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Hum Mol Genet. 2018 Feb 1;27(3):430-439. doi: 10.1093/hmg/ddx411.

Transcriptome profiling of fetal Klinefelter testis tissue reveals a possible involvement of long non-coding RNAs in gonocyte maturation.

Author information

1
Department of Growth and Reproduction, Copenhagen University Hospital (Rigshospitalet), DK-2100 Copenhagen, Denmark.
2
DTU Multi-Assay Core, DTU Bioinformatics, Technical University of Denmark, DK-2800 Lyngby, Denmark.
3
Bioinformatics Research Center, Aarhus University, DK-8000 Aarhus, Denmark.
4
Department of Pathology, Rigshospitalet, DK-2100 Copenhagen, Denmark.

Abstract

In humans, the most common sex chromosomal disorder is Klinefelter syndrome (KS), caused by the presence of one or more extra X-chromosomes. KS patients display a varying adult phenotype but usually present with azoospermia due to testicular degeneration, which accelerates at puberty. The timing of the germ cell loss and whether it is caused by dysgenetic fetal development of the testes is not known. We investigated eight fetal KS testes and found a marked reduction in MAGE-A4-positive pre-spermatogonia compared with testes from 15 age-matched controls, indicating a failure of the gonocytes to differentiate into pre-spermatogonia. Transcriptome analysis by RNA-sequencing of formalin-fixed, paraffin-embedded testes originating from four fetal KS and five age-matched controls revealed 211 differentially expressed transcripts in the fetal KS testis. We found a significant enrichment of upregulated X-chromosomal transcripts and validated the expression of the pseudoautosomal region 1 (PAR1) gene, AKAP17A. Moreover, we found enrichment of long non-coding RNAs in the KS testes (e.g. LINC01569 and RP11-485F13.1). In conclusion, our data indicate that the testicular phenotype observed among adult men with KS is initiated already in fetal life by failure of the gonocyte differentiation into pre-spermatogonia, which could be due to aberrant expression of long non-coding RNAs.

PMID:
29186436
DOI:
10.1093/hmg/ddx411
[Indexed for MEDLINE]

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