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. 1984 Oct;3(10):2279–2285. doi: 10.1002/j.1460-2075.1984.tb02126.x

A gene sequence expressed only in undifferentiated EC, EK cells and testes.

A J Stacey, M J Evans
PMCID: PMC557680  PMID: 6209131

Abstract

A clone, EC1, has been isolated from a cDNA library prepared from 4-day embryoid bodies formed by suspension culture of PSMB EC cells. This clone has been used to screen a variety of RNA sources including adult tissues, embryonal carcinoma (EC), and endoderm cell lines. A 3-kb poly(A)+ RNA species was found to be present only in undifferentiated EC cells and adult mouse testes. This species was significantly reduced in testes of W/Wv mice compared with wild-type at this locus. Germ cells and their progeny are therefore implicated as the source of the RNA in testes. Hybrid-selected RNA from PSMB could be translated in vitro into a 35-kd protein, but no translatable message was evident in either PYS-2 (parietal), or PSA5-E (visceral) endoderm cell lines. DNA sequencing of the EC1 insert revealed that it is 744 bp in length, the 3' 460 bp of which are in open reading frame. Comparison with known sequences have shown no significant homology. EC1 subclones in M13 have been used to generate single-stranded probes for hybridisation to RNA in situ in tissue sections. Hybridisation of the strand complementary to RNA produces a signal limited to the central regions of embryoid bodies formed on suspension culture of embryo-derived EK cells coinciding with the presence of undifferentiated cells. Probing of a mouse genomic library and Southern blots of liver DNA with EC1 reveals that the gene is present as a single copy.

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