Summary
A cloned human cDNA for cholinesterase (ChE) was used as a probe for in situ hybridization to spread lymphocyte chromosomes to map the structural human CHE genes to distinct chromosomal regions. The recent genetic linkage assignment of the CHE1 locus of the CHE gene to chromosome 3q was confirmed and further refined to 3q21-q26, close to the genes coding for transferrin (TF) and transferrin receptor (TFRC). The CHE1 allele localizes to a 3q region that is commonly mutated and then associated with abnormal megakaryocyte proliferation in acute myelodysplastic anomalies. In view of earlier findings that ChE inhibitors induce megakaryocytopoiesis in culture, this localization may indicate that ChEs are involved in regulating the differentiation of megakaryocytes. A second site for ChEcDNA hybridization was found on chromosome 16q11-q23, demonstrating that the CHE2 locus of the cholinesterase gene, which directs the production of the common C5 variant of serum ChE, also codes for a structural subunit of the enzyme and is localized on the same chromosome with the haptoglobin (HP) gene, both genes being found on the long arm of chromosome 16. The finding of two sites for ChEcDNA hybridization suggests that the two loci coding for human ChEs may include nonidentical sequences responsible for the biochemical differences between ChE variants.
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Soreq, H., Zamir, R., Zevin-Sonkin, D. et al. Human cholinesterase genes localized by hybridization to chromosomes 3 and 16. Hum Genet 77, 325–328 (1987). https://doi.org/10.1007/BF00291419
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DOI: https://doi.org/10.1007/BF00291419