Low-copy-number repeat sequences flank the DiGeorge/velo-cardio-facial syndrome loci at 22q11.
DiGeorge syndrome and velo-cardio-facial syndrome are associated with deletions within 22q11. In attempting to refine the shortest region of overlap for these syndromes we have employed fluorescence in situ hybridisation. The results obtained for some probes indicate the presence of low-copy-number repeat families dispersed through proximal 22q. Several primate species have been examined for the presence or absence of two sequences mapping to pter-22q11. The results suggest a relatively recent evolutionary origin for these sequences and the loss of one sequence during the course of primate evolution.
Department of Biochemistry and Molecular Genetics, St Mary's Hospital Medical School, London, UK.
S
S
Halford
E
E
Lindsay
M
M
Nayudu
A H
AH
Carey
A
A
Baldini
P J
PJ
Scambler
D000818:Animals; D002460:Cell Line; D002892:Chromosomes, Human, Pair 22; D003360:Cosmids; D004062:DiGeorge Syndrome / Q000235:genetics*; D005145:Face / Q000002:abnormalities*; D005819:Genetic Markers; D006330:Heart Defects, Congenital / Q000235:genetics*; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D010159:Palate / Q000002:abnormalities*; D011323:Primates / Q000235:genetics; D012091:Repetitive Sequences, Nucleic Acid; D013577:Syndrome
D005819:Genetic Markers