Monogenowa

Monogenowa, in genetics, refers to a trait or disease caused by variation in a single gene. It is used to describe monogenic conditions, which stand in contrast to polygenic and multifactorial traits that involve multiple genes and sometimes environmental factors. Monogenowa disorders often follow Mendelian inheritance patterns, though penetrance, expressivity, and genetic heterogeneity can complicate the presentation.

Inheritance patterns observed in monogenic conditions include autosomal dominant, autosomal recessive, X-linked, and, in some cases, mitochondrial (maternal) inheritance. Autosomal dominant diseases require only one mutated allele to manifest, while autosomal recessive conditions require mutations in both copies of a gene. X-linked disorders mainly affect males and arise from mutations on the X chromosome. Mitochondrial disorders are inherited from the mother due to the transmission of mitochondrial DNA. Examples of well-known monogenic diseases include autosomal dominant Marfan syndrome (FBN1) and autosomal recessive cystic fibrosis (CFTR), as well as X-linked Duchenne muscular dystrophy (DMD) and mitochondrial Leber hereditary optic neuropathy.

Diagnosis typically involves genetic testing, such as targeted gene sequencing, gene panels, or broader approaches like exome or genome sequencing, to identify pathogenic variants. Genetic counseling is important for risk assessment, family planning, and discussing implications for relatives. Management is often symptom-directed and may include surveillance, medical or surgical treatments, and, in some cases, emerging gene-targeted therapies or participation in research studies.

In Polish usage, monogenowa serves as the feminine form of the adjective describing a noun (for example, choroba monogenowa) and denotes that the condition is caused by a single-gene defect.