Transcription patterns of sequences on human chromosome 21.
The polymerase chain reaction (PCR) was used to screen embryonic, fetal and adult human cDNA libraries for transcription on chromosome 21q22.1-->q22.3. Seventy-three pairs of oligonucleotide primers on chromosome 21, used previously to screen a fetal brain cDNA library, were applied to analyze 41 different cDNA libraries. Only phage eluate (and therefore no DNA isolation) was required for this sensitive screening. Sixty primer pairs were positive with at least one cDNA library, indicating that the majority of primers were derived from transcribed sequences. Even with our most complex human fetal brain cDNA library, we detected only 57% (34/60) of transcribed sequences, illustrating the need to screen multiple human cDNA libraries to determine if transcription occurred. Since only 3/73 clones were present in only one cDNA library, the vast majority of transcribed sequences are present in more than one tissue.
Kurnit
D M
DM
Howard Hughes Medical Institute, University of Michigan Medical Center, Ann Arbor, USA.
Cheng
J
J
Zhu
Y
Y
Van Keuren
M L
ML
Jiang
Y
Y
Pan
Y
Y
Whitley
K
K
Crombez
E
E
D002891:Chromosomes, Human, Pair 21; D017931:DNA Primers; D015698:Genomic Library; D006801:Humans; D016133:Polymerase Chain Reaction; D012091:Repetitive Sequences, Nucleic Acid; D014158:Transcription, Genetic
D017931:DNA Primers