Much progress has been made recently in the migration history of the Roms based on
language data. Genetic research on the Roms, using DNA data, sheds light on the same,
by studying connections between European Roms and local populations, between
Roms in different locations, and between Roms and Asian groups. The genetic data
confirm a migration of the ancestors of the Roms out of South Asia, through southern
Persia. In most locations of settled populations in Europe, the Roms appear rather different
from the local non-Roms and from other Romani groups. The groupings used
by geneticists often differ from those used by linguists, and the density of data, too, differs
between the two disciplines. This leads to problems of different kinds in comparing
the genetic and linguistic results on migration patterns. Generally, the data point to
the same historical scenario, including the dating of linguistic and genetic splits
http://romani.humanities.manchester.ac.uk/virtuallibrary/librarydb/web/files/pdfs/385/Paper31.pdf