Table 1.

RT variant discovery in the DDD study

	Total sites cohort-wide	Mean sites per unaffected parent	Total de novo sites
Alu	917	23.6 ± 4.2	7
LINE-1	167	2.8 ± 1.5	2
SVA	45	0.2 ± 0.5	0
Total - MEI	1129	26.6 ± 4.7	9
Processed pseudogenes (PPGs)	576	6.6 ± 1.7	2
Total – MEI + PPG	1705	33.0 ± 5.0	11

Quantification of the four different classes of retrotransposons discovered as part of this study. Rows in italic indicate totals across the classes listed above