© 2002 Journal of Medical Genetics
LETTER TO JMG
Prader-Willi syndrome and a deletion/duplication within the 15q11-q13 region
Section of Medical Genetics and Molecular Medicine, Children's Mercy Hospitals and Clinic, University of Missouri-Kansas City School of Medicine, Kansas City, Missouri, USA
Correspondence to:
Correspondence to:
Dr M G Butler, William R Brown/Missouri Chair of Medical Genetics and Professor of Pediatrics, 2401 Gillham Road, Kansas City, MO 64108, USA;
mgbutler@cmh.edu
Keywords: Prader-Willi syndrome; deletion/duplication; 15q11-q13
Abbreviations: PWS, Prader-Willi syndrome
Prader-Willi syndrome (PWS) is characterised by infantile hypotonia, feeding difficulties, hypogonadism, small hands and feet, mental deficiency, obesity in early childhood, a particular facial appearance, and a paternally derived 15q11-q13 deletion (approximately 4 million bp in size) in about 70% of subjects, maternal disomy 15 (both 15s from the mother) in 25% of subjects, or an imprinting mutation in 2-5% of subjects.1–4 PWS syndrome is considered to be the most common genetic cause of marked obesity in humans.1
Two breakpoint clusters have been reported centromeric to locus ZNF127 with the most proximal breakpoint (BP1) accounting for 44% of cytogenetic deletions while 56% of deletions occur at the second proximal breakpoint (BP2).5, 6 The second breakpoint (BP2) lies between loci D15S541/S542 and D15S543 and breakpoint BP1 is proximal to D15S541/S542.5, 6 A third breakpoint (BP3) is distally located within the 15q11-q13 region and mapped telomeric to the P locus (involved in hypopigmentation) in
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