▁nuclear ▁gen ome ▁was ▁suggested ▁after ▁finding ▁of ▁hom olog ous ▁structure ▁to ▁the ▁mit och ond rial ▁DNA , ▁which ▁was ▁shortly ▁after ▁the ▁discovery ▁of ▁the ▁presence ▁of ▁an ▁independent ▁DNA ▁within ▁the ▁organ elles ▁in ▁ 1 9 6 7 . ▁This ▁topic ▁stayed ▁un touch ed ▁until ▁the ▁ 1 9 8 0 s . ▁Initial ▁evidence ▁that ▁DNA ▁could ▁move ▁among ▁cell ▁compart ments ▁came ▁when ▁fragments ▁of ▁ch lor op last ▁DNA ▁were ▁found ▁in ▁the ▁ma ize ▁mit och ond rial ▁gen ome ▁with ▁the ▁help ▁of ▁cross - hy brid ization , ▁between ▁ch lor op last ▁and ▁mit och ond rial ▁DNA , ▁and ▁physical ▁mapping ▁of ▁hom olog ous ▁regions . ▁After ▁this ▁initial ▁observation , ▁Ell is ▁co ined ▁the ▁name ▁" prom is cu ous ▁DNA " ▁in ▁order ▁to ▁sign ify ▁the ▁transfer ▁of ▁DNA ▁int rac ell ular ly ▁from ▁one ▁organ elle ▁to ▁the ▁other ▁and ▁is ▁the ▁presence ▁of ▁organ elle ▁DNA ▁in ▁multiple ▁cell ular ▁compart ments . ▁This ▁is ▁not ▁only ▁an ▁important ▁discovery ▁on ▁its ▁own , ▁but ▁is ▁also ▁highly ▁inform ative ▁and ▁helpful ▁for ▁understanding ▁the ▁evolution ary ▁process ▁and ▁the ▁time ▁period ▁different ▁occurrence ▁might ▁take ▁place . ▁The ▁searching ▁for ▁m t D NA ▁in ▁nuclear ▁DNA ▁continued ▁until ▁ 1 9 9 4 ▁when ▁the ▁recent ▁remarkable ▁trans position ▁of ▁ 7 . 9 ▁k b ▁of ▁a ▁typically ▁ 1 7 . 0 - kb ▁mit och ond