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Abstract Single gene disorders with Mendelian inheritance patterns have contributed greatly to the identification of genes and pathways implicated in genetic disease. In these cases, molecular analysis predicts disease status relatively directly. However, there are many abnormalities which show familial recurrence and have a clear genetic component, but do not show regular Mendelian segregation patterns. Defining the causative gene for non-Mendelian diseases is more difficult, and even when the underlying gene is known, there is uncertainty for prenatal prediction. However, detailed examination of the different mechanisms that underlie non-Mendelian segregation provides insight into the types of interaction that regulate more complex disease genetics.
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Mendelian inheritance patterns are well-established, and readily recognizable as ‘textbook’ examples, for many single gene diseases (), and a few digenic cases (–). However, in most clinical genetics settings many cases are seen where the disease diagnosed is well known to have a strong genetic component, and show some familial recurrence, but no clear Mendelian inheritance. Such cases clearly pose additional problems in counselling and the estimation of recurrence risk.
Here, we review some of the different molecular mechanisms that lead to such irregular inheritance patterns, focussing mostly on diseases where at least one implicated gene and some underlying mutations have been identified. It is useful to attempt to categorize the different ways in which the observed inheritance patterns are generated (Table ) and then to consider in more detail some examples in each category.
Some detailed molecular mechanisms underlying non-Mendelian inheritance patterns will be unfolded below, but first some general concepts need to be clarified. Incomplete penetrance (), where not all mutation carriers present with the expected phenotype, is commonly observed in human family studies. This forms a continuum with variable expressivity, which can be so extreme that subtle manifestations of carrier status are sometimes only identified with hindsight (). Even some of the most classical Mendelian traits, like cystic fibrosis (CF), show complex variation (,). A significant proportion of variability can be ascribed to allelic differences (,), some of which will be cryptic regulatory variation, influencing gene expression levels (,). The existence of widespread variation is not surprising, as gene products fulfil their function through finely tuned interactions with other cellular components, often showing some degree of threshold requirement (). Each component is subject to regulation, and variation, at every stage: transcription, splicing, translation (), protein folding, oligomerization, translocation and compartmentalization within the cell or export from it ().