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American Journal of Human Genetics logoLink to American Journal of Human Genetics
. 1993 Jun;52(6):1153–1163.

A functional marker centromere with no detectable alpha-satellite, satellite III, or CENP-B protein: activation of a latent centromere?

L E Voullaire 1, H R Slater 1, V Petrovic 1, K H Choo 1
PMCID: PMC1682274  PMID: 7684888

Abstract

We report the investigation of an unusual human supernumerary marker chromosome 10 designated "mar del(10)." This marker is present together with two other marker chromosomes in the karyotype of a boy with mild developmental delay. It has a functional centromere at a primary constriction and is mitotically stable. Fluorescence in situ hybridization (FISH) using alpha-satellite and satellite III DNA as probes failed to detect any signal at the primary constriction site. CENP-B protein could not be demonstrated, although the presence of at least some centromeric proteins was confirmed using a CREST antiserum. Consideration of these and other cytogenetic and FISH results supports a mechanism of formation of the mar del(10) chromosome involving the activation of a latent intercalary centromere at 10q25.

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