Ysiegel, we certainly do have Dor Yesharim in the USA, and the young man and woman’s numbers were compatible. LOTS is caused when a parent is a carrier. A Dor Yesharim test is only to determine compatibility vis a vis genetic disorders. It will not show if a child is potentially suffering (or will in the future) this dreaded disease. There is very little research and no cure whatsoever for the late onset condition since, B”H, Tay Sachs has virtually been eradicated with the advent of testing. There are approximately 200 cases reported yearly, worldwide.
The couple chose to end the shidduch.