Regulatory interactions involving two hemoglobin loci of Chironomus

The 18 p-syndrome. Report of four cases

Four children, two girls and two boys, were found to have a short arm deletion of chromosome No. 18. Three of them exhibit a typical dysmorphy of the face showing retraction of the midface, broad-based, flat nose, hypertelorism, epicanthus, "carp mouth", big, protruding, and low set ears, as well as a variable number of Turner-like features, failure of growth, mental retardation, and muscular hypotonia. A newly born child, who died at 2 days of age exhibited severe brain defects of holoprosencephalic series. The clinical and cytogenetic findings are compared with the reviewed data of the 18 p deletion. The hypothesis of "gene-dosis compensation" is discussed in order to explain the variable phenotypical expression of 18 p-syndrome as there is obviously to correlation between the extent of the deficiency and the expression of malformations.

Genetics of lucilin, a storage protein from the sheep blowfly, Lucilia cuprina (Calliphoridae)

Lucilin, the main storage protein of larval fat body and hemolymph in the sheep blowfly, Lucilia cuprina, has been isolated as a series of trimers composed of subunits of 83,000 +/- 5%, daltons. Extensive electrophoretically detectable polymorphism of lucilin subunit patterns occurs in wild and laboratory populations of Lucilia; from four to nine bands are seen in any one individual. Evidence from genetic, electrophoretic, immunological, and structural studies suggests the existence of a series of 12 or more closely related structural loci (designated Luc-1 to Luc-12) which may have arisen through gene duplication. Codominant allelic variation has been found at several of these loci. Luc-1 and Luc-3, and probably the other structural loci of the series, are located on chromosome 2.