Related Experiment Video
Updated: Jul 28, 2026

09:03
Semiconductor Sequencing for Preimplantation Genetic Testing for Aneuploidy
Published on: August 25, 2019
Risk factors for birth defects in Singapore: a case control study
1Department of Community, Occupational and Family Medicine, National University of Singapore.
Annals of the Academy of Medicine, Singapore
|May 1, 1995
Summary
A family history of birth defects and previous abnormal babies are significant risk factors for congenital anomalies. Other factors include certain medications, traditional remedies, injuries, and maternal diabetes during pregnancy.
Area of Science:
- Medical Research
- Epidemiology
- Public Health
Background:
- Birth defects pose a significant global health challenge.
- Identifying risk factors is crucial for prevention strategies.
Purpose of the Study:
- To investigate potential risk factors associated with birth defects.
- To provide data for targeted interventions and public health policies.
Main Methods:
- A matched case-control study was conducted.
- 572 matched pairs of infants (cases with defects, controls without) were analyzed.
- Data collected via interviews and medical records; analyzed using conditional logistic regression.
Main Results:
- Strongest risk factors identified: family history of birth defects (OR 3.3) and previous abnormal baby (OR 2.4).
- Other significant factors included injuries during pregnancy (OR 2.2) and traditional medicine use (OR 1.4).
- Maternal occupation and diabetes mellitus showed some association with increased risk.
Conclusions:
- Family history and prior adverse pregnancy outcomes are key predictors of birth defects.
- Environmental and medical factors during pregnancy warrant further investigation for preventative measures.
Related Concept Videos
Spermatogenesis
Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...
Meiosis vs. Mitosis
Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Nondisjunction
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...
Teratogenicity
The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
Pathophysiology of Diabetes
Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility, suggesting a...
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility, suggesting a...
Development of the Oral Microbiota
The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...

