Abstract
We describe a male infant with severe mental retardation and autism with a duplication of the short arm of the X chromosome. Chromosome painting confirmed the origin of this X duplication. Molecular cytogenetic analysis with fluorescence in situ hybridization (FISH) identified one copy of the zinc finger protein on the X chromosome (ZFX) and two copies of the steroid sulfatase gene (STS), further delineating the breakpoints. Based on cytogenetic and molecular comparisons of cases from the literature of sex-reversal in dup(X),Y patients and our patient, we suggest that a possible secondary sexinfluencing gene involved in the regulation of sex determination or testis morphogenesis is present at the distal Xp21.1 to p21.2 region.
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Arn P, Chen H, Tuck-Miller C, Mankinen C, Wachtel SS (1993) Familial duplication of Xp 21: evidence for an X-linked testis determining gene. Am J Hum Genet 53 [Suppl]:A635
Bernstein R, Jenkins T, Dawson B, Wagner J, Dewald G, Koo GC, Wachtel SS (1980) Female phenotype and multiple abnormalities in sibs with a Y chromosome and partial X chromosome duplication: H-Y antigen and Xg blood group findings. J Med Genet 17:291–300
Berta P, Hawkins JR, Sinclair AH, Taylor A, Griffiths BL, Goodfellow PN, Fellous M (1990) Genetic evidence equating SRY and the testis-determining factor. Nature 348:448–450
Cianchetti C, Muntoni F, Falchi AM, Nucaro A, Sannio-Fancello G, Cao A, Marrosu MG (1992) X-linked mental retardation and characteristic physical features in two brothers with duplication Xp22-Xpter. Am J Med Genet 43:475–478
Deng H-X, Xia JH, Ishikawa M, Niikawa N (1990) Parental origin and mechanism of formation of X chromosome structural abnormalities: four cases determined with RFLPs. Jpn J Hum Genet 35:245–251
Fechner PY, Marcantonio SM, Jaswaney V, Stetten G, Goodfellow PN, Migeon CJ, Smith KD, Berkovitz GD, Amrhein JA, Bard PA, Lee PA, Reid C, Tsalikian E, Urban M (1993) The role of the sex-determining region Y gene in the etiology of 46,XX maleness. J Clin Endocrinol Metabol 76:690–695
Ferguson-Smith MA (1992) Abnormalities of human sex determination. J Inherited Metab Dis 15:518–525
Gubbay J, Collignon J, Koopman P, Capel B, Economou A, Munsterberg A, Vivian N, Goodfellow P, Lovell-Badge R (1990) A gene mapping to the sex-determining region of the mouse of the mouse Y chromosome is a member of a novel family of embryonically expressed genes. Nature 346:245–250
Hawkins JR, Taylor A, Berta P, Levilliers J, Van der Auwera B, Goodfellow PN (1992) Mutational analysis of SRY: nonsense and missense mutations in XY sex reversal. Hum Genet 88:471–474
Ikeuchi T (1984) Inhibitory effect of ethidium bromide on mitotic chromosome condensation and its application to high-resolution banding. Cytogenet Cell Genet 38:56–61
Jager RJ, Harley VR, Pfeiffer RA, Goodfellow PN, Scherer G (1992) A familial mutation in the testis-determining gene SRY shared by both sexes. Hum Genet 90:350–355
Narahara K, Kodama Y, Kimura S, Kimoto H (1979) Probable inverted tandem duplication of Xp in a 46,Xp+Y boy. Jpn Hum Genet 24:105–110
Nielsen KB, Langkjaer F (1982) Inherited partial X chromosome duplication in a mentally retarded male. J Med Genet 19:222–224
Nielsen KB, Dyggve HV, Knudsen H, Olsen J (1983) A chromosomal survey of an institution for the mentally retarded: study of 476 karyotypes with banding techniques and clinical assessment of patients with chromosome anomalies. Dan Med Bull 30:5–13
Ogata T, Hawkins JR, Taylor A, Matsuo N, Hata J, Goodfellow PN (1992) Sex reversal in a child with a 46,X,Yp+ karyotype: support for the existence of a gene(s), located in distal Xp, involved in testis formation. J Med Genet 29:226–230
Petit C, Chapelle A de la, Levilliers J, Castillo S, Noel B, Weissenbach J (1987) An abnormal terminal X-Y interchange accounts for most but not all cases of human XX maleness. Cell 49:595–602
Rao PN, Hayworth R, Akots G, Pettenati MJ, Bowden DW (1992) Physical localization of chromosome 20 markers using somatic cell hybrid cell lines and fluorescence in situ hybridization. Genomics 14:532–535
Rothschild CB, Akots G, Hayworth R, Pettenati MJ, Rao PN, Wood P, Stoltz F-M, Hansmann I, Serino K, Keith TP, Fajans SS, Bowden DW (1993) A genetic map of chromosome 20q12-q13. 1: Multiple highly polymorphic microsatellite and RFLP markers linked to the maturity-onset diabetes of the young (MODY) locus. Am J Hum Genet 52:110–123
Scherer G, Schempp W, Baccichetti C, Lenzini E, Bricarelli FD, Carbone LD, Wolf U (1989) Duplication of an Xp segment that includes the ZFX locus causes sex inversion in man. Hum Genet 81:291–294
Schneider-Gadicke A, Beer-Romero P, Brown LG, Nussbaum R, Page DC (1989) ZFX has a similar structure to ZFY, the putative human sex-determinant, and escapes X inactivation. Cell 57:1247–1258
Simpson JL, Blagowidow N, Martin AO (1981) XY gonadal dysgenesis: genetic heterogeneity based upon clinical observations, H-Y antigen status and segregation analysis. Hum Genet 58:91–97
Sinclair AH, Berta P, Palmer MS, Hawkins JR, Griffiths BL, Smith MJ, Foster JW, Frischauf A-M, Lovell-Badge R, Goodfellow PN (1990) A gene from the human sex-determining region encodes a protein with a homology to a conserved DNA-binding motif. Nature 346:240–244
Tommerup N, Schempp W, Meinecke P, Pederson S, Bolund L, Brandt C, Goodpasture C, Guldberg P, Held KR, Reinwein H, Saugstad OD, Scherer G, Skjeldal O, Toder R, Westvik J, Hagen CB van der, Wolf U (1993) Assignment of an autosomal sex reversal locus (SRA1) and campomelic dysplasia (CMPD1) to 17q24. 3-q25. 1. Nature 4:170–174
Tuck-Muller CM, Martinez JE, Batista DAS, Kearns WG, Wertlecki W (1993) Duplication of the short arm of the X chromosome in mother and daughter. Hum Genet 91:395–400
Wyandt HE, Bugeau-Michaud L, Skare JC, Milunsky A (1991) Partial duplication of Xp: a case report and review of previously reported cases. Am J Med Genet 40:280–283
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Rao, P.N., Klinepeter, K., Stewart, W. et al. Molecular cytogenetic analysis of a duplication Xp in a male: further delineation of a possible sex influencing region on the X chromosome. Hum Genet 94, 149–153 (1994). https://doi.org/10.1007/BF00202860
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DOI: https://doi.org/10.1007/BF00202860