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Chimeric twins. T.S. and M.R. reexamined.
Human Heredity
|January 1, 1984
Summary
Chimeric twins showed a decrease in foreign blood cells over time. One twin had about 1/5 the cells of the other by 1982 compared to 1970.
Area of Science:
- Human genetics
- Hematology
- Chimerism
Background:
- Chimeric twins possess a mixture of genetically distinct cell populations.
- Understanding the stability and dynamics of these cell populations is crucial for medical research.
Purpose of the Study:
- To quantify the proportion of 'foreign' blood cells in each of a pair of chimeric twins over time.
- To analyze the longitudinal changes in chimerism within the twins' hematopoietic systems.
Main Methods:
- Comparative analysis of blood cell populations from chimeric twins T.S. (male) and M.R. (female).
- Repeated measurements of 'foreign' cell percentages in each twin's bloodstream across three distinct time points (1970, 1977, 1982).
Main Results:
- The percentage of M.R.'s cells in T.S. remained relatively stable between 1977 and 1982, but was significantly lower than in 1970.
- The proportion of T.S.'s cells in M.R. exhibited a slow, gradual decline from approximately 31% in 1970 to about 25% by 1982.
Conclusions:
- Chimeric twins can exhibit dynamic changes in the distribution of their distinct cell populations over years.
- The findings suggest a potential for gradual resolution or shifts in chimerism over an individual's lifespan.