Genetic and anthropometric studies on Japanese people

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In population genetics, research has been done on the genetic origins of modern Japanese people.

Overview

From the point of view of genetic studies, Japanese people:

Origins

Main articles: Jōmon people, Yayoi people, and Genetic history of East Asians § Japanese people
neo-Mongoloid face unlike the northern Jōmon.[14] Hiroto Takamiya of the Sapporo University suggested that the people of Kyushu immigrated to Okinawa between the 10th and 12th centuries CE.[15][16]

A 2011 study by Sean Lee and Toshikazu Hasegawa[17] reported that a common origin of Japonic languages had originated around 2,182 years before present.[18]

A study conducted in 2017 by

Ulsan University in Korea presented evidence that the genetic origin of Koreans is closer to that of Southeast Asians (Vietnamese people).[19] This was additionally supported by Japanese research conducted in 1999 that supported the theory that the origin of the Yayoi people was in southern China near the Yangtze river.[20]

The origins of the Jōmon and Yayoi people have often been a subject of dispute, and a recent Japanese publisher[21] has divided the potential routes of the people living on the Japanese archipelago as follows:

A population genomic PCA graph, showing the substructure of Eastern Asian populations, including analyzed Japanese Jōmon samples. Japanese people's cluster (square) is almost indistinguishable to the Korean people's cluster (circle), while the Jōmon samples are shifted towards the Siberian cluster in a more distinct position. (2019)
  • Aboriginals that have been living in Japan for more than 10,000 years. (Without geographic distinction, which means, the group of people living in islands from
    Okinawa
    may all be considered to be Aboriginals in this case.)
  • Immigrants from the northern route (北方ルート in Japanese) including the people from the
    Sakhalin Island
    .
  • Immigrants from the southern route (南方ルート in Japanese) including the people from the
    Pacific Islands, Southeast Asia, and in some context, India
    .

However, a clear consensus has not been reached.[22][23][24][25][26]

A study in 2017 estimates the Jōmon ancestry in people from Tokyo at approximately 12%.[27]

In 2018, an independent research conducted by director Kenichi Shinoda and his team at National Museum of Nature and Science was broadcast on NHK Science ZERO and it was discovered that the modern day Japanese are genetically extremely close to the modern day Koreans.[28]

A recent PCA graph illustrating the genetic affinity of the Japanese people (classified under the Japanese-Korean cluster) with other East Asians (2022)

A genome study (Takahashi et al. 2019) shows that modern Japanese (Yamato) do not have much Jōmon ancestry at all. Nuclear genome analysis of Jōmon samples and modern Japanese samples show strong differences.[29] Various studies estimate the proportion of Jōmon ancestry in Japanese people at around 9-13%, with the remainder derived from later migrations from Asia including the Yayoi people.[27][30][2]

Recent studies have revealed that Jomon people are considerably genetically different from any other population, including modern-day Japanese.

— Takahashi et al. 2019, (Adachi et al., 2011; Adachi and Nara, 2018)
Ancestry profile of Japanese genetic clusters illustrating their genetic similarities to five mainland Asian populations

A study, published in the Cambridge University Press in 2020, suggests that the Jōmon people were rather heterogeneous, and that there was also a pre-Yayoi migration during the Jōmon period, which may be linked to the arrival of the Japonic languages, meaning that Japonic is one of the Jōmon languages. This migration is suggested to have happened before 6000BC, thus before the actual Yayoi migration.[31]

The most popular theory is that the

Yangtze River Delta in ancient China.[32][page needed] According to several Japanese historians, the Yayoi and their ancestors, the Wajin, originated in the today Yunnan province in southern China.[33] Suwa Haruo[34] considered Wa-zoku (Wajin) to be part of the Baiyue (百越).[35]

Recent full genome analyses in 2020 by Boer et al. 2020 and Yang et al. 2020, reveals some further information regarding the origin of the Jōmon peoples. They were found to have largely formed from a Paleolithic Siberian population and an East Asian related population.[11][36]

According to a March 2021 study on genetic distance measurements from a large scale genetic study titled 'Genomic insights into the formation of human populations in East Asia', the modern "Japanese populations can be modelled as deriving from Korean (91%) and Jōmon (9%)."[37]

A September 2021 study published in the journal Science Advances found that the people of Japan bore genetic signatures from three ancient populations rather than just two as previously thought.[4] The study states that in addition to the previously discovered Jōmon and Yayoi strands, a new strand was hypothesized to have been introduced, most likely from the southern Korean peninsula, during the Yayoi-Kofun transition period that had strong cultural and political affinity with Korea and China.[38] The genomes of three Kofun individuals analyzed in the study document the arrival of people with "majority East Asian ancestry and their admixture with the Yayoi population" with the additional ancestry coming from migrants who were "already highly admixed" and "best represented by the Han, who have multiple ancestral components."[39]

According to the study, the genetic profile of present-day Japanese population was established by the three major ancestral components in place by the Kofun period, with the East Asian ancestry component introduced during the Kofun period accounting for nearly 70% of the present day Japanese population admixture proportion, while Yayoi component accounting for 15-20% and the remainder by the Jōmon component.

Kinki, Hokuriku and Shikoku.[40]

The aforementioned studies are further supported by recent studies in 2022 which concluded that the ancient Jōmon people were present outside of Japan,[41] but were later significantly diminished due to the influx of proto-Koreans originating from the West Liao River, arriving in both the Korean peninsula and Japanese archipelago.[42]

Anthropometry

Stephen Pheasant (1986), who taught

ergonomics at the Royal Free Hospital and the University College, London, said that Far Eastern people have proportionately shorter lower limbs than European and black African people. Pheasant said that the proportionately short lower limbs of Far Eastern people is a difference that is most characterized in Japanese people, less characterized in Korean and Chinese people, and least characterized in Vietnamese and Thai people.[43][44]

Rajvir Yadav et al. (2000) stated the sitting height to stature ratios of different populations: South Indian (0.4922), female Indian (0.4974), Eastern Indian (0.4991), Southeastern African (0.5096), Central Indian (0.5173), US (0.5202), Western Indian (0.5243), German (0.5266) and Japanese (0.5452).[45]

Hirofumi Matsumura et al. (2001) and Hideo Matsumoto et al. (2009) said that the Japanese and Vietnamese people are regarded to be a mix of Northeast Asians and Southeast Asians. However, the amount of northern genetics is higher in Japanese people compared to Vietnamese, who are closer to other Southeast Asians (Thai or Bamar people).[46][47]

Neville Moray (2005) said that, for Korean and Japanese pilots, sitting height is more than 54% of their stature, with about 46% of their stature from leg length. Moray said that, for Americans and most Europeans, sitting height is about 52% of their stature, with about 48% of their stature from leg length. Moray indicated that modifications in basic cockpit geometry are required to accommodate Japanese and Vietnamese pilots. Moray said that the Japanese have longer torsos and a higher shoulder point than the Vietnamese, but the Japanese have about similar arm lengths to the Vietnamese, so the control stick would have to be moved 8 cm closer to the pilot for the Japanese and 7 cm closer to the pilot for the Vietnamese. Moray said that, due to having shorter legs than Americans, rudder pedals must be moved closer to the pilot by 10 cm for the Japanese and 12 cm for the Vietnamese.[48]

Craniometry

According to Pietrusewsky, the group most similar to the Japanese cranial bones were the Koreans. Meanwhile, Chinese, Mongolians and Southeast Asians were distinguished from the Japanese.[49] (2010)

Ashley Montagu (1989) said that the "Mongoloid skull generally, whether Chinese or Japanese, has been rather more neotenized than the Caucasoid or European..."[50]

Ann Kumar (1998) said that Michael Pietrusewsky (1992) said that, in a craniometric study, the cranial bones of Southeast Asians (Borneo, Vietnam, Sulu, Java, and Sulawesi etc.) are closer to Japanese, in that order, than Mongolian and Chinese populations are close to Japanese. In the craniometric study, Michael Pietrusewsky (1992) said that, even though Japanese people cluster with Mongolians, Chinese and Southeast Asians in a larger Asian cluster, the cranial bones of Japanese people are more closely aligned with several mainland and island Southeast Asian samples than with Mongolians and Chinese. However, Pietrusewsky (1992) also said, more research is needed on the similarity of the cranial bones between Japanese and Southeast Asians.[51][52]

In a craniometric study, Pietrusewsky (1994) found that the Japanese series, which was a series that spanned from the Yayoi period to modern times, formed a single branch with Korea.[53] Later, Pietrusewsky (1999) found, however, that Korean and Yayoi people were very highly separated in the East Asian cluster, indicating that the connection that Japanese have with Korea would not have derived from Yayoi people.[53] However, in a follow-up study, Pietrusewsky (2010) corrected that East Asians and Southeast Asians were markedly separated from each other. He found that Koreans had the most similar cranial bones to ancient and modern Japanese including the Yayoi people and Jōmon people, followed by Taiwan and Hainan.[49] He stated that a common origin of Northeast Asians could be traced and that they began entering the Japanese archipelago at the beginning of the Yayoi period.[49]

Park Dae-kyoon et al. (2001) said that distance analysis based on thirty-nine non-metric cranial traits showed that Koreans are closer craniometrically to Kazakhs and Mongols than to the populations in China and Japan.[54]

See also

References

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