Xq chromosome duplication in males: Clinical, cytogenetic and array CGH characterization of a new case and review

Sabrina F. Cheng, Katherine A. Rauen, Daniel Pinkel, Donna Albertson, Philip D. Cotter

Research output: Contribution to journalArticle

Abstract

Males with duplications within the long arm of the X chromosome are rare and most cases are inherited from a maternal heterozygote. We report a male with a de novo Xq duplication and review of the literature. The proband was ascertained prenatally after an abnormal expanded alpha-fetoprotein (AFP) screen and abnormal ultrasound findings. Chromosome analysis on amniocyte and subsequent peripheral blood lymphocyte cultures showed a male karyotype containing additional material on the long arm of the X chromosome. Fluorescence in situ hybridization with an X chromosome whole chromosome paint probe showed that the additional material was derived from the X chromosome, interpreted as a dup(X)(q13.3q24). Further characterization of the duplication by array CGH showed a duplication size between 30-44 Mb as determined by the map position of the flanking clones on the array, and refined the breakpoints of the duplicated region to Xq21.32 → Xq25. At birth, the proband had multiple craniofacial abnormalities, musculoskeletal anomalies, bilateral cryptorchidism with scrotal hypoplasia, conductive hearing loss, and profound generalized hypotonia despite normal birthweight, length, and head circumference. Although data regarding Xq duplications in males are limited, a clear pattern of characteristic features can be discerned as illustrated in the present case and confirmed in our literature review. Mental, psychomotor and growth retardation, as well as, craniofacial anomalies, muscle hypotonia, hypoplastic genitalia, cryptorchidism, feeding difficulties, and endocrine dysfunction are all significant issues in these individuals.

Original languageEnglish (US)
Pages (from-to)308-313
Number of pages6
JournalAmerican Journal of Medical Genetics
Volume135 A
Issue number3
DOIs
StatePublished - Jun 15 2005

Fingerprint

Chromosome Duplication
X Chromosome
Cytogenetics
Muscle Hypotonia
Cryptorchidism
Chromosomes
Craniofacial Abnormalities
Conductive Hearing Loss
Multiple Abnormalities
Genitalia
Paint
alpha-Fetoproteins
Heterozygote
Fluorescence In Situ Hybridization
Karyotype
Clone Cells
Head
Mothers
Parturition
Lymphocytes

Keywords

  • Array comparative genomic hybridization
  • Duplication
  • Genotype-phenotype correlation
  • Prenatal diagnosis
  • X chromosome

ASJC Scopus subject areas

  • Genetics(clinical)

Cite this

Xq chromosome duplication in males : Clinical, cytogenetic and array CGH characterization of a new case and review. / Cheng, Sabrina F.; Rauen, Katherine A.; Pinkel, Daniel; Albertson, Donna; Cotter, Philip D.

In: American Journal of Medical Genetics, Vol. 135 A, No. 3, 15.06.2005, p. 308-313.

Research output: Contribution to journalArticle

Cheng, Sabrina F. ; Rauen, Katherine A. ; Pinkel, Daniel ; Albertson, Donna ; Cotter, Philip D. / Xq chromosome duplication in males : Clinical, cytogenetic and array CGH characterization of a new case and review. In: American Journal of Medical Genetics. 2005 ; Vol. 135 A, No. 3. pp. 308-313.
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