Hemolytic uremic syndrome (HUS) is a condition characterized by destruction of red blood cells, low platelet count, and kidney failure. There are two types of HUS. Typical HUS follows a diarrheal infection often caused by E. coli OH157:H7.
Perhaps you mean what dynasty reigns in Japan. Akihito is the reigning Emperor of Japan, the 125th emperor of his line according to Japan's traditional order of succession. He acceded to the Chrysanthemum Throne in 1989. If you read wikipedia, you will observe a more balanced view of China's dynasty. Currently, and namely, there are 2 dynasties in China, with PRC being the de-facto ruling dynasty, with another less powerful ROC dynasty.
According to mythology, Japan's first Emperor Jimmu was a descendant of the Sun Goddess Amaterasu and enthroned in the year 660 BC. While the myths are not considered historically accurate, it is commonly accepted that emperors have reigned over Japan for more than 1500 years, and that they have all descended from the same family.