Tic disorders: from pathophysiology to treatmentRampello, L.; Alvano, A.; Battaglia, G.; Bruno, V.; Raffaele, R.; Nicoletti, F.
doi: 10.1007/s00415-005-0008-8pmid: 16331353
Tic disorders are stereotypic behaviours,more frequent than once believed, and therefore likely to be encountered by primary care physicians. Tics usually begin in childhood and are the clinical hallmark of Tourette Syndrome (TS), the most common cause of tics. TS is a relatively common neurobehavioural disorder with a spectrum of manifestations that wax and wane during its natural course. The pathophysiology of tics, at molecular and cellular level, is still unknown,whereas structural and functional neuroimaging studies have shown the involvement of the basal ganglia and related cortico–striato–thalamo–cortical circuits, and the dopaminergic neuronal system. Moreover, TS has a strong genetic background. The management of TS is often complicated by the presence of attention–deficit/hyperactivity disorder, obsessivecompulsive disorder, and other behaviour disorders. The correct diagnosis is a fundamental step for a proper management of these disorders, and a multimodal treatment is usually indicated. This approach includes educational and supportive interventions, as well as pharmacological treatments when tics are at their worst.
SMN2 copy number predicts acute or chronic spinal muscular atrophy but does not account for intrafamilial variability in siblingsCuscó, I.; Barceló, M.; Rojas–García, R.; Illa, I.; Gámez, J.; Cervera, C.; Pou, A.; Izquierdo, G.; Baiget, M.; Tizzano, E.
doi: 10.1007/s00415-005-0912-ypmid: 15981080
Spinal muscular
atrophy (SMA) is an autosomal
recessive disorder that affects
motor neurons. It is caused by
mutations in the survival motor
neuron gene 1 (SMN1). The SMN2
gene, which is the highly homologous
SMN1 copy that is present in
all the patients, is unable to prevent
the disease. An SMN2 dosage
method was applied to 45 patients
with the three SMA types (I–III)
and to four pairs of siblings with
chronic SMA (II–III) and different
phenotypes. Our results confirm
that the SMN2 copy number plays a
key role in predicting acute or
chronic SMA. However, siblings
with different SMA phenotypes
show an identical SMN2 copy number
and identical markers, indicating
that the genetic background
around the SMA locus is insufficient
to account for the intrafamilial
variability. In our results, age of
onset appears to be the most important
predictor of disease severity
in affected members of the
same family.Given that SMN2 is
regarded as a target for potential
pharmacological therapies in SMA,
the identification of genetic factors
other than the SMN genes is necessary
to better understand the
pathogenesis of the disease in order
to implement additional therapeutic
approaches.
Long–term survival of Parkinson's diseaseD'Amelio, M.; Ragonese, P.; Morgante, L.; Reggio, A.; Callari, G.; Salemi, G.; Savettieri, G.
doi: 10.1007/s00415-005-0916-7pmid: 16021349
In a set of a population–
based study, long–term survival
of 59 prevalent PD patients
was compared with that of individuals
free of neurological diseases
matched 1:2 by sex and age of enrolment.
PD individuals, compared
with reference subjects, showed a
two–fold increased risk of death
(OR 2.1; 95 % CI 1.4, 3.1). Among
causes of death, pneumonia and
cachexia were significantly more
frequent among PD patients than
among individuals free of neurological
diseases. We confirmed in a
long–term follow–up study an increased
mortality among PD individuals
compared with that of the
general population.
Seasonal fluctuation of multiple sclerosis births in SardiniaSotgiu, Stefano; Pugliatti, M.; Sotgiu, M.; Fois, M.; Arru, G.; Sanna, A.; Rosati, G.
doi: 10.1007/s00415-005-0917-6pmid: 16021348
Study results from different
geographical areas provide
some circumstantial evidence that,
when compared with the general
population, people who later in life
develop multiple sclerosis (MS)
have a pattern of birth excess numbers
in spring and late summer,
which may disclose an association
with MS–predisposing environmental
agents. To identify the presence
of season–related cluster of
MS birth in Sardinia we have designed
a case–control study in the
province of Sassari, Northern Sardinia,
insular Italy, an area at veryhigh
and increasing risk for MS.
Mean birth incidence rate of people
with MS (810 cases) on a threeand
six–months basis were compared
with that of two control populations:
the MS unaffected siblings
(1069), sharing genetic material
with patients, and a representative
number of births (247,612) of the
general population of the study
area. We found that the birth in
months peaking in spring significantly
represents one risk factor for
future MS development. This seasonal
deviation of MS births reveals
an intriguing epidemiological
overlap with common environmental
agents, which may open a
new scenario of hypothetical explanations
for environmental factors
perhaps affecting the CNS at the
crucial time of myelination or
shaping the newborn immune system.