Mitochondrial "DNA analysis (HVRI sequences and RFLPs) [have been performed from] aborigine remains around 1000 years old. The sequences retrieved show that the Guanches possessed U6b1 lineages that are in the present day Canarian population, but not in Africans. In turn, U6b, the phylogenetically closest ancestor found in Africa, is not present in the Canary Islands. Comparisons with other populations relate the Guanches with the actual inhabitants of the Archipelago and with Moroccan Berbers. This shows that, despite the continuous changes suffered by the population (Spanish colonisation, slave trade), aboriginal mtDNA lineages constitute a considerable proportion of the Canarian gene pool. Although the Berbers are the most probable ancestors of the Guanches, it is deduced that important human movements have reshaped Northwest Africa after the migratory wave to the Canary Islands."
The "sublineage U6b1 is the most prevalent of the U6 subhaplogroup in the Canarian population,4 and has still not been detected in North Africa."
"This survey includes 131 teeth, corresponding to 129 different individuals, belonging to 15 archaeological sites sampled from four of the seven Canary Islands and dated around 1000 years old [image on the right]."
"The Canarian-specific U6b1 sequences are also found in high frequency (8.45%), corroborating the fact that these lineages were already present in the aboriginal population. Three additional founder haplotypes4 were also detected (260, 069 126 and 126 292 294), all of them showing equal or higher frequencies than in the present day Canarian population."
"The detection in the Guanches of the most abundant haplotype of the U6b1 branch, also found in present day islanders,4 points to a significant continuity of the aboriginal maternal gene pool."
"The [...] estimated age of the [U6b1] subgroup is around 6000 years,29 which predates the arrival of the first human settlers to the Islands.1"
Hypotheses[edit | edit source]
- To obtain index fossils in locations where exposures do not occur, corings may provide alternatives.
See also[edit | edit source]
- Genetics/Human DNA
- Geochronology/Dye 3
- Geochronology/Geomagnetic Polarity Time Scale
- Geochronology/Ice cores
- Geochronology/Ice cores/Black ice
- Geochronology/Ice cores/Brittle ice
- Geochronology/Ice cores/Clear ice
- Geochronology/Ice cores/Firns
- Geochronology/Ice cores/Sea ice
- Geochronology/Medieval Warm Period
- Geochronology/Middle Ages
- Geochronology/Optically stimulated luminescence
- Geochronology/Radiocarbon dating
- Geochronology/Tephra layers
- Geochronology/Uranium-thorium dating
References[edit | edit source]
- Nicole Maca-Meyer; Matilda Arnay; Juan Carlos Rando; Carlos Flores; Ana M González; Vicente M Cabrera; José M Larruga (February 2014). "Ancient mtDNA analysis and the origin of the Guanches". European Journal of Human Genetics 12 (2): 155-62. doi:10.1038/sj.ejhg.5201075. PMID 14508507. http://www.nature.com/ejhg/journal/v12/n2/full/5201075a.html. Retrieved 2016-01-08.