treatments for diseases that are rare, complex, or novel. In the past, DR was

considered tedious, as target identication required manual selection through litera-

ture searches. Modern approaches have advanced to incorporating knowledge-based

and machine learning information into databases that can provide valuable output of

target molecules and networks and ultimately lead to the identication of a func-

tional FDA-approved drug target to reposition for the disease of interest. Some

challenges of DR include concerns regarding intellectual property and the integra-

tion of the multitudinal approaches for DR, in particular, to incorporate vast amounts

of data across various computational tools and databases with advanced expertise.

DR is being recognized to provide hopeful outcomes for neglected and orphan

diseases as well as signicant potential for the future of personalized medicine.

Overall, genomic approaches confer a more efcient and effective establishment of

drug targets for DR.

Author Contributions Authors contributed equally to the writing and preparation

of the review manuscript. S.K.L. contributed to the supervision of this manuscript.

All authors have read and agreed to the published version of the manuscript.

Funding Internal funds from Monash Malaysia and School of Science Strategic

Grant 2020.

Conicts of Interest The authors declare no conict of interest.

References

About Cystic Fibrosis (2021) CF foundation [Internet]. Available from: https://www.cff.org/What-

is-CF/About-Cystic-Fibrosis/

Alirol E, Schrumpf D, Amici Heradi J et al (2013) Nifurtimox-eornithine combination therapy for

second-stage gambiense human African trypanosomiasis: Médecins Sans Frontières experience

in the Democratic Republic of the Congo. Clin Infect Dis 56:195203

Alzheimer Disease(2021) Genetic and rare diseases information center (GARD) an NCATS

program [Internet]. Available from: https://rarediseases.info.nih.gov/diseases/10254/

alzheimer-disease

Arnone D (2005) Review of the use of topiramate for treatment of psychiatric disorders. Ann

General Psychiatry 4:5

Aronson JK (2006) Rare diseases and orphan drugs. Br J Clin Pharmacol 61:243245

Ashburn TT, Thor KB (2004) Drug repositioning: identifying and developing new uses for existing

drugs. Nat Rev Drug Discov 3:673683

Biovista (2021) Drug positioning and prioritization - home [Internet]. Available from: https://www.

biovista.com/

Boekhout AH, Beijnen JH, Schellens JHM (2011) Trastuzumab. Oncologist 16:800810.

Available from: https://onlinelibrary.wiley.com/doi/abs/10.1634/theoncologist.2010-0035

Bush WS, Moore JH (2012) Chapter 11: genome-wide association studies. PLoS Comput Biol 8:

e1002822. Available from: www.genome.gov/gwastudies

Cavalla D (2013) Predictive methods in drug repurposing: gold mine or just a bigger haystack?

Drug Discov Today 18:523532. https://doi.org/10.1016/j.drudis.2012.12.009

68

I. A. Farouk et al.