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48,XXYY, 48,XXXY and 49,XXXXY syndromes: not just variants of Klinefelter syndrome.
Acta Paediatr 2011; 100(6):851-60AP

Abstract

Sex chromosome tetrasomy and pentasomy conditions occur in 1:18,000-1:100,000 male births. While often compared with 47,XXY/Klinefelter syndrome because of shared features including tall stature and hypergonadotropic hypogonadism, 48,XXYY, 48,XXXY and 49,XXXXY syndromes are associated with additional physical findings, congenital malformations, medical problems and psychological features. While the spectrum of cognitive abilities extends much higher than originally described, developmental delays, cognitive impairments and behavioural disorders are common and require strong treatment plans. Future research should focus on genotype-phenotype relationships and the development of evidence-based treatments.

CONCLUSION

The more complex physical, medical and psychological phenotypes of 48,XXYY, 48,XXXY and 49,XXXXY syndromes make distinction from 47,XXY important; however, all of these conditions share features of hypergonadotropic hypogonadism and the need for increased awareness, biomedical research and the development of evidence-based treatments.

Authors+Show Affiliations

Section of Neurodevelopmental Behavioral Pediatrics, Department of Pediatrics, University of Colorado School of Medicine, Aurora, USA. Tartaglia.nicole@tchden.orgNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Review

Language

eng

PubMed ID

21342258

Citation

Tartaglia, Nicole, et al. "48,XXYY, 48,XXXY and 49,XXXXY Syndromes: Not Just Variants of Klinefelter Syndrome." Acta Paediatrica (Oslo, Norway : 1992), vol. 100, no. 6, 2011, pp. 851-60.
Tartaglia N, Ayari N, Howell S, et al. 48,XXYY, 48,XXXY and 49,XXXXY syndromes: not just variants of Klinefelter syndrome. Acta Paediatr. 2011;100(6):851-60.
Tartaglia, N., Ayari, N., Howell, S., D'Epagnier, C., & Zeitler, P. (2011). 48,XXYY, 48,XXXY and 49,XXXXY syndromes: not just variants of Klinefelter syndrome. Acta Paediatrica (Oslo, Norway : 1992), 100(6), pp. 851-60. doi:10.1111/j.1651-2227.2011.02235.x.
Tartaglia N, et al. 48,XXYY, 48,XXXY and 49,XXXXY Syndromes: Not Just Variants of Klinefelter Syndrome. Acta Paediatr. 2011;100(6):851-60. PubMed PMID: 21342258.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - 48,XXYY, 48,XXXY and 49,XXXXY syndromes: not just variants of Klinefelter syndrome. AU - Tartaglia,Nicole, AU - Ayari,Natalie, AU - Howell,Susan, AU - D'Epagnier,Cheryl, AU - Zeitler,Philip, Y1 - 2011/04/08/ PY - 2011/2/24/entrez PY - 2011/2/24/pubmed PY - 2011/8/10/medline SP - 851 EP - 60 JF - Acta paediatrica (Oslo, Norway : 1992) JO - Acta Paediatr. VL - 100 IS - 6 N2 - UNLABELLED: Sex chromosome tetrasomy and pentasomy conditions occur in 1:18,000-1:100,000 male births. While often compared with 47,XXY/Klinefelter syndrome because of shared features including tall stature and hypergonadotropic hypogonadism, 48,XXYY, 48,XXXY and 49,XXXXY syndromes are associated with additional physical findings, congenital malformations, medical problems and psychological features. While the spectrum of cognitive abilities extends much higher than originally described, developmental delays, cognitive impairments and behavioural disorders are common and require strong treatment plans. Future research should focus on genotype-phenotype relationships and the development of evidence-based treatments. CONCLUSION: The more complex physical, medical and psychological phenotypes of 48,XXYY, 48,XXXY and 49,XXXXY syndromes make distinction from 47,XXY important; however, all of these conditions share features of hypergonadotropic hypogonadism and the need for increased awareness, biomedical research and the development of evidence-based treatments. SN - 1651-2227 UR - https://www.unboundmedicine.com/medline/citation/21342258/48XXYY_48XXXY_and_49XXXXY_syndromes:_not_just_variants_of_Klinefelter_syndrome_ L2 - https://doi.org/10.1111/j.1651-2227.2011.02235.x DB - PRIME DP - Unbound Medicine ER -