[X-linked recessive chondrodysplasia punctata. Cytogenetic study and role of molecular biology]. / Chondrodysplasie ponctuée récessive liée à l'X. Etude cytogénétique et place de la biologie moléculaire.

UNLABELLED: Among the many acquired or constitutional causes of chondrodysplasia punctata, the X-linked recessive form is well individualized. CASE REPORT: A male newborn presented a dysmorphic syndrome with a marked nasal hypoplasia, a macroglossia and a short neck. The diagnosis of chondrodysplasia punctata was made by radiography whereas the chromosomal chart revealed the existence of an additional Y fragment in Xpter, effectuating a partial disomy Yp and a monosomy Xpter. Molecular biology showed a deletion of very small size, isolated and located between the gene missing aryl sulfatase E and the microsatellite DXS 1233, sping gene MRX2 (non-specific gene of mental retardation), and making it possible to give the reassuring elements as regards the psychomotor prognosis, sometimes compromised in this disorder. CONCLUSION: In case of chondrodysplasia punctata with dysmorphy, it is important to execute a chromosomal chart in the search for a chromosomal reorganization on the X and a study in molecular biology.