Tissue | Description | References |
---|---|---|
Ovarian tissues | Small, but significant proportion of aneuploid cells (trisomy 21) in ovarian tissues of normal female fetuses | [15] |
 | 15–20% of human oocytes | [19] |
Sperm | 2–10% of spermatozoa (0.1–0.2% per chromosome) | [20] |
Chorionic villi | approaching 24% (~1% of aneuploid cells per chromosome) | [13] |
Fetal human brain | approaching 30% (~1.5 of aneuploid cells per chromosome) 35% including chromosomal mosaicism confined to the fetal brain | |
Placenta | No generalized data; chromosomal mosaicism observed in ~2% of foetuses (9–11 weeks of gestation) referred to prenatal diagnosis | [21] |
Skin (adults) | 2,2% and 4,4% (in young and old individuals, respectively) | [22] |
Liver (adults) | ~3% | [23] |
Blood (adults) | 1–2% (randomly selected autosomes) and 3% (chromosome X) | [24] |
Adult human brain | 0.1–0.7% (autosomes and chromosome Y), 2% (chromosome X); tending to approach 10%, in total |