Molecular epidemiology of HTLV type I in Japan: evidence for two distinct ancestral lineages with a particular geographical distribution.

Abstract:

:Japan is one of the highest endemic areas of the world for human T cell leukemia-lymphoma virus type I (HTLV-I). To gain new insight as to the origin of this virus in Japan and especially in the southern islands of the archipelago, we investigated the long terminal repeat (LTR) of 67 newly isolated HTLV-I proviral DNAs from peripheral blood mononuclear cells of HTLV-I-infected individuals for their restriction fragment length polymorphism (RFLP). The specimens were from Japanese living in different geographical areas (Hokkaido, Honshu, Kyushu, or the Ryukyu Islands) of Japan (59 cases) or Americans of Japanese ancestry living in Hawaii (8 cases). The analysis of the results, together with data for the 19 previously published LTR sequences, demonstrated the existence of 2 subtypes of HTLV-I in Japan. The first, which we propose to name Japanese subtype (previously named subtype III), is more frequent (67 of 86: 78%) than the second, the cosmopolitan subtype (previously named subtype II) (19 of 86: 22%). In parallel, a fragment of 413 base pairs of the U3/R region (nucleotide 22 to 434) was cloned and sequenced from 10 of the new Japanese samples. The alignment of these sequences and their comparison and phylogenetic analysis with previously published LTR HTLV-I sequences, demonstrated clearly the existence of the two distinct molecular subtypes of HTLV-I in Japan, diverging in this LTR region by about 1.6%. Furthermore, the study of the geographical distribution of the 2 subtypes among the 80 samples from patients whose place of residence in Japan was known showed an uneven distribution. While the Japanese subtype was present in all parts of Japan, the cosmopolitan subtype seemed to cluster in the southern islands of the archipelago (i.e., Kyushu and the Ryukyu Islands) as well as in immigrants from those areas who had lived in Hawaii for decades. These new molecular data raise questions and suggest hypotheses, discussed here, concerning the origin and means of dissemination of these human retrovirus subtypes in Japan.

authors

Vidal AU,Gessain A,Yoshida M,Mahieux R,Nishioka K,Tekaia F,Rosen L,De Thé G

doi

10.1089/aid.1994.10.1557

subject

Has Abstract

pub_date

1994-11-01 00:00:00

pages

1557-66

issue

11

eissn

0889-2229

issn

1931-8405

journal_volume

10

pub_type

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