BACKGROUND: Placental mesenchymal dysplasia (PMD) is a distinct syndrome of unknown aetiology that is associated with significant fetal morbidity and mortality. Intrauterine growth restriction is common, yet, paradoxically, many of the associated fetuses/newborns have been diagnosed with Beckwith-Wiedemann syndrome (BWS). METHODS: We report two cases of PMD with high levels of androgenetic (complete paternal uniparental isodisomy) cells in the placenta and document, in one case, a likely androgenetic contribution to the fetus as well. RESULTS: The same haploid paternal complement found in the androgenetic cells was present in coexisting biparental cells, suggesting origin from a single fertilisation event. CONCLUSIONS: Preferential allocation of the normal cells into the trophoblast explains the absence of trophoblast overgrowth, a key feature of this syndrome. Interestingly, the distribution of androgenetic cells appears to differ from that reported for artificially created androgenetic mouse chimeras. Androgenetic mosaicism for the first time provides an aetiology for PMD, and may be a novel mechanism for BWS and unexplained intrauterine growth restriction.
BACKGROUND: Placental mesenchymal dysplasia (PMD) is a distinct syndrome of unknown aetiology that is associated with significant fetal morbidity and mortality. Intrauterine growth restriction is common, yet, paradoxically, many of the associated fetuses/newborns have been diagnosed with Beckwith-Wiedemann syndrome (BWS). METHODS: We report two cases of PMD with high levels of androgenetic (complete paternal uniparental isodisomy) cells in the placenta and document, in one case, a likely androgenetic contribution to the fetus as well. RESULTS: The same haploid paternal complement found in the androgenetic cells was present in coexisting biparental cells, suggesting origin from a single fertilisation event. CONCLUSIONS: Preferential allocation of the normal cells into the trophoblast explains the absence of trophoblast overgrowth, a key feature of this syndrome. Interestingly, the distribution of androgenetic cells appears to differ from that reported for artificially created androgenetic mouse chimeras. Androgenetic mosaicism for the first time provides an aetiology for PMD, and may be a novel mechanism for BWS and unexplained intrauterine growth restriction.
Authors: F J Paradinas; N J Sebire; R A Fisher; H C Rees; M Foskett; M J Seckl; E S Newlands Journal: Histopathology Date: 2001-11 Impact factor: 5.087
Authors: J-M Laberge; Y Patenaude; V Desilets; L Cartier; S Khalife; L Jutras; M-F Chen Journal: Fetal Diagn Ther Date: 2005 Mar-Apr Impact factor: 2.587
Authors: Russell Vang; Mamta Gupta; Lee-Shu-Fune Wu; Anna V Yemelyanova; Robert J Kurman; Kathleen M Murphy; Cheryl Descipio; Brigitte M Ronnett Journal: Am J Surg Pathol Date: 2012-03 Impact factor: 6.394
Authors: Mamta Gupta; Russell Vang; Anna V Yemelyanova; Robert J Kurman; Fanghong Rose Li; Emily C Maambo; Kathleen M Murphy; Cheryl DeScipio; Carol B Thompson; Brigitte M Ronnett Journal: Am J Surg Pathol Date: 2012-12 Impact factor: 6.394