Angela
Elite member
- Messages
- 21,823
- Reaction score
- 12,329
- Points
- 113
- Ethnic group
- Italian
Well here's a surprise:
See:
http://www.nature.com/articles/srep42869\
"Complete mitochondrial sequences from Mesolithic Sardinia", Alessandra Modi et al
"Little is known about the genetic prehistory of Sardinia because of the scarcity of pre-Neolithic human remains. From a genetic perspective, modern Sardinians are known as genetic outliers in Europe, showing unusually high levels of internal diversity and a close relationship to early European Neolithic farmers. However, how far this peculiar genetic structure extends and how it originated was to date impossible to test. Here we present the first and oldest complete mitochondrial sequences from Sardinia, dated back to 10,000 yBP. These two individuals, while confirming a Mesolithic occupation of the island, belong to rare mtDNA lineages, which have never been found before in Mesolithic samples and that are currently present at low frequencies not only in Sardinia, but in the whole Europe. Preliminary Approximate Bayesian Computations, restricted by biased reference samples for Mesolithic Sardinia (the two typed samples) and Neolithic Europe (limited to central and north European sequences), suggest that the first inhabitants of the island have had a small or negligible contribution to the present-day Sardinian population, which mainly derives its genetic diversity from continental migration into the island by Neolithic times."
The two most reliable samples are mtDna I3.
The last bolded comment would indicate that the "WHG" like ancestry that Sardinians carry was almost all from the farming people who settled the island.
One often talked about migration track is from southeastern France and then down to Corsica and then further into Sardinia. The ocean currents would permit that. The other, which I still think is possible, is by sea from southeastern Europe.
The site and the samples;
http://www.nature.com/articles/srep42869/figures/1
" Studies based on complete mitogenomes have previously reported haplogroup I in ancient samples from Iran (individual I674, haplogroup I1c) and Levant (individual I1679, haplogroup I), dated to 5,105 ± 35 yBP and 8,850–8,750 yBP, respectively39. It was also found in two late Neolithic individuals from Germany, both belonging to haplogroup I3a and dated to around 4,000 yBP50 but not in previous periods in Europe. Nowadays, this haplogroup is uncommon; its frequency is about 2% in modern Sardinians, 3% across Europe, and raises at maximum 6% in Northern European countries51."
I think the third sample is too unreliable to take to the bank, but for what it's worth:
"The Mesolithic CAR-H7 sample represents so far the oldest sequence belonging to haplogroup J2b. "
"The majority of the Late Pleistocene and Early Holocene sequences belongs to the U lineage, and form a quite homogeneous cluster at the bottom of the network. The two Mesolithic samples from Sardinia are highly differentiated, departing from the network through long branches, so as to indicate mutations possibly arising along thousand years of geographic (and genetic) isolation. "
I'm wondering if perhaps the I3 was a late dispersal from the east.
See:
http://www.nature.com/articles/srep42869\
"Complete mitochondrial sequences from Mesolithic Sardinia", Alessandra Modi et al
"Little is known about the genetic prehistory of Sardinia because of the scarcity of pre-Neolithic human remains. From a genetic perspective, modern Sardinians are known as genetic outliers in Europe, showing unusually high levels of internal diversity and a close relationship to early European Neolithic farmers. However, how far this peculiar genetic structure extends and how it originated was to date impossible to test. Here we present the first and oldest complete mitochondrial sequences from Sardinia, dated back to 10,000 yBP. These two individuals, while confirming a Mesolithic occupation of the island, belong to rare mtDNA lineages, which have never been found before in Mesolithic samples and that are currently present at low frequencies not only in Sardinia, but in the whole Europe. Preliminary Approximate Bayesian Computations, restricted by biased reference samples for Mesolithic Sardinia (the two typed samples) and Neolithic Europe (limited to central and north European sequences), suggest that the first inhabitants of the island have had a small or negligible contribution to the present-day Sardinian population, which mainly derives its genetic diversity from continental migration into the island by Neolithic times."
The two most reliable samples are mtDna I3.
The last bolded comment would indicate that the "WHG" like ancestry that Sardinians carry was almost all from the farming people who settled the island.
One often talked about migration track is from southeastern France and then down to Corsica and then further into Sardinia. The ocean currents would permit that. The other, which I still think is possible, is by sea from southeastern Europe.
The site and the samples;
http://www.nature.com/articles/srep42869/figures/1
" Studies based on complete mitogenomes have previously reported haplogroup I in ancient samples from Iran (individual I674, haplogroup I1c) and Levant (individual I1679, haplogroup I), dated to 5,105 ± 35 yBP and 8,850–8,750 yBP, respectively39. It was also found in two late Neolithic individuals from Germany, both belonging to haplogroup I3a and dated to around 4,000 yBP50 but not in previous periods in Europe. Nowadays, this haplogroup is uncommon; its frequency is about 2% in modern Sardinians, 3% across Europe, and raises at maximum 6% in Northern European countries51."
I think the third sample is too unreliable to take to the bank, but for what it's worth:
"The Mesolithic CAR-H7 sample represents so far the oldest sequence belonging to haplogroup J2b. "
"The majority of the Late Pleistocene and Early Holocene sequences belongs to the U lineage, and form a quite homogeneous cluster at the bottom of the network. The two Mesolithic samples from Sardinia are highly differentiated, departing from the network through long branches, so as to indicate mutations possibly arising along thousand years of geographic (and genetic) isolation. "
I'm wondering if perhaps the I3 was a late dispersal from the east.
Last edited: