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Transcriptomic profiling also provides crucial information on mechanisms of [[drug resistance]]. Analysis of over 1000 isolates of ''[[Plasmodium falciparum]]'', a virulent parasite responsible for malaria in humans,<ref name="Rich et al">{{cite journal | vauthors = Rich SM, Leendertz FH, Xu G, LeBreton M, Djoko CF, Aminake MN, Takang EE, Diffo JL, Pike BL, Rosenthal BM, Formenty P, Boesch C, Ayala FJ, Wolfe ND | title = The origin of malignant malaria | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 106 | issue = 35 | pages = 14902–7 | date = September 2009 | pmid = 19666593 | pmc = 2720412 | doi = 10.1073/pnas.0907740106 | bibcode = 2009PNAS..10614902R | doi-access = free }}</ref> identified that upregulation of the [[unfolded protein response]] and slower progression through the early stages of the asexual intraerythrocytic [[Plasmodium falciparum#Lifecycle|developmental cycle]] were associated with [[Artemisinin#Resistance|artemisinin resistance]] in isolates from [[Southeast Asia]].<ref name="#25502316">{{cite journal | vauthors = Mok S, Ashley EA, Ferreira PE, Zhu L, Lin Z, Yeo T, Chotivanich K, Imwong M, Pukrittayakamee S, Dhorda M, Nguon C, Lim P, Amaratunga C, Suon S, Hien TT, Htut Y, Faiz MA, Onyamboko MA, Mayxay M, Newton PN, Tripura R, Woodrow CJ, Miotto O, Kwiatkowski DP, Nosten F, Day NP, Preiser PR, White NJ, Dondorp AM, Fairhurst RM, Bozdech Z | display-authors = 6 | title = Drug resistance. Population transcriptomics of human malaria parasites reveals the mechanism of artemisinin resistance | journal = Science | volume = 347 | issue = 6220 | pages = 431–5 | date = January 2015 | pmid = 25502316 | pmc = 5642863 | doi = 10.1126/science.1260403 | bibcode = 2015Sci...347..431M }}</ref>
The use of transcriptomics is also important to investigate responses in the marine environment<ref name=":0"> {{Cite journal |last=Page |first=Tessa M. |last2=Lawley |first2=Jonathan W. |date=2022 |title=The Next Generation Is Here: A Review of Transcriptomic Approaches in Marine Ecology |url=https://www.frontiersin.org/article/10.3389/fmars.2022.757921 |journal=Frontiers in Marine Science |volume=9 |doi=10.3389/fmars.2022.757921 |issn=2296-7745}}</ref>. In marine ecology, "[[Stress (biology)|stress]]" and "[[adaptation]]" have been among the most common research topics, especially related to anthropogenic stress, such as [[global change]] and [[pollution]]<ref name=":0" />. Most of the studies in this area have been done in [[Animal|animals]], although [[Invertebrate|invertebrates]] have been underrepresented<ref name=":0" />. One issue still is a deficiency in functional genetic studies, which hamper [[Gene annotation|gene annotations]], especially for non-model species, and can lead to vague conclusions on the effects of responses studied<ref name=":0" />.
=== Gene function annotation ===
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