Two cases of misinterpretation of molecular results in incontinentia pligmenti, and a PCR-based method to discriminate NEMO/IKKγ gene deletion

被引:52
作者
Bardaro, T
Falco, G
Sparago, A
Mercadente, V
Molins, EG
Tarantino, E
Ursini, MV
D'Urso, M
机构
[1] Adriano BuzzatiTraverso CNR, Inst Genet & Biophys, I-80125 Naples, Italy
[2] Hosp San Juan Dios, Barcelona, Spain
[3] Clin Pediat 1, Serv Genet Med, Pisa, Italy
关键词
NEMO; IKBKG; IKK gamma; NF-kappa B essential modulator; incontinentia pigmenti; IP; X-inactivation; molecular diagnosis;
D O I
10.1002/humu.10150
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Familial incontinentia pigmenti (IP) is a rare X-linked dominant disorder that affects ectodermal tissues. Over 90% of IP carrier females have a recurrent genomic deletion of exons 4-10 of the NEMO (IKBKG-IKKgamma) gene, which encodes a regulatory component of the IkB kinase complex, required to activate the NF-kB pathway. In IP, mutations in NEMO lead to the complete loss of NF-kB activation creating a susceptibility to cellular apoptosis in response to TNF-alpha. This condition is lethal for males during embryogenesis while females, who are mosaic as a result of X-inactivation, can survive. Recently, a second nonfunctional copy of the gene, DeltaNEMO, was identified, opposite in direction to NEMO in a 35.5-kb duplicated sequence tract. PCR-based detection of the NEMO deletion is diagnostic for IP disease. However, we present instances in which ex 4-10 DeltaNEMO pseudogene deletion occurs in unaffected parents of two females with clinically characteristic IP These were missed by the currently standard PCR- based method, but can be easily discriminated by a new PCR-based test reported here that permits unambiguous molecular diagnosis and proper familial genetic counseling for IP.
引用
收藏
页码:8 / 11
页数:4
相关论文
共 8 条
[1]   A recurrent deletion in the ubiquitously expressed NEMO (IKK-γ) gene accounts for the vast majority of incontinentia pigmenti mutations [J].
Aradhya, S ;
Woffendin, H ;
Jakins, T ;
Bardaro, T ;
Esposito, T ;
Smahi, A ;
Shaw, C ;
Levy, M ;
Munnich, A ;
D'Urso, M ;
Lewis, RA ;
Kenwrick, S ;
Nelson, DL .
HUMAN MOLECULAR GENETICS, 2001, 10 (19) :2171-2179
[2]   Multiple pathogenic and benign genomic rearrangements occur at a 35 kb duplication involving the NEMO and LAGE2 genes [J].
Aradhya, S ;
Bardaro, T ;
Galgóczy, P ;
Yamagata, T ;
Esposito, T ;
Patlan, H ;
Ciccodicola, A ;
Munnich, A ;
Kenwrick, S ;
Platzer, M ;
D'Urso, M ;
Nelson, DL .
HUMAN MOLECULAR GENETICS, 2001, 10 (22) :2557-2567
[3]   INVERSION OF THE IDS GENE RESULTING FROM RECOMBINATION WITH IDS-RELATED SEQUENCES IS A COMMON-CAUSE OF THE HUNTER SYNDROME [J].
BONDESON, ML ;
DAHL, N ;
MALMGREN, H ;
KLEIJER, WJ ;
TONNESEN, T ;
CARLBERG, BM ;
PETTERSSON, U .
HUMAN MOLECULAR GENETICS, 1995, 4 (04) :615-621
[4]   Incontinentia pigmenti [J].
Francis, JS ;
Sybert, VP .
SEMINARS IN CUTANEOUS MEDICINE AND SURGERY, 1997, 16 (01) :54-60
[5]  
Jones AC, 1999, CLIN CHEM, V45, P1133
[6]   Selection against mutant alleles in blood leukocytes is a consistent feature in Incontinentia Pigmenti type 2 [J].
Parrish, JE ;
Scheuerle, AE ;
Lewis, RA ;
Levy, ML ;
Nelson, DL .
HUMAN MOLECULAR GENETICS, 1996, 5 (11) :1777-1783
[7]   GLUCOCORTICOID-SUPPRESSIBLE HYPERALDOSTERONISM RESULTS FROM HYBRID GENES CREATED BY UNEQUAL CROSSOVERS BETWEEN CYP11B1 AND CYP11B2 [J].
PASCOE, L ;
CURNOW, KM ;
SLUTSKER, L ;
CONNELL, JMC ;
SPEISER, PW ;
NEW, MI ;
WHITE, PC .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1992, 89 (17) :8327-8331
[8]  
Smahi A, 2000, NATURE, V405, P466