[Soluble brain proteins in autosomal trisomy syndromes].

The authors examined the soluble proteins of the brain frontal lobes in the newborn with trisomias of the 13th, 18th, and 21st chromosomes (Down's, Patau's, and Edwards' syndromes). The examinations were carried out on autopsy material (the post-mortem period not exceeding 24 hours) by the method of disc electrophoresis in polyacrylamide gel. The brain tissue was taken from 17 newborn infants with Down's syndrome; 9 infants with Patau's syndrome; and 7 infants with Edwards' syndrome. For the control the brain of 21 newborn infants without defects of the CNS development (the death cause being analogous) was taken. In all the syndromes studied diversely directed but relatively specific shifts were revealed on the proteinograms. It was the albumin section which appeared to be the most sensitive to the chromosomal pathology: in cases of Down's and Patau's syndromes the protein content in it was reduced, whereas in cases of Edwards' syndrome it was increased. In the latter syndrome the relative amount of neuronines S-5 and S-6, and in Patau's syndrome the amount of neuronine S-6 were lowered, this lowering being statistically significantly. In all the trisomias a tendency to a diminution of the zone of the acidic neurospecific cerebral proteins was noted. This is, possibly, due to the lower level of the CNS functional activity in chromosomal pathologies.