Dataset Information

Deciphering past human population movements in Oceania: provably optimal trees of 127 mtDNA genomes.

ABSTRACT: The settlement of the many island groups of Remote Oceania occurred relatively late in prehistory, beginning approximately 3,000 years ago when people sailed eastwards into the Pacific from Near Oceania, where evidence of human settlement dates from as early as 40,000 years ago. Archeological and linguistic analyses have suggested the settlers of Remote Oceania had ancestry in Taiwan, as descendants of a proposed Neolithic expansion that began approximately 5,500 years ago. Other researchers have suggested that the settlers were descendants of peoples from Island Southeast Asia or the existing inhabitants of Near Oceania alone. To explore patterns of maternal descent in Oceania, we have assembled and analyzed a data set of 137 mitochondrial DNA (mtDNA) genomes from Oceania, Australia, Island Southeast Asia, and Taiwan that includes 19 sequences generated for this project. Using the MinMax Squeeze Approach (MMS), we report the consensus network of 165 most parsimonious trees for the Oceanic data set, increasing by many orders of magnitude the numbers of trees for which a provable minimal solution has been found. The new mtDNA sequences highlight the limitations of partial sequencing for assigning sequences to haplogroups and dating recent divergence events. The provably optimal trees found for the entire mtDNA sequences using the MMS method provide a reliable and robust framework for the interpretation of evolutionary relationships and confirm that the female settlers of Remote Oceania descended from both the existing inhabitants of Near Oceania and more recent migrants into the region.

SUBMITTER: Pierson MJ

PROVIDER: S-EPMC2674580 | biostudies-literature | 2006 Oct

REPOSITORIES: biostudies-literature

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Deciphering past human population movements in Oceania: provably optimal trees of 127 mtDNA genomes.

Pierson Melanie J MJ Martinez-Arias Rosa R Holland Barbara R BR Gemmell Neil J NJ Hurles Matthew E ME Penny David D

Molecular biology and evolution 20060719 10

The settlement of the many island groups of Remote Oceania occurred relatively late in prehistory, beginning approximately 3,000 years ago when people sailed eastwards into the Pacific from Near Oceania, where evidence of human settlement dates from as early as 40,000 years ago. Archeological and linguistic analyses have suggested the settlers of Remote Oceania had ancestry in Taiwan, as descendants of a proposed Neolithic expansion that began approximately 5,500 years ago. Other researchers hav ...[more]

PMID: 16855009

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Project description:AIMS: Minimally invasive surgery (MIS) requires a high degree of eye-hand coordination from the surgeon. To facilitate the learning process, objective assessment systems based on analysis of the instruments' motion are being developed. To investigate the influence of performance on motion characteristics, we examined goal-oriented movements in a box trainer. In general, goal-oriented movements consist of a retracting and a seeking phase, and are, however, not performed via the shortest path length. Therefore, we hypothesized that the shortest path is not an optimal concept in MIS. METHODS: Participants were divided into three groups (experts, residents, and novices). Each participant performed a number of one-hand positioning tasks in a box trainer. Movements of the instrument were recorded with the TrEndo tracking system. The movement from point A to B was divided into two phases: A-M (retracting) and M-B (seeking). Normalized path lengths (given in %) of the two phases were compared. RESULTS: Thirty eight participants contributed. For the retracting phase, we found no significant difference between experts [median (range) %: 152 (129-178)], residents [164 (126-250)], and novices [168 (136-268)]. In the seeking phase, we find a significant difference (<0.001) between experts [180 (172-247)], residents [201 (163-287)], and novices [290 (244-469)]. Moreover, within each group, a significant difference between retracting and seeking phases was observed. CONCLUSIONS: Goal-oriented movements in MIS can be split into two phases: retracting and seeking. Novices are less effective than experts and residents in the seeking phase. Therefore, the seeking phase is characteristic of performance differences. Furthermore, the retracting phase is essential, because it improves safety by avoiding intermediate tissue contact. Therefore, the shortest path length, as presently used during the assessment of basic MIS skills, may be not a proper concept for analyzing optimal movements and, therefore, needs to be revised.

Dataset Information

Deciphering past human population movements in Oceania: provably optimal trees of 127 mtDNA genomes.

Publications

Deciphering past human population movements in Oceania: provably optimal trees of 127 mtDNA genomes.

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