Prevalence, persistence and microscopic aspects of the vomeronasal organ in normal versus embryos with chromosomal abnormalities

Abstract

Background. The objective of this study was to describe the histological and immunohistochemical aspects of vomeronasal organ in two groups of (normal and pathological) embryos and fetuses, with chromosomal morphological abnormalities. Methods. The research was based on a retrospective, descriptive analysis, carried out over a period of 5 years. The study included 46 biopsy fragments taken from aborted embryos and fetuses aged between 9 and 23 weeks. We compared the microscopic structure of the vomeronasal organ using different histologic and immunohistochemical staining procedures. Results. Our results showed that in both groups of embryos and fetuses there are three major stages of histological development of the vomeronasal organ, depending by intrauterine age. We also observed that in the group of abnormal embryos and fetuses, although the morphological and immunohistochemical characteristics of vomeronasal organ were similar to the control group, the specific structures of the vomeronasal organ persisted beyond 22 weeks. In the control group, the vomeronasal organ was no longer visible at this age. The results of the immunohistochemical study indicated that the positive surface for cytokines in the control group decreased with age, and in the group with morphological anomalies, the number of positive cells was low. On the other hand, in fetuses with chromosomal anomalies, the positivity, although a slight downward trend was recorded, it remained high. Conclusions. This study is still ongoing in order to identify the increased frequency of vomeronasal organ in fetuses. Moreover, we anticipate that our study can be a starting point for other researchers in order to identify a relationship between the behavioral pattern of the fetuses with trisomy 21 and the persistence of the VNO.

Keywords

• vomeronasal organ
• vomeronasal epithelium
• embryos
• immunochemistry
• histological findings