Exclusion of chromosome 9 helps to identify mild variants of acromesomelic dysplasia Maroteaux type
- Laurence Faivrea,
- Martine Le Merrera,
- André Megarbaneb,
- Brigitte Gilbertc,
- Geert Mortierd,
- Veronica Cusina,
- Arnold Munnicha,
- Pierre Maroteauxa,
- Valérie Cormier-Dairea
- aDépartement de Génétique, Hôpital des Enfants Malades, 149 rue de Sèvres, 75015 Paris, France, bUnité de Génétique, Université Saint Joseph, Beirut, Lebanon, cService de Pédiatrie, Hôpital Universitaire Dupuytren, Limoges, France, dDepartment of Genetics, Gent University, Gent, Belgium
- Dr Munnich
- Revised 18 May 1999
- Accepted 5 August 1999
Abstract
Acromesomelic dysplasia Maroteaux type (AMDM) is an autosomal recessive disorder belonging to the group of acromesomelic dysplasias. AMDM is characterised by severe dwarfism with shortening of the middle and distal segments of the limbs. An AMDM gene has recently been mapped to human chromosome 9p13-q12 by homozygosity mapping in four consanguineous families. Here, we show linkage of the disease gene to chromosome 9p13-q12 in four of five consanguineous AMDM families and its exclusion in a fifth family with two children affected with a mild form of the disease. This study suggests that genetic heterogeneity accounts for the variable clinical and radiological severity of AMDM.
