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Reproductive Sciences

, Volume 18, Issue 11, pp 1146–1153 | Cite as

Differential Gene Expression in the Adrenals of Normal and Anencephalic Fetuses and Studies Focused on the Fras-1-Related Extracellular Matrix Protein (FREM2) Gene

  • Christine W. Mansfield
  • Bruce R. CarrEmail author
  • Ona M. Faye-Petersen
  • Dongquan Chen
  • Yewei Xing
  • William E. Rainey
  • C. Richard ParkerJr
Original Articles

Abstract

Precis

Many genes are differentially expressed in normal compared to anencephalic human fetal adrenals (HFAs), especially the Fras-1-related extracellular matrix protein (FREM2) gene. FREM2 expression appears to be regulated by adrenocorticotrophic hormone (ACTH).

Context

The expression profiles of genes responsible for cortical growth and zonation in the HFA gland are poorly characterized. The neural tube disorder anencephaly is associated with fetal adrenal hypoplasia with a large size reduction of the fetal zone of the HFA.

Objective

To determine gene expression profile differences in the adrenals of anencephalic compared to normal HFAs to identify genes that may play important roles in adrenal development.

Design and Methods

Fresh tissues were obtained at the time of autopsy from normal and anencephalic human fetuses delivered at mid-gestation. The following techniques were used: cell culture, messenger RNA (mRNA) extraction, microarray analysis, complementary DNA (cDNA) synthesis, quantitative real-time reverse transcriptase polymerase chain reaction (QT-PCR).

Results

We identified over 40 genes expressed at levels 4-fold or greater in the normal versus anencephalic HFAs and that 28 genes were expressed at increased levels in the anencephalic HFA. The expression of FREM2 at approximately 40-fold greater levels in the normal HFA compared to the HFA of anencephalic fetuses was confirmed by QT-PCR. Expression of FREM2 in the kidney was not significantly different between normal and anencephalic fetuses. In cultured HFA cells, ACTH treatment for 48 hours increased the expression of FREM2 and a gene responsive to ACTH, CYP17, but not tyrosine hydroxylase.

Conclusions

Abnormal expression of many genes may be involved in the adrenal hypoplasia seen in anencephaly. FREM2 appears to be regulated by ACTH and is the most differentially expressed gene, which may be important in the development and function of the HFA, particularly the fetal zone of the HFA.

Keywords

fetal adrenal gland anencephaly FREM2 Fras-1-related extracellular matrix protein ACTH 

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Copyright information

© Society for Reproductive Investigation 2011

Authors and Affiliations

  • Christine W. Mansfield
    • 1
  • Bruce R. Carr
    • 1
    Email author
  • Ona M. Faye-Petersen
    • 2
  • Dongquan Chen
    • 3
  • Yewei Xing
    • 4
  • William E. Rainey
    • 4
  • C. Richard ParkerJr
    • 5
  1. 1.Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and InfertilityUniversity of Texas Southwestern Medical Center at DallasDallasUSA
  2. 2.Department of PathologyUniversity of Alabama at BirminghamBirminghamUSA
  3. 3.Biostatics and Bioinformatics Shared Facility, Comprehensive Cancer Center, Division of Preventive MedicineUniversity of Alabama at BirminghamBirminghamUSA
  4. 4.Department of PhysiologyMedical College of GeorgiaAugustaUSA
  5. 5.Department of Obstetrics and GynecologyUniversity of Alabama at BirminghamBirminghamUSA

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