Exp Clin Endocrinol Diabetes 2010; 118(7): 405-409
DOI: 10.1055/s-0029-1225612
Article

© J. A. Barth Verlag in Georg Thieme Verlag KG Stuttgart · New York

A Novel Mutation (V101A) of the LHX4 Gene in a Japanese Patient with Combined Pituitary Hormone Deficiency

T. Tajima1 , T. Yorifuji2 , K. Ishizu1 , K. Fujieda3
  • 1Department of Pediatrics, Hokkaido University School of Medicine, Sapporo, Japan
  • 2Department of Pediatrics, Kyoto University Hospital, Kyoto, Japan
  • 3Department of Pediatrics, Asahikawa Medical College Midorigaoka, Higashi, Asahikawa, Japan
Weitere Informationen

Publikationsverlauf

received 07.01.2009 first decision 15.05.2009

accepted 04.06.2009

Publikationsdatum:
23. Oktober 2009 (eFirst)

Abstract

Objective: LHX4, a LIM-homeodomain transcription factor, is required for development of the pituitary and nervous system. Several mutations of the LHX4 gene have been identified in patients with combined pituitary hormone deficiency (CPHD). The objective of the study was to clarify the molecular basis of a Japanese patient of CPHD with a small anterior pituitary and an ectopic posterior pituitary.

Methods: Genomic DNA was extracted from blood samples of the patient. Exons and exon-intron junctions of the LHX4 gene were amplified and sequenced. An expression vector of the mutant LHX4 protein was constructed and its function was analyzed in vitro.

Results: A novel missense mutation (V101A) was identified. In vitro transfection studies demonstrated that V101A mutant LHX4 was unable to activate the POU1F1 and FSHβ subunit gene promoter, indicating a loss of function mutation.

Conclusion: Our results identify a novel loss of function mutation of the LHX4 gene in a Japanese patient with CPHD.

References

Correspondence

T. Tajima, MD, PhD 

Department of Pediatrics

Hokkaido University School of Medicine

N15, W7

060-0835 Sapporo

Japan

eMail: tajeari@hokudai.med.ac.jp