Receiving Moto E OTA genuine updates even after rooting..

Friends...I've got few doubts regarding flashing my moto E first gen running on lollipop 5.1..I wish to root my phone...I've read on this site about flashing my phone..but few things are not clear..
1. I wish to maintain originality of android lollipop without any modifications but with root access...means I don't wish to flash my phone with ANY CFW after rooting..is this possible?
2. Is it possible to get genuine OTA updates from Motorola even after rooting my phone?
Please clear my doubts so that I can move ahead with rooting..thanking you...