Laminin subunit alpha 1 gene promoter (LAMA1 promoter) (LAMA1 promoter)

The Laminin subunit alpha 1 (LAMA1) gene promoter is a regulatory DNA sequence that controls the expression of the LAMA1 gene, which encodes the alpha 1 chain of the heterotrimeric laminin-111 protein (UniProt P25391). This promoter has emerged as a significant therapeutic target for treating Congenital Muscular Dystrophy Type 1A (MDC1A), a severe neuromuscular disorder caused by mutations in the LAMA2 gene. Because LAMA1 is a structural and functional homolog of LAMA2, its artificial upregulation can functionally substitute for the missing laminin-211 protein, thereby stabilizing the basement membrane in skeletal muscle and peripheral nerves (Kemaladewi et al., 2019, Nature). Current therapeutic strategies utilize CRISPR activation (CRISPRa) systems, where a catalytically inactive Cas9 (dCas9) fused to transcriptional activators is guided to the LAMA1 promoter by specific single-guide RNAs (PubMed 31341277). This recruitment induces high levels of endogenous LAMA1 expression in postnatal tissues where the gene is typically silenced. By restoring structural integrity and signaling at the cell-matrix interface, this approach aims to prevent progressive muscle wasting and improve motor function in patients regardless of their specific LAMA2 mutation.

Other names

LAMA1 promoterLaminin alpha 1 promoterLaminin-1 promoterLAMA1 regulatory region

Targeted transcriptional activation of the endogenous LAMA1 gene to functionally compensate for the deficiency of LAMA2 protein in muscle and nerve tissues.