Japanese in Tokyo, Japan [JPT]

The biomaterials currently available for this population are shown in the table below:

Population Japanese in Tokyo, Japan [JPT]
Microtiter Plates HAPMAPPT02
Individual DNA Samples 131
Individual Cell Cultures 131

Population Description

Principal Investigator for Community Engagement and Sample Collection:
Ichiro Matsuda, Health Sciences University of Hokkaido, Japan

These cell lines and DNA samples were prepared from blood samples collected in the Tokyo metropolitan area. All of the samples are from unrelated individuals.

Because it is considered culturally insensitive in Japan to inquire specifically about a person's ancestral origins, prospective donors were simply told that the general aim was to include samples from people whose grandparents were all from Japan. The samples were collected from people who came from (or whose ancestors presumably came from) many different parts of Japan. Thus, this set of samples can be viewed as generally representative of the majority population in Japan. However, it is important to include a reference to "Tokyo, Japan" when describing the source of these samples in order to identify the population with precision. The population should not be described merely as "Asian" or as "East Asian", terms that encompass many populations whose ancestors came from places other than Japan.

After the complete descriptor "Japanese in Tokyo, Japan" has been provided, it is acceptable to use the shorthand label "Japanese" or the abbreviation "JPT" in the remainder of the article or presentation. However, the full descriptor for each population should be provided before the shorthand labels are used; this will help to avoid the risks associated with over-generalization of findings.

It may be scientifically appropriate to pool data from these samples with data from other ancestrally related groups, when the data show that the groups have similar allele frequencies. If the groups all have East Asian ancestry, the designation "East Asian ancestry" (abbreviation: EAA) to describe the combined analysis panel is recommended. If only groups very closely related to the Japanese have similar allele frequencies, then another abbreviation may need to be used.

Additional guidance about how to refer to the populations can be found at Guidelines for Referring to the Populations in Publications and Presentations.

Policies and Guidelines