Recombinant vaccine

Recombinant vaccine
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• A vaccine is a biological preparation that
improves immunity to a particular disease.
(http://www.who.int/)
• Injection of a killed microbe in order to stimulate
the immune system against the microbe, thereby
preventing disease.
(http://www.medicinenet.com/)
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• The term ''vaccine'' was derived from the
Edward Jenner's 1796 use of the term ''cow
pox'' (Latin ''variolæ vaccinæ'', adapted from
the Latin ''vaccīn-us'', from ''vacca'' cow).
• He was the pioneer of using cow pox
vaccines to prevent small pox infections.
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• Live, attenuated vaccines
• Inactivated vaccine
• Subunit vaccine
• Toxoid vaccine
• Conjugated vaccine
• DNA vaccine
• Recombinant vector vaccines
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• Vaccine antigens may also be produced
by genetic engineering technology. These
products are sometimes referred to as
recombinant vaccines.
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• The FDA licensed Merck’s Recombivax HB. This
hepatitis B vaccine was the first human vaccine
produced by recombinant DNA methods in 1981.
• In 1986, research resulted in a second generation of
genetically engineered (or DNA recombinant)
hepatitis B vaccines.
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• Subunit vaccines:
These are the components of the pathogenic organisms. Subunit
vaccines include protein , peptides and DNA.
• Attenuated recombinant vaccines:
These are the genetically modified pathogenic organisms that
are made non-pathogenic and used as vaccines.
• Vector recombinant vaccines:
These are the genetically modified viral vectors that can be used
as vaccines against certain pathogens.
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• Subunit recombinant vaccine are the components (proteins,
peptides, DNA) of the pathogenic organisms.
• Advantages :
This vaccines include their purity in preparation, stability and
safe use.
• Disadvantages:
High cost factor and possible alteration in native
conformation.
Eg: Hepatitis B, HSV, BCG.neethu asokan

• Subunit vaccines can be broadly grouped into two kinds:
(i) Recombinant protein vaccines: This is based on production
of recombinant DNA which is expressed to release the specific
protein used in vaccine preparation
(ii) DNA vaccines: Here the gene encoding for immunogenic
protein is isolated and used to produce recombinant DNA
which acts as vaccine to be injected into the individual.
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• Hepatitis B is a widespread disease in man.
• It primarily affects liver causing chronic
hepatitis, cirrhosis and liver cancer.
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• The gene encoding for hepatitis B surface antigen
(HBsAg) has been identified.
• The HBsAg vaccine as a subunit vaccine, is produced
by cloning HBsAg gene in yeast cells (Sacchromyces
cerevisiae).
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• The immune response of the body is stimulated by a
DNA molecule.
• The DNA vaccine, gene encoding an antigenic protein.
• Inserted onto a plasmid and incorporated to the target
animal cell of the host.
• Antigenic proteins are developed the humoral
immunity or cellular immunity
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DNA vaccine and its mechanism
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Advantages:
• DNA vaccine are very specific in producing target protein.
• Higher immune responds.
• more stable in various temperature.
Disadvantages:
• The fact of the DNA vaccine in the host cells is not yet clear.
• There also exists a danger of cancer due to DNA vaccine
• The post translational modified gene produced the antigen
may not be the same as the native antigen.
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• Genetically engineer the organism and use them as live
vaccines.
The production of vaccine based on the two types:
• Detection or modification of the virulence genes of the
pathogenic organisms.
• Genetically manipulated non pathogenic organisms to carry
and express antigen determinates from pathogenic organisms.
Eg: Cholera, Salmonella spp, Leishmania spp
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• Cholera is an intestinal disease.
• It is an characterized by diarrhea, dehydration,
abdominal pain and fever.
• It is an caused by a vibrio cholerae.
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• The genetically engineered V. cholerae is a good
attenuated vaccine.
• Cholera vaccine is composed of phenol killed V.
cholera.
• The genetically engineered V. cholerae cells with
deleted A1 peptide DNA sequence are quite
stable. So they can not produce enterotoxin.
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Advantages:
• This type of vaccines is that the native conformation of
the immunogenic determination is preserved, hence
the immune response is substantially high.
Disadvantages:
• There are caused some side effects.
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Development of new
strain of V. cholerae
as a attenuated
recombinant vaccine.
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• Vectors can be genetically modified and employed as
vaccines against pathogens.
• Vaccinia virus is used to the vector vaccine.
• The vaccinia virus is the possibility of vaccinating
individuals against different diseases simultaneously.
• The advantage with vector vaccine is that it
stimulates B-lymphocytes and T-lymphocytes.
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• Vaccinia viruse processed to release their DNAs.
• Then genes from hepatitis B virus, herpes simplex virus
and influenza virus are inserted into vaccinia virus
genome.
• This injected to E.coli and increasing their number and
produce plasmid insertion vectors.
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• The plasmid and vaccinia virus injected into the
animal cell.
• The plasmid insertion vector incorporates its genes
into vaccinia virus genome at a place encodes for the
enzyme thymidine kinase (TK).
• This replicate the vector recombinant vaccine and
purified the vaccine to use.
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Advantages:
• Antigens that closely resemble natural antigen can be
produced.
• Stimulate the T- lymphocytes and B- lymphocytes.
Disadvantages:
• Important limitation is the unknown risk of using in humans.
• Using this, may be serious complication in immuno
suppressed individuals as AIDS patients.neethu asokan

• FanC subunit of E. coli expressed in soybeans as possible oral vaccine for
E. coli induced diarrhea in cattle, sheep and goats.
• Capripox vaccine used as vector to protect against rinderpest and peste-
des-petits ruminants.
• Human adenovirus used as vector to deliver hemagglutinin and
nucleoproteins from swine influenza virus.
• Fowlpox virus vectored vaccines for avian influenza, Newcastle disease,
avian encephalomyelitis, laryngotracheitis, and Mycoplasma gallisepitum.
• Canada licensed first DNA vaccine for infectious haemopoetic necrosis
virus in salmon.
• Canarypox-vectored feline vaccines for leukemia and feline rabies.neethu asokan

Resent recombinant vaccines
• Classical swine fever virus (CSFV) is a live
attenuated vaccine.
• Bacterial vaccines - Bacille Calmette-Gurein
(BCG), Listeria monocytogenes, salmonellae
and shigellae vaccine vectors.
• Flu vaccine for influenza viruses.
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Reference
• U. Satyanarayana – Biotechnology.
• www.who.in
• www.medicinenet.com
• www.vaccines.gov
• www.biotechnology forums.com
• www.medscape.com
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Recombinant vaccine

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