Genetic and phenotypic spectrum associated with IFIH1 gain-of-function

IFIH1 gain-of-function has been reported as a cause of a type I interferonopathy encompassing a spectrum of autoinflammatory phenotypes including Aicardi–Goutières syndrome and Singleton Merten syndrome. Ascertaining patients through a European and North American collaboration, we set out to describe the molecular, clinical and interferon status of a cohort of individuals with pathogenic heterozygous mutations in IFIH1. We identified 74 individuals from 51 families segregating a total of 27 likely pathogenic mutations in IFIH1. Ten adult individuals, 13.5% of all mutation carriers, were clinically asymptomatic (with seven of these aged over 50 years). All mutations were associated with enhanced type I interferon signaling, including six variants (22%) which were predicted as benign according to multiple in silico pathogenicity programs. The identified mutations cluster close to the ATP binding region of the protein. These data confirm variable expression and nonpenetrance as important characteristics of the IFIH1 genotype, a consistent association with enhanced type I interferon signaling, and a common mutational mechanism involving increased RNA binding affinity or decreased efficiency of ATP hydrolysis and filament disassembly rate

Mutations in DCC cause isolated agenesis of the corpus callosum with incomplete penetrance

Brain malformations involving the corpus callosum are common in children with developmental disabilities. We identified DCC mutations in four families and five sporadic individuals with isolated agenesis of the corpus callosum (ACC) without intellectual disability. DCC mutations result in variable dominant phenotypes with decreased penetrance, including mirror movements and ACC associated with a favorable developmental prognosis. Possible phenotypic modifiers include the type and location of mutation and the sex of the individual

Water Misallocation and Environmental Externalities in Electricity Generation

We explore the interactions between environmental externalities and intertemporal market power in electricity generation industries where thermal operators imperfectly compete with operators using scarce water stored in dams. Relying upon a two-period model, we show that, in countries where demand peaks at the first (resp.ly, second) period after water renewal, dynamic market power worsens (resp.ly, ameliorates) resource allocation and environmental health. We then address policy issues. We show that, in general, second best is not decentralized by means of standard tools such as price cap. We argue that the hydraulic process requires specific regulation. We put forward a quantity-based version of the contracts for price difference increasingly used in power pools, to be adopted jointly with either a flexible form of taxation or an intertemporal price cap

Regolamentazione Parziale di Quantità

Public utilities have recently undergone a major process of reorganization. Competitive segments have been liberalized, (eventually) privatised and tend to evolve into partially regulated oligopolies. In the latter, former monopolists are subject to regulatory duties whereas competitors operate unregulated, although endowed with market power. Having these scenarios in mind, we propose a mechanism of partial regulation that is suitable for private Cournot oligopolies. Iterated over time, this scheme, which relies upon data about current costs and past performance, converges to the equilibrium of a Nash-Cournot mixed oligopoly

Long-term contracting in hydro-thermal electricity generation: Welfare and environmental impact

We consider electricity generation industries where thermal operators imperfectly compete with hydro operators that manage a (scarce) water stock stored in reservoirs over a natural cycle. We explore how the exercise of intertemporal market power affects social welfare and environmental quality. We show that, as compared to the outcome of spot markets, long-term contracting either exacerbates or alleviates price distortions, depending upon the consumption pattern over the water cycle. Moreover, it induces a second-order environmental effect that, in the presence of a thermal competitive fringe, is critically related to the thermal market shares in the different periods of the cycle. We conclude by providing policy insights

Partial Regulation in Vertically Differentiated Industries

We provide theoretical foundations for quality-adjusted price-cap regulation in industries where a regulated incumbent and an unregulated entrant offer vertically differentiated products competing in price and quality. We show that, whether or not the incumbent anticipates the reaction of the entrant, the optimal weights in the cap depend upon the market served by the entrant, despite the latter not being directly concerned by regulation. We further show that the cap is robust to small errors in the weights. Our findings point to the conclusion that, in partially regulated industries, regulators should use information about the whole sectors rather than on the sole regulated incumbents