Toxicology alumna Jessica climbs to great heights for her PhD
Name: Jessica De Loma Olson
Degrees: Master's in Toxicology (2016)
Current role: PhD student, Institute of Environmental Medicine, KI
Based: Stockholm, Sweden

What is your educational background?
I鈥檓 originally from Valencia,鈥疭pain.鈥疘鈥痳eceived a Bachelor鈥痮f Biochemistry and Bio探花精选 Sciences from the鈥疷niversity鈥痮f Valencia. The programme was very demanding, but built a strong learning foundation for my scientific career.鈥
After my bachelor's, I knew really wanted鈥痶o continue in鈥痑cademia, but鈥疘 didn鈥檛 know鈥痚xactly鈥痺hich鈥痙irection I wanted to go.鈥疶wo things鈥痺ere鈥痗lear鈥痟owever鈥-鈥1)鈥疘 wanted to go鈥痑broad鈥痑nd鈥2) I wanted an鈥痠nternational master鈥檚 degree.鈥
I chose KI for the reputation and programme,鈥痓ut the strongest skill I achieved鈥痺as the capacity to work and establish relationships across cultures.
Why did you choose KI?
The summer before my final bachelor year, I participated in鈥痠GEM, a synthetic biology competition. One of the participants from the team was headed to Sweden to attend KI. I learned then that the is one of the oldest in Europe, with a broad and complete program including lab toxicity, a human epidemiological perspective, and more. I was convinced it was something for me!鈥
Describe your experience as master's student at KI.
The most important thing I learned was to communicate in a multicultural environment. The 28 students in my class represented more than 20 different countries.鈥
I chose KI for the reputation and program,鈥痓ut the strongest skill I achieved鈥痺as the capacity to work and establish relationships across cultures 鈥 To all students, I say 鈥減ractice and master that early in your career; you cannot learn this from books!鈥濃
Another thing I learned was the importance of finding a balance between work and personal time. The KI programmes fit in study time within a given schedule.鈥疶his allows you as a student to explore other career paths and interests in parallel to your studies. Being a student at KI also exposes you to fascinating and inspiring professionals. For example, you get the chance to attend the Nobel lectures and meet scientists driven by passion and curiosity. It鈥檚 contagious!
After you graduated from KI, what was your next step?
Ha鈥痟a鈥 There's something that happens to鈥痬any of the鈥痬aster鈥檚鈥痵tudents.鈥疻hen you鈥痜irst arrive and suddenly face the cold and dark winters, you spend months comparing your own country with Sweden.鈥疶hen, after two years of experiencing a Swedish summer, everyone鈥痜alls鈥痠n love with鈥疭tockholm.鈥疭everal of my classmates during the master鈥檚 got 鈥淪tockholm鈥疭yndrome鈥 from Stockholm itself and decided to stay!鈥
Following graduation,鈥疘 wanted to continue in academia. My mind was set on an academic career, with a strong interest in teaching 鈥撯疘鈥痑m鈥痳eally passionate鈥痶o eventually pass on鈥痥nowledge鈥痶o the next generation.鈥疘 applied to PhD positions鈥痑t KI and鈥痜ound one in the same department, within鈥痑鈥痙ifferent鈥痳esearch unit than where I did my master thesis.鈥疶o my surprise, when I wrote鈥痶he motivation letter to the lab,鈥疘 learned鈥痶hey were looking for a Spanish speaker!鈥痀ou never know what skills will come in handy.鈥

What is your current role?
I am a final-year PhD student at the Institute of Environmental Medicine at KI, preparing to defend my thesis.
What is your PhD research project?
My research project meets at the intersection between molecular epidemiology and population genetics. I evaluate how indigenous human populations living in the Bolivian Andes are chronically exposed to arsenic, what effect this toxic element has at a molecular level in their bodies, and if their genetics allows these populations to eliminate arsenic better.
Native populations from the Andes have adapted genetically to eliminate arsenic more efficiently from their bodies. This means that certain genetic variants linked to a better arsenic elimination appear at higher frequencies in these populations. However, no data was available for the Bolivian Andes, whose native populations we recently showed to be highly exposed to arsenic.
Genetic adaptation of this type is the consequence of centuries living in extreme harsh environments with very strong selective pressures modeling human evolution. My PhD project involves field work in remote villages from the Andes at more than 3500 meters of elevation to recruit study participants. Then, I evaluate their arsenic exposure in the lab, measure molecular markers related to toxicity, and explore the population genetics of these鈥痯opulations.鈥

What are your future aspirations?
My main interests are communication, teaching and management. During my PhD, I realized I love鈥痬anaging and leading my own鈥痯rojects as well as鈥痶eams. I thrive with establishing personal relationships鈥痑nd鈥痬otivating people.鈥疭o, I hope鈥痶o enjoy academia for a鈥痺hile鈥痩onger, then switch鈥痶o more project leading and management.鈥疧r why not dive into science communication or marketing!鈥
What is your advice to current students?
Find your driving passion! While you are a master's student, explore the things you like. Don鈥檛 just focus on being the BEST at what you are currently doing, invest in extracurricular activities. As a scientist, you don鈥檛 just have to do science.
And don鈥檛 forget to make friends and network along the way!
Editors note:
Editor鈥檚 note: During her master鈥檚, Jessica was very active in student-driven activities. She was on the staff of Medicor, the student magazine, and was a student digital ambassador. She even joined the KI international student recruitment team on a trip to London to represent KI.
Now as a PhD student, she has written blog posts about new ways of communicating science as part of Crastina: . She was also the marketing manager for Create Squared 2020, a student-run innovation hackathon that promotes the entrepreneurial spirit among students.