Rabbit Anti-Human SMC1A Monoclonal Antibody, clone CM-316-3H9

Chromosome missegregation leads to chromosomal instability (CIN), thought to play a role in cancer development. As cohesin functions in guaranteeing correct chromosome segregation, increasing data suggest its involvement in tumorigenesis. In a screen of a large series of early colorectal adenomas, a precocious step during colorectal tumorigenesis, we identified 11 mutations in SMC1A core cohesin subunit. In addition, we sequenced the SMC1A gene in colorectal carcinomas and we found only one mutation. Finally, the transfection of the SMC1A mutations identified in early adenomas and wild-type SMC1A gene silencing in normal human fibroblasts led to CIN. Our findings that SMC1A mutations decrease from early adenomas to colorectal cancers and that mutations lead to CIN suggest that mutant cohesin could play a pivotal role during colorectal cancer development.

Cornelia de Lange Syndrome-1 (CdLS; OMIM # 122470) is a multisystem, congenital, developmental disorder caused by heterozygous mutation in NIPBL gene on chromosome 5p13. CdLS is characterized by growth and developmental delay, facial dysmorphism, limb abnormality and other organ defects. The condition is mainly caused due to mutation in one of the cohesin ring forming genes. Among NIPBL, SMC1A and SMC3; NIPBL is mainly responsible for causing CdLS. To date molecular data for Indian CdLS patients is not available. Entire NIPBL gene has been screened in 12 children showing CdLS using MLPA in this study. The study reports entire gene deletion in one proband and partial gene deletion in the second proband. The observed deletion was in heterozygous condition in both the cases. The finding was validated by real time PCR.