Page 1 of 14 12311 ... LastLast
Results 1 to 10 of 134

Thread: Genetic history of the population of Crete Drineas et al. 2019

  1. #1
    Gold Class Member
    Posts
    2,158
    Sex
    Ethnicity
    Ashkenazi Jew
    mtDNA (M)
    K1a1b1a
    Y-DNA (P)
    Q-YP3924

    Israel Israel Jerusalem Star of David

    Genetic history of the population of Crete Drineas et al. 2019

    Thanks to member pmokeefe for sharing this on the Western Jews mega-thread, thought it deserves it's own thread:

    https://onlinelibrary.wiley.com/doi/...1111/ahg.12328

    "The medieval history of several populations often suffers from scarcity of contemporary records resulting in contradictory and sometimes biased interpretations by historians. This is the situation with the population of the island of Crete, which remained relatively undisturbed until the Middle Ages when multiple wars, invasions, and occupations by foreigners took place. Historians have considered the effects of the occupation of Crete by the Arabs (in the 9th and 10th centuries C.E.) and the Venetians (in the 13th to the 17th centuries C.E.) to the local population. To obtain insights on such effects from a genetic perspective, we studied representative samples from 17 Cretan districts using the Illumina 1 million or 2.5 million arrays and compared the Cretans to the populations of origin of the medieval conquerors and settlers. Highlights of our findings include (1) small genetic contributions from the Arab occupation to the extant Cretan population, (2) low genetic contribution of the Venetians to the extant Cretan population, and (3) evidence of a genetic relationship among the Cretans and Central, Northern, and Eastern Europeans, which could be explained by the settlement in the island of northern origin tribes during the medieval period. Our results show how the interaction between genetics and the historical record can help shed light on the historical record."

    Sample size (n):
    "
    The participants were males or females 70 years or older (range of ages 70 to 94 years) who had paternal and maternal grandparents originating from villages located in the same district of Crete... 131 individuals were included in the study and their grandparents originated from 171 villages"




    PCAs:




    "Principal component analysis (PCA) plots for the Cretan and European populations. The first two principal components are shown in all plots. (a) Cretans and European populations: there is a clear north‐to‐south cline along the first eigenvector, with the north appearing on the left side and the south on the right side of the plot. Highlighted in blue are the labels of the Greek populations of Crete and Peloponnese. The second eigenvector captures some of the east‐to‐west cline and also shows the genetic distance of the Cretans from the Armenians and the Adygei, two populations from the region of Caucasus. The Sardinians and the Basque are located outside the European cluster in the first eigenvector, while the Chuvash are outside the cluster in the second eigenvector. The Cretans are located near the rightmost part of the plot, overlapping with the Peloponnesian, the Sicilian, and the Ashkenazi populations. (b) PCA results for the Cretan and the Slavic populations. The heterogeneity of the Slavs dominates the plot. The first eigenvector captures the genetic distance between the Cretans and the Slavs. The second eigenvector shows the difference between the Slavic populations, with Russians being the most diverse population along the eigenvector. (c) PCA results for Cretans and Sicily. There is a complete overlap among many of the Sicilian and the Cretan samples. (d) PCA results for Cretans, Ashkenazi, Druze, and Palestinians. When compared by PCA to the Palestinian and the Druze, Cretans and Ashkenazi overlap and they both separate from these Near Eastern Semitic populations "



    Key points from the study:

    On similarity with Sicilians and the reference to the Greek ancestry of Sicilians:

    "Both PCA and ADMIXTURE point to the strong genetic similarities between Cretans and Southern Europeans, especially the Sicilians (Figures 4a, 4c, and S11c). This genetic relationship is also demonstrated by network analysis of the European populations (Figure S14). Sicily has also been previously placed next to Crete using phylogenetic trees and tree mix analysis (Paschou et al., 2014). These results might reflect the common genetic history of Crete and Sicily rather than gene flow between the two islands. Sicily was heavily colonized by Greeks starting in the eight century BC (Freeman, 1891; Thucydides, 1986). Dorian Greeks colonized the South and the Southeast coast of Sicily while the Ionian Greeks colonized the North and Northeast coast. Sicily continued to be Hellenized in medieval times but under the Norman domination the usage of the Greek language was discouraged and it was eventually replaced by Italian. Southern Italy was also colonized by Ionian, Achaean, and Dorian Greeks, and these colonies, together with Sicily, composed the Greek‐dominated part of Italy, which the Latin speakers called Magna Graecia (Burry, 1963; Ceserani, 2012). The PCA (Figure 4a and 4c) and ADMIXTURE (Figure S15) data show that the historic bonds between Greece (including Crete) and Sicily were not simply cultural but genetic as well. The above findings were broadly confirmed by our ChromoPainter/FineSTRUCTURE analysis (Figure S16a and S16b)."

    On the overlap with Ashkenazi Jews:

    "In the PCA of Crete vs Europe, the Cretans overlap with three populations: the Peloponneseans, the Sicilians and the Ashkenazi Jews (see Figures 4a, S17, and S18). Southern European and Mediterranean ancestry of the Ashkenazi Jews has also been demonstrated before (Atzmon et al., 2010; Behar et al., 2010; Bauchet et al., 2007; Price et al., 2008; Seldin et al., 2006; Tian et al., 2008). Furthermore, we find in both PCA and ADMIXTURE analysis, that the Ashkenazi are more similar to the Cretans than to the two Levantine Semitic populations. One possible explanation is that this relation might reveal a common Mediterranean ancestry that the Cretan and Ashkenazi populations share."

    Regarding Slavic-like admixture reaching and influencing Crete as well (although less than it did mainland Greece) and sharing of high IBD with North Eastern (read: Slavic) populations, pointing to recent admixture event:

    "An unexpected insight in the history of Crete was provided by the IBD analysis. The results showed that the Cretans share high IBD with Western (CEU), Central (German, Polish), Northern (CEU, Scandinavian), and Eastern (Ukranian, Russian) European populations. "

    On the lack of any significant Arabic or Venetian gene flow to contemporary Cretan population:

    "The genetic impact of the Andalusian and the Near Eastern Arabs seems minimal; similarly, the genetic contribution of the Venetians to Cretans is low Tables S6–S8. This might be explained by the geography of Crete, which has many poorly accessible regions, as well as its agricultural and pastoral economy, which is sustained by a large number of small villages and hamlets spread all over the island. The Arab and Venetian conquerors settled mostly in the coastal urban centers and left the rural population intact."
    Last edited by Erikl86; 06-13-2019 at 06:37 PM.
    Check out my Hidden Content
    My Y-DNA: Q-M242 -> Q-L232 -> Q-L275 -> Q-M378 -> Q-Y2016 -> Q-L245 -> Q-FGC1904 -> Q-Y2209 -> Q-Y2225 -> Q-Y2197 -> Q-Y2750 -> Q-YP1004 -> Q-YP3924;
    My mtDNA: K1a1b1a;

    My dad's mtDNA: K2a2a;

  2. The Following 42 Users Say Thank You to Erikl86 For This Useful Post:

     Agamemnon (06-13-2019),  Ajeje Brazorf (06-13-2019),  Andrewid (06-13-2019),  Ariel90 (06-13-2019),  Chatzianastasoglou (06-13-2019),  Dewsloth (06-13-2019),  DMXX (06-13-2019),  eolien (06-14-2019),  evon (06-18-2019),  Hando (06-14-2019),  Helen (06-14-2019),  Iseid0441 (06-13-2019),  J Man (06-14-2019),  Jessie (06-15-2019),  JMcB (06-19-2019),  John Doe (06-14-2019),  jonahst (06-13-2019),  Kelmendasi (06-14-2019),  Kopfjäger (06-13-2019),  mershechu (06-13-2019),  Michalis Moriopoulos (06-14-2019),  NiloSaharan (06-14-2019),  oz (06-13-2019),  parasar (06-13-2019),  peternorth (06-14-2019),  pmokeefe (06-13-2019),  Power77 (06-14-2019),  Principe (06-17-2019),  rms2 (06-13-2019),  Ruderico (06-14-2019),  Scarlet Ibis (06-19-2019),  Seabass (06-14-2019),  Sikeliot (06-13-2019),  sktibo (07-07-2019),  SonsOfHerakles (08-07-2019),  sprfls (06-19-2019),  spruithean (06-13-2019),  T101 (06-16-2019),  Targum (06-13-2019),  Tomenable (06-15-2019),  traject (06-13-2019),  VytautusofAukstaitija (06-13-2019)

  3. #2
    Gold Class Member
    Posts
    2,158
    Sex
    Ethnicity
    Ashkenazi Jew
    mtDNA (M)
    K1a1b1a
    Y-DNA (P)
    Q-YP3924

    Israel Israel Jerusalem Star of David
    Amazing study, published today (June 13th, 2019). The number of Cretans sampled for this study is enormous. Should note that the overlap between Ashkenazi Jews and Cretans have already been shown extensively with GEDmatch samples in the Western Jews mega-thread a year ago; the Slavic-like admixture reaching Crete as well was shown in Sarno et al. (2017) and has been repeatedly advocated by number of members here; the uncanny autosomal, uniparental, as well as historical tie between Sicilians and Aegean Greeks have been propagated by number of us, and has been given strong support by several studies that are going to come out soon regarding ancient Roman and Italian remains, but is yet again supported by this study.

    What a wonderful, surprising, interesting study this is !
    Check out my Hidden Content
    My Y-DNA: Q-M242 -> Q-L232 -> Q-L275 -> Q-M378 -> Q-Y2016 -> Q-L245 -> Q-FGC1904 -> Q-Y2209 -> Q-Y2225 -> Q-Y2197 -> Q-Y2750 -> Q-YP1004 -> Q-YP3924;
    My mtDNA: K1a1b1a;

    My dad's mtDNA: K2a2a;

  4. The Following 20 Users Say Thank You to Erikl86 For This Useful Post:

     Agamemnon (06-13-2019),  Andrewid (06-13-2019),  Cascio (06-13-2019),  Claudio (06-13-2019),  Hando (06-14-2019),  Jessie (06-15-2019),  JMcB (06-19-2019),  John Doe (06-14-2019),  Kopfjäger (06-13-2019),  Motka (06-14-2019),  NiloSaharan (06-14-2019),  pmokeefe (06-13-2019),  Power77 (06-14-2019),  Principe (06-17-2019),  sprfls (06-19-2019),  spruithean (06-13-2019),  Targum (06-13-2019),  Taurus (06-14-2019),  Tomenable (06-15-2019),  VytautusofAukstaitija (06-13-2019)

  5. #3
    Registered Users
    Posts
    3,439
    Sex

    Are the data available?

  6. The Following 4 Users Say Thank You to Generalissimo For This Useful Post:

     Agamemnon (06-13-2019),  Erikl86 (06-13-2019),  Power77 (06-14-2019),  Principe (06-17-2019)

  7. #4
    Gold Class Member
    Posts
    2,158
    Sex
    Ethnicity
    Ashkenazi Jew
    mtDNA (M)
    K1a1b1a
    Y-DNA (P)
    Q-YP3924

    Israel Israel Jerusalem Star of David
    Quote Originally Posted by Generalissimo View Post
    Are the data available?
    I looked all over and couldn't find any link to it. Hopefully though it will soon?
    Check out my Hidden Content
    My Y-DNA: Q-M242 -> Q-L232 -> Q-L275 -> Q-M378 -> Q-Y2016 -> Q-L245 -> Q-FGC1904 -> Q-Y2209 -> Q-Y2225 -> Q-Y2197 -> Q-Y2750 -> Q-YP1004 -> Q-YP3924;
    My mtDNA: K1a1b1a;

    My dad's mtDNA: K2a2a;

  8. The Following 4 Users Say Thank You to Erikl86 For This Useful Post:

     Agamemnon (06-13-2019),  Hando (06-14-2019),  Power77 (06-14-2019),  Principe (06-17-2019)

  9. #5
    Registered Users
    Posts
    6,583

    Did they analyze any ancient DNA from Crete in this paper?

  10. The Following 2 Users Say Thank You to parasar For This Useful Post:

     Hando (06-14-2019),  Saosis (06-19-2019)

  11. #6
    Registered Users
    Posts
    4,773
    Sex
    Location
    Australia
    Ethnicity
    Italian Alpine
    Nationality
    Australian and Italian
    mtDNA (M)
    H95a1
    Y-DNA (P)
    T1a2b- Z19945

    Australia Italy Veneto Friuli Italy Trentino Alto Adige Austria Tirol Australia Eureka
    There is an earlier paper from 2007 by laisel martinez , y haplo in the cretan highland stating 41 samples from lasithi cretan highlands being of solely venetian lines
    12 x r-u152
    Some r1a
    3 x t1a
    I do not know the haplogroups of the other snp they supplied.......see figure 2 from that paper


    My Path = ( K-M9+, TL-P326+, T-M184+, L490+, M70+, PF5664+, L131+, L446+, CTS933+, CTS3767+, CTS8862+, Z19945+, Y70078+ )

  12. The Following 2 Users Say Thank You to vettor For This Useful Post:

     Hando (06-14-2019),  Power77 (06-14-2019)

  13. #7
    Registered Users
    Posts
    3,287
    Sex
    Location
    USA
    Nationality
    American
    mtDNA (M)
    H
    Y-DNA (P)
    R1a1a

    United States of America
    As expected, Cretans and Sicilians show very close overlap (nearly complete overlap of many of the samples). Trapani is the least Cretan-like but still clearly mostly overlapping with them, but Sicily's other regions are all well within Cretan variation.

    So it looks like Peloponnesians bridge the rest of mainland Greece with Sicily/Crete, which are essentially genetic sister islands. But Crete looks genetically more diverse than Sicily, unless it's due to higher sampling.. makes it look like Sicily is a subset of Cretan genetic variation.

    My explanation for Slavic input in Crete is low level migration from mainland Greece, not ancient tribes from NE Europe.
    Last edited by Sikeliot; 06-13-2019 at 09:19 PM.

  14. The Following 13 Users Say Thank You to Sikeliot For This Useful Post:

     Agamemnon (06-13-2019),  Andrewid (06-13-2019),  Ariel90 (06-13-2019),  Claudio (06-13-2019),  Erikl86 (06-13-2019),  Hando (06-14-2019),  Jessie (06-15-2019),  JMcB (06-19-2019),  Kopfjäger (06-14-2019),  oz (06-13-2019),  palamede (06-14-2019),  Power77 (06-14-2019),  Principe (06-17-2019)

  15. #8
    Gold Class Member
    Posts
    3,938
    Sex
    Ethnicity
    Jewish & British
    mtDNA (M)
    J1c5
    Y-DNA (P)
    J1-YSC234 (Z18271+)

    Israel Israel Jerusalem United Kingdom England Scotland Isle of Man
    Quote Originally Posted by Sikeliot View Post
    My explanation for Slavic input in Crete is low level migration from mainland Greece, not ancient tribes from NE Europe.
    My thoughts exactly. The results do confirm what you've said by the past though, there undeniably is some degree of Slavic admixture in Crete.

    I was expecting some of the more Eastern Mediterranean-shifted Peloponnesians (essentially Maniots) to resemble Ashkenazi Jews more closely, but it seems that the Cretans are still more similar on average, so I was wrong about this.

    In terms of substructure, the following really reflects the linguistic situation:

    Compatible with population movements between Crete, Peloponnese, and Dodecanese are the findings of IBD analysis (Figure S5) showing high IBD sharing between Peloponnese and west Crete and similarly high between Dodecanese and east Crete. Another explanation of the east‐to‐the west gradient, supported by the Cretan mountainous geography, is isolation by distance. Future analyses might help clarify this issue.

    Quote Originally Posted by Erikl86 View Post
    Amazing study, published today (June 13th, 2019). The number of Cretans sampled for this study is enormous. Should note that the overlap between Ashkenazi Jews and Cretans have already been shown extensively with GEDmatch samples in the Western Jews mega-thread a year ago; the Slavic-like admixture reaching Crete as well was shown in Sarno et al. (2017) and has been repeatedly advocated by number of members here; the uncanny autosomal, uniparental, as well as historical tie between Sicilians and Aegean Greeks have been propagated by number of us, and has been given strong support by several studies that are going to come out soon regarding ancient Roman and Italian remains, but is yet again supported by this study.

    What a wonderful, surprising, interesting study this is !
    Considering what Sicily's Bronze Age inhabitants looked like, there is in my opinion no avoiding the fact that Greek settlement was the most important event in Sicily's (and to a larger extent Southern Italy's) demographic history at this stage. I've said this elsewhere, but we should remember that considering their elevated affinity to the Mycenaeans as well as to the samples from Empuries, the overlap with the Sicilians should primarily be interpreted as a sign of shared Greek ancestry from a time when the mainland had a genetic profile which now survives only in isolated areas (such as the Mani Peninsula) and in the Aegean.
    Last edited by Agamemnon; 06-13-2019 at 10:42 PM.
    ᾽Άλλο δέ τοι ἐρέω, σὺ δ᾽ ἐνὶ φρεσὶ βάλλεο σῇσιν:
    κρύβδην, μηδ᾽ ἀναφανδά, φίλην ἐς πατρίδα γαῖαν
    νῆα κατισχέμεναι: ἐπεὶ οὐκέτι πιστὰ γυναιξίν.


    -Αγαμέμνων; H Οδύσσεια, Ραψωδία λ

  16. The Following 15 Users Say Thank You to Agamemnon For This Useful Post:

     Andrewid (06-13-2019),  artemv (06-13-2019),  Claudio (06-14-2019),  Erikl86 (06-14-2019),  Hando (06-14-2019),  Helgenes50 (06-14-2019),  Jessie (06-15-2019),  JMcB (06-19-2019),  jonahst (06-14-2019),  Kopfjäger (06-14-2019),  peternorth (06-14-2019),  pmokeefe (06-14-2019),  Power77 (06-14-2019),  Principe (06-17-2019),  Seabass (06-14-2019)

  17. #9
    Registered Users
    Posts
    3,287
    Sex
    Location
    USA
    Nationality
    American
    mtDNA (M)
    H
    Y-DNA (P)
    R1a1a

    United States of America
    Quote Originally Posted by Agamemnon View Post
    My thoughts exactly. The results do confirm what you've said by the past though, there undeniably is some degree of Slavic admixture in Crete.
    About Maniots, I think they kind of bridge the gap between the mainland and Sicily/Crete but might be closer to the latter, just without Levantine input. I actually think Apulians might resemble Maniots closely.

    And I would suggest Slavic exists on most of the islands, with the possible exception of some Dodecanese. Interestingly this Slavic input is higher in eastern Crete. If you compare Slavic input in Aegean islands with Germanic input in Sicily it is probably roughly equal and pulls both groups northward together, but separates them into east and west.

    But if you read the study, Crete has more IBD sharing with Slavs than with Sicilians, which means that the shared DNA with Sicily is so old and that the Slavic input is recent.

    As far as Sicilian ancestry being shared with Crete, we have to remember that both islands were colonized by Greece at roughly the same time. So we shouldn't regard Sicilians as an offshoot of Cretans, but both groups having an equally valid Greek base and then other similar admixtures that arrived independently and were not Greek, such as Levantine, Slavic/Norman/etc.

  18. The Following 12 Users Say Thank You to Sikeliot For This Useful Post:

     Agamemnon (06-14-2019),  Claudio (06-14-2019),  Erikl86 (06-14-2019),  Hando (06-14-2019),  Helgenes50 (06-14-2019),  Jessie (06-15-2019),  JMcB (06-19-2019),  palamede (06-14-2019),  peternorth (06-14-2019),  pmokeefe (06-14-2019),  Power77 (06-14-2019),  Principe (06-17-2019)

  19. #10
    Registered Users
    Posts
    309
    Sex
    Ethnicity
    Slavic
    Nationality
    Serb
    Y-DNA (P)
    I2-PH908

    Serbia Montenegro Bosnia and Herzegovina Croatia Split-Dalmatia
    delete

Page 1 of 14 12311 ... LastLast

Similar Threads

  1. Replies: 92
    Last Post: 06-18-2019, 01:23 AM
  2. Replies: 1
    Last Post: 05-31-2019, 05:08 AM
  3. Replies: 84
    Last Post: 05-21-2019, 07:06 AM
  4. Stab at African population history
    By Chad Rohlfsen in forum Autosomal (auDNA)
    Replies: 120
    Last Post: 05-09-2018, 12:37 AM
  5. Replies: 2
    Last Post: 01-25-2017, 11:27 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •