Appendix References of cases with UPD and information on parental age either in the paper or by personal communication Maternal heterodisomy in cases with a normal karyotype: Abu-Amero SN, Ali Z, Abu-Amero KK, Stanier P, Moore GE. An analysis of common isodisomic regions in five mUPD 16 probands. J Med Genet 1999;36:204-207. Balmer D, Baumer A, Röthlisberger B, Schinzel A. Severe intra-uterine growth retardation in a patient with maternal uniparental disomy 22 and a 22-trisomic placenta. Prenat Diagn 1999;19:1061-1062. Bernard LE, Penaherrera MS, Van Allen MI, Wang MS, Yong S-L, Gareis F, Langlois S, Robinson WP. Clinical and molecular findings in two patients with Russell Silver syndrome and UPD7. Am J Med Genet 1999;87:230-236. Bilimoria KY, Rothenberg JM. Prenatal diagnosis of a trisomy 7/maternal uniparental heterodisomy 7 mosaic fetus. Am J Med Genet 2003;118:60-3. Blayau M. Odent S, Dubourg C, Dabadie A, David V. Alpha1-antitrypsin deficiency due to maternal uniparental disomy for chromosome 14. Europ J Hum Genet 2002;10:Suppl:1:P0974. Chan Y, Silverman N, Jackson L, Wapner R, Wallerstein R. Maternal uniparental disomy of chromosome 16 and body stalk anomaly. Am J Med Genet 2000;94:284-286. Chudoba I, Franke Y, Senger G, Sauerbrei G, Demuth S, Beensen V, Neumann A, Hansmann I, Claussen U. Maternal UPD 20 in a hyperactive child with severe growth retardation. Eur J Hum Genet 1999;7:533-540. De Pater JM, Schuring-Blom GH, van den Bogaard R, van der Sijs-Bos CJM, Christiaens GCML, Stoutenbeek Ph, Leschot NJ. Maternal uniparental disomy for chromosome 22 in a child with generalized mosaicism for trisomy 22. Prenat Diagn 1997;17:81-86. Eggermann T, Mergenthaler S, Eggermann K, Albers A, Fusch C, Ranke MB, Wollmann HA. Identification of interstitial maternal uniparental disomy (UPD) (14) and complete maternal upd (20) in a cohort of growth-retarded patients. J Med Genet 2001;38:86-89. Eggermann T, Wollmann HA, Kuner R, Eggermann K, Enders H, Kaiser P, Ranke MB. Molecular studies in 37 Silver-Russell syndrome patients: frequency and etiology of uniparental disomy. Hum Genet 1997;100:415-419. Fokstuen S, Ginsburg C, Zachmann M, Schinzel A. Maternal uniparental disomy 14 as a cause of intrauterine growth retardation and early onset of puberty. J Pediatr 1999;134:689695. Fritz B, Aslan M, Kalscheuer V, Ramsing M, Saar K, Fuchs B, Rehder H. Low incidence of UPD in spontaneous abortions beyond the 5th gestational week. Eur J Hum Genet 2001;9:910-916. Garber A, Carlson D, Schreck R, Fischel-Ghodsian N, Hsu W-T, Oetztas S, Pepkowitz S, Graham JM. Prenatal diagnosis and dysmorphic findings in mosaic trisomy 16. Prenat Diagn 1994;14:257-268. Genuardi M, Tozzi C, Pomponi MG, Stagni ML, Della Monica M, Scarano G, Calvieri F, Loredana T, Neri G. Mosaic trisomy 17 in amniocytes: phenotypic outcome, tissue distribution, and uniparental disomy studies. Europ J Hum Genet 1999;7:421-426. Hannula K, Lipsanen-Nyman M, Kristo P, Kaitila I, Simola KO, Lenko HL, Tapanainen P, Holmberg C, Kere J. Genetic screening for maternal uniparental disomy of chromosome 7 in prenatal and postnatal growth retardation of unknown cause. Pediatrics 2002;109:441-448. Hansen WF, Bernhard LE, Langlois S, Rao KW, Chescheir NC, Aylsworth AS, Smith I, Robinson WP, Barrett IJ, Kalousek DK. Maternal uniparental disomy 2 and confined placental mosaicism for trisomy 2 in a fetus with intrauterine growth restriction, hypospadias, and oligohydramnios. Prenat Diagn 1997;17:443-50. Harrison K, Eisenger K, Anyane-Yeboa K, Brown S. Maternal uniparental disomy of chromosome 2 in a baby with trisomy 2 mosaicism in amniotic fluid culture. Am J Med Genet 1995;58:147-151. Heide E, Heide K-G, Rodewald A. Maternal uniparental disomy (UPD) for chromosome 2 discovered by exclusion of paternity. Am J Med Genet 2000;92:260-263. Henderson DJ, Sherman LS, Loughna SC, Bennett PR, Moore GE. Early embryonic failure associated with uniparental disomy for human chromosome 21. Hum Mol Genet 1994;3:13731376. Hordijk R, Wierenga H, Scheffer H, Leegte B, Hofstra RMW, Stolte-Dijkstra I. Maternal uniparental disomy for chromosome 14 in a boy with a normal karyotype. J Med Genet 1999;36:782-785. Hsu W-T, Shchepin DA, Mao R, Berry-Kravis E, Garber AP, Fischel-Ghodsian N, Falk RE, Carlson DE, Roeder ER, Leeth EA, Hajianpour MJ, Wang J-ChC, Rosenblum-Vos LS, Bhatt SD, Karson EM, Hux ChH, Trunca C, Bialer MG, Linn SK, Schreck RR. Mosaic trisomy 16 ascertained through amniocentesis: evaluation of 11 new cases. Am J Med Genet 1998;80:473-480. Jones C, Booth C, Rita D, Jazmines L, Spiro R, Mc Culloch B, Mc Caskill Ch, Shaffer LG. Identification of a case of maternal disomy of chromosome 10 associated with confined placental mosaicism. Prenat Diagn 1995;15:843-848. Kalousek DK, Langlois S, Barrett I, Yam I, Wilson DR, Howard- Peebles PN, Johnson MP, Giorgiutti E. Uniparental disomy for chromosome 16 in humans. Am J Hum Genet 1993;52:816. Kotzot D, Balmer D, Baumer A, Chrzanowska K, Hamel BCJ, Ilyina H, Krajewska-Walasek M, Otten BJ, Lurie IW, Otten BJ, Schoenle E, Tariverdian G, Schinzel A. Maternal uniparental disomy 7 - Review and further delineation of the phenotype. Eur J Pediatr 2000;159:247-256. Kuchinka BD, Barrett IJ, Moya G, Sanchez JM, Langlois S, Yong S-L, Kalousek DK, Robinson WP. Two cases of confined placental mosaicism for chromosome 4, including one with maternal uniparental disomy. Prenat Diagn 2001;21:36-39. Langlois S, Yong SL, Wilson RD, Kwong LC, Kalousek DK. Prenatal and postnatal failure associated with maternal heterodisomy for chromosome 7. J Med Genet 1995;32:871-875. Lindor NM, Jalal SM, Thibodeau SN, Bonde D, Sauser KL, Karnes PS. Mosaic trisomy 16 in a thriving infant; maternal heterodisomy for chromosome 16. 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Rothlisberger B, Zerova T, Kotzot D, Buzhievskaya TI, Balmer D, Schinzel A. Supernumerary marker chromosome (1) of paternal origin and maternal uniparental disomy 1 in a developmentally delayed child. J Med Genet 2001;38:885-8. Salafsky IS, MacGregor SN, Claussen U, von Eggeling F. Maternal UPD 20 in an infant from a pregnancy with mosaic trisomy 20. Prenat Diagn 2001;21:860-3. Sanlaville D, Aubry MC, Dumez Y, Nolen MC, Amiel J, Pinson MP, Lyonnet S, Munnich A, Vekemans M, Morichon-Delvallez N. Maternal uniparental heterodisomy of chromosome 14: chromosomal mechanism and clinical follow up. J Med Genet 2000;37:525-528. Schneider AS, Bischoff FZ, McCaskill Ch, Coady ML, Stopfer JE, Shaffer LG. Comprehensive 4-year follow-up on a case of maternal heterodisomy for chromosome 16. Am J Med Genet 1996;66:204-208. Sirchia SM, De Andreis Ch, Pariani S, Grimoldi MG, Molinari A, Buscaglia M, Simoni G. 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Am J Med Genet 1997;70:387-390. Maternal heterodisomy associated with a chromosome aberration Berend MJW, Hordijk R, Oosterwijk JC, Halley DJJ, Sorgedrager N. Two cases of maternal uniparental disomy 14 with a phenotype overlapping with the Prader-Willi phenotype. Am J Med Genet 1999;84:76-79. Cave H (personal communication). Dawson AJ, Mears AJ, Chudley AE, Bech-Hansen T, McDermid H. Der(22)t(11;22) resulting from paternal de novo translocation, adjacent 1 segregation, and maternal heterodisomy of chromosome 22. J Med Genet 1996;33:952-956. Dupont JM, Cuisset L, Cartigny M, Le Tessier D, Vasseur C, Rabineau D, Jeanpierre M. Familial reciprocal translocation t(7;16) associated with maternal uniparental disomy 7 in a Silver-Russell patient. Am J Med Genet 2002;111:405-8. Healey S, Powell F, Battersby M, Chenevix-Trench G, McGill J. Distinct phenotype in maternal uniparental disomy of chromosome 14. Am J Med Genet 1994;51:147-149. 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Trisomy first, translocation second, uniparental disomy and partial trisomy third: A new mechanism for complex chromosomal aneuploidy. Eur J Hum Genet 1997;5:308-314. Temple IK, Cockwwell A, Hassold T, Pettay D, Jacobs P. Maternal uniparental disomy for chromosome 14. J Med Genet 1991;28:511-514. Wang J-ChC, Mamunes P, Kou S-Y, Schmidt J, Mao R, Hsu WT. Centromeric DNA break in a 10;16 reciprocal translocation associated with trisomy 16 confined placental mosaicism and maternal unipartental disomy for chromosome 16. Am J Med Genet 1998;80:418-422. Maternal isodisomy in cases with a normal karyotype Bernard LE, Penaherrera MS, Van Allen MI, Wang MS, Yong S-L, Gareis F, Langlois S, Robinson WP. Clinical and molecular findings in two patients with Russell Silver syndrome and UPD7. Am J Med Genet 1999;87:230-236. Bruyère H, Rupps R, Kuchinka BD, Friedman JM, Robinson WP. Recurrent trisomy 21 in a couple with a child presenting trisomy 21 mosaicism and maternal uniparental disomy for chromosome 21 in the euploid cell line. Am J Med Genet 2000;94:35-41. Dufourcq-Lagelouse R, Lambert N, Duval M, Viot G, Vilmer E, Fischer A, Prieur M, de Saint Basile G. Chediak Higashi syndrome associated with maternal uniparental isodisomy of chromosome 1. Europ J Hum Genet 1999;7:633-637 Eggermann T, Wollmann HA, Kuner R, Eggermann K, Enders H, Kaiser P, Ranke MB. Molecular studies in 37 Silver-Russell syndrome patients: frequency and etiology of uniparental disomy. Hum Genet 1997;100:415-419. Hannula K, Lipsanen-Nyman M, Kristo P, Kaitila I, Simola KO, Lenko HL, Tapanainen P, Holmberg C, Kere J. Genetic screening for maternal uniparental disomy of chromosome 7 in prenatal and postnatal growth retardation of unknown cause. Pediatrics 2002;109(3):441-448. Hehr U, Dörr S, Hagemann M, Hansmann I, Preiss U, Brömme S. 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Maternal uniparental isodisomy for chromosome 14 detected prenatally. Prenat Diagn 1999;19:681-684. Schlegel M, Baumer A, Riegel M, Wiedemann U, Schinzel A. Maternal uniparental isodisomy 10 and mosaicism for an additional marker chromosome derived from the paternal chromosome 10 in a fetus. Prenat Diagn 2002;22:418-421. Slater H, Shaw JH, Dawson G, Bankier A, Forrest SM. Maternal uniparental disommy of chromosome 13 in a phenotypically normal child. J Med Genet 1994;31:644-646. Spence JE, Perciaccante RG, Greig GM, Huntington FW, Ledbetter DH, Hejtmancik JF, Pollack MS, O'Brien WE, Beaudet AL. Uniparental disomy as a mechanism for human genetic disease. Am J Hum Genet 1988;42:217-226. Spiekerkoetter U, Eeds A, Yue Z, Haines J, Strauss AW, Summar M. Uniparental disomy of chromosome 2 resulting in lethal trifunctional protein deficiency due to homozygous alphasubunit mutations. Hum Mutat 2002;20:447-51. Stallard R, Krueger S, James RS, Schwartz S. 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