The Puzzler, on 13 February 2012 - 03:04 AM, said:
It doesn't seem quite so simple to me.
This article talks about V and it not being present in the older Basque samples, but then about genetic drift at the time of 10,000-8,000BC.
The article is basically comparing this quote:
It is found with particularly high concentrations in the Saami People of northern Scandinavia, as well as the Basque people (10.4%) [1] and somewhat higher among the isolated Pasiegos in nearby Cantabria. It also is found in particularly high concentrations (16.3%) among the Berbers of Matmata, Tunisia.[3] The highest levels are in Scandinavian and Western and North African populations. It is spread at varying low levels across Europe and smaller portions of West and Central Asia.
http://en.wikipedia....ogroup_V_(mtDNA)
mtDNA sequence variation was studied in 121 dental samples from four Basque prehistoric sites, by high-resolution RFLP analysis. The results of this study are corroborated by (1) parallel analysis of 92 bone samples, (2) the use of controls during extraction and amplification, and (3) typing by both positive and negative restriction of the linked sites that characterize each haplogroup. The absence of haplogroup V in the prehistoric samples analyzed conflicts with the hypothesis proposed by Torroni et al., in which haplogroup V is considered as an mtDNA marker for a major Paleolithic population expansion from southwestern Europe, occurring approximately 10,000-15,000 years before the present (YBP). Our samples from the Basque Country provide a valuable tool for checking the previous hypothesis, which is based on genetic data from present-day populations. In light of the available data, the most realistic scenario to explain the origin and distribution of haplogroup V suggests that the mutation defining that haplogroup (4577 NlaIII) appeared at a time when the effective population size was small enough to allow genetic drift to act-and that such drift is responsible for the heterogeneity observed in Basques, with regard to the frequency of haplogroup V (0%-20%). This is compatible with the attributed date for the origin of that mutation (10,000-15, 000 YBP), because during the postglacial period (the Mesolithic, approximately 11,000 YBP) there was a major demographic change in the Basque Country, which minimized the effect of genetic drift. This interpretation does not rely on migratory movements to explain the distribution of haplogroup V in present-day Indo-European populations.
http://www.ncbi.nlm....pubmed/10364533
Maybe genetic drift was at work elsewhere too.
This article explains the tests they did to get the results mentioned in the above paper:
This study provides a more complete characterization of the mitochondrial genome variability of the Basques, including data on the hypervariable segment HVII of the D-loop region, which remains relatively unknown. To that end, genomic DNA from 55 healthy men living in the Arratia Valley (Biscay province) and the Goiherri region (Guipúzcoa province) was examined by direct sequencing. Three-generation pedigree charts were compiled to ensure the collection from autochthonous individuals. The most notable findings emerging from the analysis of haplogroup composition are: (i) lack of U8a mitochondrial lineage, a rare subhaplogroup recently identified in Basques and proposed as a Paleolithic marker, (ii) low frequency of haplogroup V, which conflicts with results of earlier analyses describing high frequencies in southwestern Europe, and (iii) high frequency of haplogroup J, especially subhaplogroups J1c1 and J2a. The frequency of haplogroup J does not coincide with previous mtDNA studies in present-day Basques, but is congruent with frequencies found in prehistoric and historic Basque populations. In explaining divergence in haplogroup composition between modern Basque samples, we hypothesized spatial heterogeneity promoted by population fragmentation due to extreme limitation of dispersal opportunities during the Pleistocene glaciations. Similarities between extinct and extant Basque populations as for the high frequency of lineage J, as well as the abundance of this haplogroup in northern Spain endorse a shift in the focus of attention of mtDNA analysts. A refined dissection of haplogroup J might provide more solid evidence about the process of postglacial recolonization of Europe, and thus about the shaping of the European gene pool.
http://www.ncbi.nlm....pubmed/18172868
I really don't want to bog the topic down with genetics though, I think they are not as conclusive or black and white as they seem and wouldn't rely on them to disprove anything quite frankly.
Your last link effectively voids the first two, showing that:
1) U8a isn't in evidence so cannot be used to claim a paleolithic origin for the Basques.
2) A low frequency of Haplogroup V, which means it IS NOT the origin of the Basques.
3) A high frequency of J1c1 and J2a, NEITHER of which originate in Iberia.
NONE of which shows ancient Portugese as having any significant influence on the population of the Mediterranean.
There's also this from a recent article:
Quote
The first time haplogroup V was proposed as a sign of
post-glacial human recolonization of Northern Europe
from a Franco-Cantabrian refuge (Torroni et al., 1998),
V frequencies in Basques (20%) and Catalans (24%) were
found to be surprisingly high. However, this should now
be considered as due to sampling errors because when
sample sizes were increased in posterior analyses, V
frequencies in the Basque Country dropped to 12.4%
(Torroni et al., 2001) and 10.2% (Maca-Meyer et al., 2003).
In this study, haplogroup V frequencies in the Cornice
are at their peak in Cantabria (19%), dropping westwards
to 5.6% in Asturias and to 3.8% in Galicia. In the Basque
Country, haplogroup V frequencies ranged from 11.7% in
Guipuzcoa to 5.9% in the Alava province. Finally, in a
recent survey (Alvarez-Iglesias et al., 2009), V frequencies
for Catalonia were estimated at around only 3%.
Diversity values for V are significantly higher in Southern
Iberia than in the Cornice (Po0.05). Excluding
Scandinavia, the lowest diversities are found in Northern
Africa and the Iberian northeast.
The post-glacial refuge expansion of V from a Franco-
Cantabrian refugee hypothesis did not receive unanimous
acceptation. It was first questioned on the basis of a
lack of V representatives in ancient Basque samples
(Izagirre and de la Rua, 1999) and its later presence in a
historical sample from Alava (Alzualde et al., 2005), and
second, for a lack of any directional gene-flow process of
V along the proposed north-west European transects
(Simoni et al., 2000). It was suggested that perhaps the
Cantabrian area was a more probable expansion centre
than the Basque Country (Maca-Meyer et al., 2003).
However, the lower diversity values found here for this
putative area compared with Southern Iberia also
weaken this alternative. Furthermore, a recent mtDNA
study of French populations included in the hypothetical
last glacial maximum refuge stand out by their shortage
of V lineages (Dubut et al., 2004).
Using mitochondrial DNA to test the hypothesis of a European post-glacial human recolonization from the Franco-Cantabrian refuge
The recent article effectively voids the idea of a Franco-Cantabrian refuge and any significant influence of Hg V on same.
cormac
An explanation of one's position after falling for the ramblings of a Sitchin, Von Daniken, Berlitz, Bauval, Schoch, Hancock, Velikovsky and many others if it was expressed by two of my favorite characters from "The Big Bang Theory": Leonard: All right, well, let me see if I can explain your situation using physics. What would you be if you were attached to another object by an inclined plane wrapped helically around an axis? Sheldon: Screwed.