Meis1 Knockout Cell Line (TM4)

The choice depends on whether you are studying Meis1 (myeloid ecotropic viral integration site 1)'s role as a TALE-family homeodomain transcription factor or modeling its functions in hematopoietic stem cell maintenance, leukemogenesis, or restless legs syndrome. The Knockout line is the standard tool for asking whether Meis1 is required for these processes — Meis1 dimerizes with PBX family TALE transcription factors and HOX cofactors to drive transcription of HSC self-renewal programs; Meis1 is a HOXA9 cofactor in AML pathogenesis. Overexpression is useful for studying Meis1 in leukemic transformation contexts. Important consideration: Meis1 is principally functional in hematopoietic and embryonic tissue contexts — TM4 (immortalized murine Sertoli cells) is not the physiological context for canonical Meis1 functions. The EDITGENE Meis1 Knockout in TM4 is most useful for biochemistry, heterologous expression studies, and as a clean genetic background for Meis1 structure-function research. Meis1 polymorphisms are the strongest genetic risk factor for restless legs syndrome (RLS) — disease variant rescue enables genotype-function studies. Rescue with wild-type or DNA-binding-deficient Meis1 is the standard specificity control.

Primary applications: • Heterologous transcription factor studies: TALE-PBX-HOX complex assembly and DNA binding analysis in clean genetic background. • Restless legs syndrome modeling: rescue with RLS-associated MEIS1 polymorphic variants for pharmacogenomic studies. • In leukemia-relevant contexts: HOXA9-MEIS1 cooperative transformation studies in hematopoietic cell models. • Sertoli cell biology: in TM4 background, characterization of Meis1's potential roles in testis-specific gene expression. EDITGENE recommends this model for in vitro Meis1 biochemistry; physiological hematopoietic Meis1 research requires HSC or leukemic cell models.

Yes. Meis1 rescue experiments require attention to TALE-family architecture: • Construct design: use a codon-modified Meis1 sequence with a small C-terminal tag (FLAG, HA). Meis1 has N-terminal MEIS-A/MEIS-B PBX-interaction domains, TALE homeodomain (DNA binding), and C-terminal transactivation region — preserve all elements. • DNA-binding-deficient rescue: homeodomain mutations disrupt DNA binding and serve as the standard specificity control. • PBX-interaction-deficient rescue: MEIS-A domain mutations disrupt PBX dimerization, enabling separation of DNA binding from cofactor partnership. • Functional readout: rescue should restore PBX-HOX-MEIS target gene expression in heterologous contexts. TM4-specific considerations: • TM4 is an immortalized immature murine (BALB/c) Sertoli cell line — the principal continuous Sertoli cell model retaining FSH responsiveness and key Sertoli cell features. • Lentiviral transduction is supported but may require optimization; primary Sertoli cell-specific features may be reduced compared to primary cultures. • TM4 has a non-diploid karyotype with multiple marker chromosomes — characterize transgene integration sites and expression levels carefully.