Immunogenic compositions against tuberculosis
Methods of preparing mutants of Mycobacterium tuberculosis with one or more disrupted genes are presented, where the disrupted genes include ctpV, rv0990c, rv0971c, and/or rv0348. Compositions containing mutants with attenuated virulence and pathogenesis, which are capable of stimulation of an immune response against tuberculosis, are described. Compositions and methods relating to immunogenic compositions, which include an attenuated M. tb strain in which the M. tb genome includes a disruption of at least one of the ctpV gene, the rv0990c gene, the rv0971c gene, and the rv0348 gene, are also provided.
1. An immunogenic composition comprising a pharmaceutically acceptable carrier and an engineered attenuated Mycobacterium tuberculosis strain whose genome comprises a knockout mutation of gene rv0348.
2. A method of stimulating an immune response comprising administering to a mammal an immunogenic composition according to claim 1 .
3. The immunogenic composition of claim 1 , wherein the knockout mutation is an insertion of a heterologous sequence into the rv0348 gene.
4. The immunogenic composition of claim 1 , wherein the knockout mutation is a deletion of a portion of the rv0348 gene.
5. The immunogenic composition of claim 4 , wherein the knockout mutation is a deletion of at least 10% of the rv0348 gene.
6. The immunogenic composition of claim 5 , wherein the knockout mutation is a deletion of at least 20% of the rv0348 gene.
7. The immunogenic composition of claim 6 , wherein the knockout mutation is a deletion of at least 30% of the rv0348 gene.
8. The immunogenic composition of claim 1 , wherein the knockout mutation is an engineered non-function copy of the wild-type rv0348 gene.
9. The immunogenic composition of claim 1 , wherein the rv0348 gene is silent.
10. The immunogenic composition of claim 1 , wherein the knockout mutation is a null-mutation and the rv0348 gene expresses a non-functional protein.
11. The immunogenic composition of claim 1 , wherein the composition additionally comprises an adjuvant.
12. The immunogenic composition of claim 11 , wherein the adjuvant is Fruend's incomplete adjuvant.