TABLE 1.

Summary of the transcripts initiated from IAP elements

	IAP element			Gene
Transcript	Sizea (kb)	Type	Presence in C57BL/6 genome	Name	Orientationb	Transcription start sitec	Fusion transcriptd
M63	7	Full length	No	D14Ertd500e	Reverse	−56, −251	ND
M65	2	Deleted	No	Ercc3	Reverse	−20, −264, −558	+
M68	5.3	Deleted	Yes	Kif24	Reverse	−284	ND
M73	0.43	Solitary LTR	Yes	Acly	Reverse	−8, +28	ND
M81	0.34	Solitary LTR	No	Pcaf	Reverse	−55, −185	ND
M84	4	Deleted	Yes	Suclg2	Reverse	−363	+
M103	5	Deleted	No	None	NA	−69, −173	NA
A11	0.52	Solitary LTR	No	AK008696	Reverse	−36, −65	+
A24	0.33	Solitary LTR	Yes	Cyp20a1	Reverse	−90	+
A25	7	Full length	No	ENSMUSG00000025246	Reverse	+155	ND
H8	5	Deleted	Yes	Rpo1-4	Reverse	+10, +73, −13, −223	+

^aSizes of IAP elements not present in the C57BL/6 genome database were estimated by PCR amplification of IAP elements from the 129 mouse genome.

^bOrientation of IAP elements relative to the endogenous genes. NA, not applicable because of the absence of genes at the locus under study.

^cTranscription start sites were determined by sequencing 5′RACE reaction product and the distance from the end of the IAP–LTR is shown in nucleotides. Plus numbers represent the start sites mapped outside the IAP–LTR, and minus numbers represent the start sites mapped inside the IAP–LTR.

^dND, not detected by PCR analysis; NA, not analyzed because of the absence of genes at the locus under study.