The author, a scientist with a Ph.D. in human genetics and Director of Operations and Study Research Coordinator at the Sorenson Molecular Genealogy Foundation, shows proper discipline in not making unfounded conclusions and in warning that much more work remains to be done. Here is one example, where a potentially exciting report from other respected scientists is put in proper perspective:
Much can still be said about haplogroup X2 in the Americas. In our paper, two sub-branches of the Native American haplogroup X2a have been classified as X2a1 with an estimated age of 9200-9400 years and as X2a2 with an estimated age of 2300-3800 years. A possible third X2a sub-branch (X2a3?) was identified among the indigenous groups of British Columbia in Canada, but there is not sufficient data at this time to confirm this hypothesis. Furthermore, we reported in this paper the discovery of a previously unidentified X2 lineage in an Ojibwa sample – which we named X2g – that has never been previously observed in Native American populations or elsewhere.
Lastly, a paper published on PLoS One in 2008 (Shlush et al.) provides important clues about the possible origin of haplogroup X: "No population or geographic region has been identified to date, in which haplogroup X and its major subhaplogroups are found at both high frequency and high diversity, which could provide a potential clue as to their geographic origin. Here we suggest that the Druze population of northern Israel may represent just such a population."
Our paper in Current Biology does not discuss (and does not dismiss) a potential ancient origin for haplogroup X in the ancient Near East, as proposed by Shlush and Reidla (and their co-authors, including important names in population genetics such as Michael Hammer, Doron Behar, Toomas Kivisild, Richard Villems, Antonio Torroni, Alessandro Achilli, etc.), but we emphasize how this haplogroup marked a separate migratory event that characterized the history of Native American populations. Apart from anyone who believes haplogroup X to be the ultimate proof marking the arrival of Lehi’s group to the Americas (something that neither Woodward, nor myself advocate), the bottom line is that there is still much to research about the origin and dispersal of this and the other pre-Columbian lineages.