NDLI: Genetic Proof of Unequal Meiotic Crossovers in Reciprocal Deletion and Duplication of 17p11.2

Content Provider	PubMed Central
Author	Shaw, Christine J. Bi, Weimin Lupski, James R.
Copyright Year	2002
Abstract	A number of common contiguous gene syndromes have been shown to result from nonallelic homologous recombination (NAHR) within region-specific low-copy repeats (LCRs). The reciprocal duplications are predicted to occur at the same frequency; however, probably because of ascertainment bias and milder phenotypes, reciprocal events have been identified in only a few cases to date. We previously described seven patients with dup(17)(p11.2p11.2), the reciprocal of the Smith-Magenis syndrome (SMS) deletion, del(17)(p11.2p11.2). In >90% of patients with SMS, identical ∼3.7-Mb deletions in 17p11.2 have been identified. These deletions are flanked by large (∼200 kb), highly homologous, directly oriented LCRs (i.e., proximal and distal SMS repeats [SMS-REPs]). The third (middle) SMS-REP is inverted with respect to them and maps inside the commonly deleted genomic region. To investigate the parental origin and to determine whether the common deletion and duplication arise by unequal crossovers mediated through NAHR between the proximal and distal SMS-REPs, we analyzed the haplotypes of 14 families with SMS and six families with dup(17)(p11.2p11.2), using microsatellite markers directly flanking the SMS common deletion breakpoints. Our data indicate that reciprocal deletion and duplication of 17p11.2 result from unequal meiotic crossovers. These rearrangements occur via both interchromosomal and intrachromosomal exchange events between the proximal and distal SMS-REPs, and there appears to be no parental-origin bias associated with common SMS deletions and the reciprocal duplications.
Related Links	http://dx.doi.org/10.1086/344346
Ending Page	1081
Page Count	10
Starting Page	1072
File Format	PDF
ISSN	00029297
e-ISSN	15376605
Journal	American Journal of Human Genetics
Issue Number	5
Volume Number	71
Language	English
Publisher	The American Society of Human Genetics
Publisher Date	2002-11-01
Access Restriction	Open
Rights Holder	The American Society of Human Genetics
Subject Keyword	Genetics(clinical) Genetics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Genetics (clinical)

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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