PT  - JOURNAL ARTICLE
AU  - Peter H Dixon
AU  - Pirada Trongwongsa
AU  - Shadi Abu-Hayyah
AU  - Sze Hwei Ng
AU  - Syed Ali Akbar
AU  - Nuzhat P Khawaja
AU  - Michael J Seckl
AU  - Philip M Savage
AU  - Rosemary A Fisher
TI  - Mutations in <em>NLRP7</em> are associated with diploid biparental hydatidiform moles, but not androgenetic complete moles
AID  - 10.1136/jmedgenet-2011-100602
DP  - 2012 Mar 01
TA  - Journal of Medical Genetics
PG  - 206--211
VI  - 49
IP  - 3
4099  - http://jmg.bmj.com/content/49/3/206.short
4100  - http://jmg.bmj.com/content/49/3/206.full
SO  - J Med Genet2012 Mar 01; 49
AB  - Background NLRP7 (NALP7) has been identified as the major gene involved in the inherited predisposition to recurrent molar pregnancies, a rare recessive condition in which affected individuals have complete hydatidiform moles of diploid biparental origin (BiCHM). The role of NLRP7 in other types of molar pregnancy and reproductive wastage has not been conclusively demonstrated. The purpose of this study was to clarify this by identifying NLRP7 variation in two clinically well-defined groups of patients: women with recurrent BiCHM, and women with three or more recurrent complete hydatidiform moles of proven androgenetic origin (AnCHM).Methods Fluorescent microsatellite genotyping of molar tissue was used to establish a diagnosis of recurrent BiCHM (four novel cases) or recurrent AnCHM (nine women with multiple CHM). These two groups were subsequently screened for mutations in NLRP7 using DNA sequencing. Additional screening for non-pathological variants was performed in 21 previously published cases of recurrent BiCHM. Taqman genotyping was used to determine the frequency of novel NLRP7 variants in two control cohorts of Caucasian and Asian women with no adverse reproductive outcomes.Results Of the four novel cases with recurrent BiCHM, two were homozygous for mutations in NLRP7 while one was a compound heterozygote for a nonsense mutation and a pathological variant. No NLRP7 mutations or pathological variants were identified in the fourth case. None of the women with AnCHM carried any mutations or pathological variants of NLRP7. A single case of AnCHM was found to be heterozygous for a novel variant (R413Q).Conclusion NLRP7 mutations do not represent a major cause of AnCHM.