RNA encapsidation signal epsilon
  The Avian HBV RNA encapsidation signal epsilon is an RNA structure that is shown to facilitate encapsidation of the pregenomic RNA required for replication. There are two main classes of encapsidation signals in avian HBV viruses - Duck hepatitis B virus and Heron hepatitis B virus like. DHBV is...