Jackfruit is consumed more commonly in Europe as a vegan alternative to meat (commonly to replace spicy and barbecued meat.
The proteins in jackfruit are thought to be Bet v 1 like proteins, which means that your body mistakes them for birch pollen allergens and can cause oral allergy type symptoms to them on ingestion
I have put together some more comprehensive resources at http://www.allergyresources.co.uk/Jackfruit.php
The allergy resources page for jackfruit covers the key allergens, which allergic syndromes are linked to this allergy and other foods which are commonly cross reactive with jackfruit.
There is also regularly updated links to useful websites specifically for jackfruit allergies and the latest research papers on the topic.
If you have multiple allergies and are interested in how they are linked or want to find out more about food allergies outside the usual top 14 then you can follow me on Facebook or Twitter, where I share a food allergy card every day of the week.