This study investigates tissue-specific in vitro transcription from the mouse albumin promoter using nuclear extracts from rat liver, brain, and spleen. The results show that the mouse albumin promoter is only efficiently transcribed in liver extracts, while it is not active in brain or spleen extracts. The region between -170 and -55 of the albumin promoter is essential for liver-specific transcription, as its deletion reduces transcription by almost 100-fold. Insertion of this region upstream of the parotid-specific Amy-1 promoter significantly increases its transcription activity, comparable to that of the albumin promoter. The study also demonstrates that the albumin promoter's activity in liver extracts is not due to general transcriptional permissiveness but rather specific regulatory elements. Deletion mutants of the albumin promoter show a gradual loss of transcriptional activity as upstream sequences are removed, indicating the involvement of multiple transcription factors. The albumin promoter's activity in liver extracts is enhanced by upstream sequences, and this effect is independent of the orientation of the inserted sequences. The study further shows that the albumin promoter can be activated in liver extracts even when combined with other promoters, suggesting the presence of positive transcription factors in liver nuclear extracts. The results indicate that the albumin promoter's tissue-specific transcription is controlled by positive transcription factors present in liver nuclear extracts. The study also highlights the importance of specific sequences in the albumin promoter for efficient liver-specific transcription and suggests that multiple transcription elements are involved in this process. The findings provide insights into the molecular mechanisms underlying tissue-specific gene expression.This study investigates tissue-specific in vitro transcription from the mouse albumin promoter using nuclear extracts from rat liver, brain, and spleen. The results show that the mouse albumin promoter is only efficiently transcribed in liver extracts, while it is not active in brain or spleen extracts. The region between -170 and -55 of the albumin promoter is essential for liver-specific transcription, as its deletion reduces transcription by almost 100-fold. Insertion of this region upstream of the parotid-specific Amy-1 promoter significantly increases its transcription activity, comparable to that of the albumin promoter. The study also demonstrates that the albumin promoter's activity in liver extracts is not due to general transcriptional permissiveness but rather specific regulatory elements. Deletion mutants of the albumin promoter show a gradual loss of transcriptional activity as upstream sequences are removed, indicating the involvement of multiple transcription factors. The albumin promoter's activity in liver extracts is enhanced by upstream sequences, and this effect is independent of the orientation of the inserted sequences. The study further shows that the albumin promoter can be activated in liver extracts even when combined with other promoters, suggesting the presence of positive transcription factors in liver nuclear extracts. The results indicate that the albumin promoter's tissue-specific transcription is controlled by positive transcription factors present in liver nuclear extracts. The study also highlights the importance of specific sequences in the albumin promoter for efficient liver-specific transcription and suggests that multiple transcription elements are involved in this process. The findings provide insights into the molecular mechanisms underlying tissue-specific gene expression.