BclI RFLP for the human vimentin gene

Exclusion of candidate genes from a role in cleft lip with or without cleft palate: linkage and association studies

Candidate genes and marker loci for cleft lip/palate (CL/P) were tested using linkage analyses and association studies. Eight British families with apparent autosomal dominant inheritance of non-syndromic CL/P participated in the linkage analyses while the association analyses involved 61 unrelated British white people with CL/P and 60 controls. The report of an association between RARA (17q21) and unrelated Australian persons with CL/P (p = 0.016) was not confirmed in British CL/P persons (chi 2 = 0.954, p > 0.1). There was also no evidence of linkage between RARA and the eight CL/P families (Z = -3.211, theta = 0.001). Linkage was excluded between familial CL/P and F13A1 (map position 6p24-25) with an observed maximum lod score of Z = -2.052 at theta = 0.05. No association was found between alleles at VIM (10p13) and the British CL/P subjects (chi 2 = 0.110, p > 0.5). Multipoint analysis excluded linkage between familial CL/P and the markers D1S65 and D1S58 which flank the Van der Woude syndrome locus with a maximum lod score of Z = -4.0. This suggests that the genetic defect underlying VWS is not the same as in non-syndromic CL/P. There was no evidence of linkage between CRTL1 (5q15) and the eight CL/P families (Z = -3.466, theta = 0.05).

Regional localization of polymorphic markers on chromosome 10 by physical and genetic mapping

The human vimentin gene and a random DNA segment (D10S39) were mapped to the short arm of human chromosome 10 by linkage analysis. A panel of somatic cell hybrids and monosomy cell-lines, which divide chromosome 10 into seven regions, was used to localize 10 polymorphic markers on this chromosome. The physical map locations obtained correlate well with linkage maps of chromosome 10. Two markers which have been shown to be closely linked to the gene for multiple endocrine neoplasia type 2A map distal to a translocation breakpoint in band 10q11.2.

Development of multiple endocrine neoplasia type 2A does not involve substantial deletions of chromosome 10

In MEN2A both familial and sporadic cases are known. The familial cases show a dominant pattern of inheritance. In these respects, MEN2A resembles other tumors in whose etiology so-called tumor suppressor genes play a decisive role. The MEN2A locus has been assigned to chromosome 10 by linkage studies. Analysis of tumor DNA from 42 patients shows that markers on chromosome 10 were lost in only one tumor. Thus, these results contrast with previous studies which show that tumor development is generally associated with the loss of the whole or substantial parts of the chromosome on which the putative tumor suppressor gene is located.