The Greeks in Italy were Doric

The Greeks in Italy were Doric and brought J2, E, G2a and probably more R1b (see above). The Romans progressively absorbed the Etruscans and Italian Greeks and mixed with them. By the time of Julius Caesar Roman citizens were probably composed of 45% of R1b, 20% of J, 15% of E, 15% of G2a and 5% of I2a.

http://vieilleeurope.wordpress.com/2011/02/06/eupedia-maciamo-y-dna-haplogroups-of-ancient-civilizations/