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Published on: August 23, 2014
[Localization of the PITX2 gene expression in human eye cells in the course of prenatal development]
Insights
PITX2 gene expression is present in developing human eyes from 9.5 weeks, with notable levels in the cornea and lens. Expression patterns change throughout fetal development, peaking in the iridocorneal complex by week 18.
Area of Science:
- Developmental Biology
- Ophthalmology
- Genetics
Context:
- The development of the human eye involves complex gene regulation.
- PITX2 is a transcription factor crucial for ocular development.
Purpose:
- To investigate the spatiotemporal expression pattern of the PITX2 gene during human fetal eye development.
- To identify the specific PITX2 isoforms present in ocular tissues.
Summary:
- PITX2 gene expression was detected in human fetal eyes from 9.5 to 22 weeks of gestation using PCR.
- Expression was strongest in the cornea and lens, with dynamic changes observed across different developmental stages.
- Two eye-specific isoforms, PITX2A and PITX2B, were identified, and PITX2 mRNA was localized to ectodermal and neuroectodermal tissues via in situ hybridization.
Impact:
- Provides insights into the role of PITX2 in early eye morphogenesis.
- Contributes to understanding the genetic basis of congenital eye anomalies.
- Establishes a temporal and spatial map of PITX2 expression in the developing human eye.
Abstract:
The pattern of the PITX2 gene expression was studied in the cornea, lens, retina, iridocorneal complex (ICC), and eye coats of human fetuses at weeks 9.5-22 of intrauterine development. Using the PCR method, PITX2 expression in all these tissues was revealed already at the earliest stage studied (9.5 weeks), being especially strong in the anterior eye complex (the cornea and lens) and weaker in the retina and sclera. The level of PITX2 expression in all eye tissues slightly decreased by week 15, increased to a high level in the ICC on week 18, and further decreased in all tissues by week 22. Using cDNA derived from the whole eyes of 8-, 9-, 10.5-, and 11-week fetuses, the expression of two PITX2 isoforms specific for eye tissues (A and B) was revealed. By means of in situ hybridization, the PITX2 mRNA was localized in the eye tissues of ectodermal and neuroectodermal origin.
