[Genetics of ADHD in clinical practice]. / Genética del TDAH en la práctica clínica.

Attention-deficit/hyperactivity disorder (ADHD) is a complex and heterogeneous neurodevelopmental disorder from a causal, clinical and prognostic perspective. Research reflects its multifactorial nature with a prominent role of genetic factors. Population studies have historically pointed to the involvement of numerous genetic variants of small effect size, which hardly by themselves increase the risk of presenting the disorder and hardly justify its high heritability. Many of them are present in more than 60% of the general population, suggesting their modulatory rather than causal role. However, after the irruption of new genetic techniques in the last 15 years, a greater number of cases are being identified with genetic disorders (many of them monogenic), whose genetic variants alone explain the presence of ADHD. A detailed study of the personal and family history, as well as a complete physical examination, can help to identify some of them. The identification of the cause in this group of cases has a crucial value in clinical counseling, genetic-familial counseling and prognostic anticipation, as well as in the performance or avoidance of complementary studies and in the design of the intervention plan.

El trastorno por déficit de atención/hiperactividad (TDAH) es un trastorno del neurodesarrollo complejo y heterogéneo desde una perspectiva causal, clínica y pronóstica. La investigación refleja su carácter multifactorial con un papel destacado de los factores genéticos. Los estudios poblacionales han señalado históricamente la implicación de numerosas variantes genéticas de escaso tamaño de efecto, las cuales por sí mismas apenas incrementan el riesgo de TDAH y difícilmente justifican su elevada heredabilidad. Muchas de ellas están presentes en más del 60% de la población general, lo que sugiere su papel modulador más que causal. No obstante, gracias a la irrupción de nuevas técnicas genéticas en los últimos 15 años, se están identificando un mayor número de casos con trastornos genéticos (muchos de ellos monogénicos), cuyas variantes genéticas explican por sí mismas la presencia del TDAH. El estudio detallado de los antecedentes personales y familiares, así como una exploración física completa, puede ayudar a identificar algunos de ellos. La identificación de la causa en este conjunto de casos tiene un valor crucial en el asesoramiento clínico, el consejo genético-familiar y la anticipación pronóstica, así como en la realización o evitación de estudios complementarios y en el diseño del plan terapéutico.

Tatton-Brown-Rahman syndrome: Novel pathogenic variants and new neuroimaging findings.

Tatton-Brown-Rahman syndrome (TBRS) or DNMT3A-overgrowth syndrome is characterized by overgrowth and intellectual disability associated with minor dysmorphic features, obesity, and behavioral problems. It is caused by variants of the DNMT3A gene. We report four patients with this syndrome due to de novo DNMT3A pathogenic variants, contributing to a deeper understanding of the genetic basis and pathophysiology of this autosomal dominant syndrome. Clinical and magnetic resonance imaging assessments were also performed. All patients showed corpus callosum anomalies, small posterior fossa, and a deep left Sylvian fissure; as well as asymmetry of the uncinate and arcuate fascicles and marked increased cortical thickness. These results suggest that structural neuroimaging anomalies have been previously overlooked, where corpus callosum and brain tract alterations might be unrecognized neuroimaging traits of TBRS syndrome caused by DNMT3A variants.

El impacto del TDAH sobre la lectura / The impact of ADHD on reading

Resumen Más allá de la frecuente coexistencia del trastorno por déficit de atención con hiperactividad (TDAH) y el trastorno específico del aprendizaje de la lectura, la presente revisión pretende examinar la evidencia empírica disponible sobre cómo el TDAH impacta negativamente sobre el aprendizaje de la lectura. Los datos existentes apuntan a que la presencia del trastorno (especialmente los síntomas de falta de atención), puede afectar a i) la correcta adquisición de lectura, ya sea de manera directa o a través de su influencia sobre los precursores de la lectura; ii) las propias habilidades de decodificación (precisión y fluidez lectora), tanto de manera directa como indirecta a través de su influencia sobre procesos cognitivos como la distracción o las funciones ejecutivas; y ii) la comprensión lectora, probablemente de manera indirecta por las dificultades eje cutivas y en la memoria de trabajo verbal características del TDAH. Estas conclusiones presentan importantes implicaciones para caracterizar e intervenir mejor sobre las dificultades lectoras en el TDAH, ya sean clínicas o subclínicas.

Abstract Beyond the frequent coexistence of attention deficit hyperactivity disorder (ADHD) and reading dis order (dyslexia), the present review aims to examine the available empirical evidence on how ADHD negatively impacts on learning to read. Existing data suggest that the presence of the disorder (especially inattention symp toms), may affect i) the correct acquisition of reading, either directly or through its influence on the precursors to reading; ii) decoding skills themselves (reading accuracy and fluency), both directly and indirectly through its influence on cognitive processes such as distractibility or executive functions; and iii) reading comprehension, probably indirectly through the executive and verbal memory difficulties characteristic of ADHD. These findings have important implications for better characterizing and intervening on reading difficulties in ADHD, whether clinical or subclinical.

Síndrome cerebeloso cognitivo afectivo tras cerebelitis aguda / Cerebellar cognitive affective syndrome after acute cerebellitis

En el síndrome cerebeloso, cuya causa principal es la cerebelitis aguda, destacan principalmente las alteraciones motoras, si bien no son las únicas consecuencias de esta patología. Los pacientes que se presentan a continuación manifiestan, además de los signos motores, alteraciones cognitivo-afectivas, como déficit de atención, cambios de personalidad, etc. Esto se denomina síndrome cerebeloso cognitivo afectivo, cuyo diagnóstico es poco habitual a pesar de ser una complicación común. Estos casos llaman a reflexionar sobre la importancia de diagnosticar dicho síndrome para poder administrar un tratamiento adecuado y así mejorar la calidad de vida de los pacientes que lo padezcan (AU)

The most common cause of the cerebellar syndrome is acute cerebellitis. The motor disorders stand out in this syndrome. However, there are other symptoms apart from these. The patients presented below show, besides motor disorders, cognitive affective signs such as attention deficit, personality changes, etc. All these latter manifestations form the cerebellar cognitive affective syndrome. Despite having an uncommon diagnosis, it is a frequent complication. These cases prove the importance of diagnosing this syndrome to enhance the patient’s life quality by providing adequate treatment. (AU)

[The impact of ADHD on reading]. / El impacto del TDAH sobre la lectura.

Beyond the frequent coexistence of attention deficit hyperactivity disorder (ADHD) and reading disorder (dyslexia), the present review aims to examine the available empirical evidence on how ADHD negatively impacts on learning to read. Existing data suggest that the presence of the disorder (especially inattention symptoms), may affect i) the correct acquisition of reading, either directly or through its influence on the precursors to reading; ii) decoding skills themselves (reading accuracy and fluency), both directly and indirectly through its influence on cognitive processes such as distractibility or executive functions; and iii) reading comprehension, probably indirectly through the executive and verbal memory difficulties characteristic of ADHD. These findings have important implications for better characterizing and intervening on reading difficulties in ADHD, whether clinical or subclinical.

Más allá de la frecuente coexistencia del trastorno por déficit de atención con hiperactividad (TDAH) y el trastorno específico del aprendizaje de la lectura, la presente revisión pretende examinar la evidencia empírica disponible sobre cómo el TDAH impacta negativamente sobre el aprendizaje de la lectura. Los datos existentes apuntan a que la presencia del trastorno (especialmente los síntomas de falta de atención), puede afectar a i) la correcta adquisición de lectura, ya sea de manera directa o a través de su influencia sobre los precursores de la lectura; ii) las propias habilidades de decodificación (precisión y fluidez lectora), tanto de manera directa como indirecta a través de su influencia sobre procesos cognitivos como la distracción o las funciones ejecutivas; y ii) la comprensión lectora, probablemente de manera indirecta por las dificultades ejecutivas y en la memoria de trabajo verbal características del TDAH. Estas conclusiones presentan importantes implicaciones para caracterizar e intervenir mejor sobre las dificultades lectoras en el TDAH, ya sean clínicas o subclínicas.

Bi-Allelic c.1746G>T; p.Leu582= Variants in TUBGCP4 in a Boy with Autism: Clinical Data and Literature Review.

Bi-allelic mutations in the TUBGCP4 gene have been recently associated with autosomal recessive microcephaly with chorioretinopathy. However, little is known about the genotype-phenotype characteristics of this disorder. Here, we describe a 5-year-old male patient with autism and a normal occipitofrontal circumference. No retinal abnormalities were observed. Brain MRI revealed the presence of enlarged sheaths of both tortuous optic nerves; both eyes had shorter axial lengths. Whole-exome sequencing in trio revealed synonymous TUBGCP4 variants in homozygous state: c.1746G>T; p.Leu582=. This synonymous variant has been previously described and probably leads to skipping of exon 16 of TUBGCP4. These results broaden the clinical spectrum of this new syndrome and suggest that TUBGCP4 bi-allelic mutations may underlie complex neurodevelopmental disorders.

Biallelic ELMO3 mutations and loss of function for DOCK-mediated RAC1 activation result in intellectual disability.

The engulfment and cell motility 3 (ELMO3) protein belongs to the ELMO-family of proteins. ELMO proteins form a tight complex with the DOCK1-5 guanine nucleotide exchange factors that regulate RAC1 spatiotemporal activation and signalling. DOCK proteins and RAC1 are known to have fundamental roles in central nervous system development. Here, we searched for homozygous or compound heterozygous mutations in the ELMO3 gene in 390 whole exomes sequenced in trio in individuals with neurodevelopmental disorders compatible with a genetic origin. We found a compound heterozygous mutation in ELMO3 (c.1153A>T, p.Ser385Cys and c.1009 G > A, p.Val337Ile) in a 5 year old male child with autism spectrum disorder (ASD) and developmental delay. These mutations did not interfere with the formation of an ELMO3/DOCK1 complex, but markedly impaired the ability of the complex to promote RAC1-GTP-loading. Consequently, cells expressing DOCK1 and either of the ELMO3 mutants displayed impaired migration and invasion. Collectively, our results suggest that biallelic loss-of-function mutations in ELMO3 may cause a developmental delay and provide new insight into the role of ELMO3 in neurodevelopmental as well as the pathological consequences of ELMO3 mutations.

A mild clinical and neuropsychological phenotype of Renpenning syndrome: A new case report with a maternally inherited PQBP1 missense mutation.

Mutations in the PQBP1 gene are associated with Renpenning syndrome (RENS1, MIM# 309500). Most cases are characterized by intellectual disability, but a detailed neuropsychological profile has not yet been established. The present case study of a 8.5 years-old male child with a missense novel mutation in the PQBP1 gene expands existing understanding of this syndrome by presenting a milder clinical and neuropsychological phenotype. Whole exome trio analysis sequencing revealed a maternally inherited PQBP1 missense mutation in chromosome X [NM_001032383.1, c.727C > T (p.Arg243Trp)]. Variant functional studies demonstrated a significant reduction in the interaction between PQBP1 and the component of the nuclear pre-mRNA splicing machinery, U5-15KD. A comprehensive neuropsychological assessment revealed marked deficits in processing speed, attention and executive functioning (including planning, inhibitory control and working memory) without intellectual disability. Several components of language processing were also impaired. These results support that this mutation partially disrupts the function of this gene, which is known to play critical roles in embryonic and neural development. As most of the genomic PQBP1 abnormalities associated with intellectual disability have been found to be loss-of-function mutations, we hypothesize that a partial loss-of-function of this variant is associated with a mild behavioral and neuropsychological phenotype.

Abnormal frontal gyrification pattern and uncinate development in patients with KBG syndrome caused by ANKRD11 aberrations.

KBG syndrome is characterized by dental, craniofacial and skeletal anomalies, short stature and global developmental delay or intellectual disability. It is caused by microdeletions or truncating mutations of ANKRD11. We report four unrelated probands with this syndrome due to de novo ANKRD11 aberrations that may contribute to a better understanding of the genetics and pathophysiology of this autosomal dominant syndrome. Clinical, cognitive and MRI assessments were performed. Three of the patients showed normal intellectual functioning, whereas the fourth had a borderline level of intellectual functioning. However, all of them showed deficits in various cognitive and socioemotional processes such as attention, executive functions, empathy or pragmatic language. Moreover, all probands displayed marked asymmetry of the uncinate fascicles and an abnormal gyrification pattern in the left frontal lobe. Thus, structural neuroimaging anomalies seem to have been overlooked in this syndrome. Disturbed frontal gyrification and/or lower structural integrity of the uncinate fascisulus might be unrecognized neuroimaging features of KBG syndrome caused by ANKRD11 aberrations. Present results also point out that this syndrome is not necessarily associated with global developmental delay and intellectual disability, but it can be related to other neurodevelopmental disorders or subclinical levels of attention-deficit hyperactivity disorder, autism, communication disorders or specific learning disabilities.

ANO3 and early-onset dyskinetic encephalopathy.

Mutations in the ANO3 gene have been associated with autosomal dominant craniocervical dystonia. However, little else is known about the genotype-phenotype characteristics of this disorder. Here we describe a 3 years-old girl with distal myoclonic dystonia. Whole exome sequencing in trio revealed a de novo missense ANO3 variant not previously described in international databases. A global psychomotor regression was observed once dystonia was present. Brain MRI changes paralleled these findings: whereas MRI at the age of 18 months was normal, mild brain and cerebellar atrophy was observed 18 months later. These results suggest that missense mutations in ANO3 may underlie complex disorders particularly characterized by early psychomotor regression and dystonia.

Attention-deficit/hyperactivity disorder and lifestyle habits in children and adolescents.

INTRODUCTION: Attention-deficit/hyperactivity disorder (ADHD) is one of the most prevalent disorders in the child and adolescent population, with a known impact on learning, social relations and quality of life. However, the lifestyle habits of patients with this disorder have been poorly studied. MATERIAL AND METHODS: A total of 160 children and adolescents, aged between 6 and 16 years, participated in the study. Half of them were treatment-naïve patients with a clinical diagnosis of ADHD according to DSM-IV-TR criteria, and without comorbidities. The remaining 80 participants were typically developing (TD) controls without known neurodevelopmental or psychiatric disorders. Parents of all participants completed a questionnaire about their children´s lifestyle habits (e.g, daily hours of sleep, media use and study). RESULTS: The groups had a similar socioeconomic background and did not differ with respect to age and sex distribution. However, patients with ADHD spent more time than TD children studying, and less time watching TV, playing video games, using computers and playing with other people. They also slept fewer hours per night than children and adolescents with TD. ADHD and TD groups spent similar time reading, listening to music and playing sports. CONCLUSIONS: The results of this study suggest that children and adolescents with ADHD have different lifestyle habits compared to age- and sex-matched controls. These findings are not explained by comorbid disorders or medication/ psychological treatment.

Trastorno por déficit de atención/ hiperactividad y hábitos de vida en niños y adolescentes / Attention-deficit/hyperactivity disorder and lifestyle habits in children and adolescents

Introducción. El trastorno por déficit de atención/hiperactividad (TDAH) es uno de los trastornos más prevalentes en la población infanto-juvenil con un impacto ya conocido sobre el aprendizaje, la relación social y la calidad de vida. Sin embargo, los hábitos de vida de los pacientes con este trastorno han sido pobremente estudiados. Material y métodos. Un total de ciento sesenta niños y adolescentes con edades comprendidas entre los 6 y los 16 años (104 varones y 56 mujeres) participaron en este estudio. La mitad de ellos tenían un diagnóstico de TDAH de acuerdo a los criterios del DSM-IV-TR; eran pacientes sin tratamiento y sin comorbilidades. El grupo control estaba formado por 80 niños y adolescentes sin trastornos del neurodesarrollo o psiquiátricos conocidos. Las familias completaron un cuestionario sobre los hábitos de vida de sus hijos e hijas (dedicación extraescolar -horas al día- a diferentes actividades durante la semana lectiva). Resultados. Los grupos tenían un nivel socioeconómico similar y no diferían en edad y sexo. Sin embargo, los pacientes con TDAH dedicaban más tiempo al estudio que los controles y menos a actividades como la TV, el ordenador, los videojuegos y el juego con otras personas. Además, los pacientes con TDAH dormían menos horas diarias que los controles. No se observaron diferencias entre los grupos en el tiempo dedicado a la lectura, el deporte o la música. Conclusiones. Los resultados del presente estudio sugieren que los niños y adolescentes con TDAH tienen hábitos de vida diferentes a los niños y adolescentes con desarrollo típico. Estos hallazgos no se explican por la presencia de trastornos comórbidos o por el tratamiento farmacológico o psicológico

Introduction. Attention-deficit/hyperactivity disorder (ADHD) is one of the most prevalent disorders in the child and adolescent population, with a known impact on learning, social relations and quality of life. However, the lifestyle habits of patients with this disorder have been poorly studied. Material and methods. A total of 160 children and adolescents, aged between 6 and 16 years, participated in the study. Half of them were treatment-naïve patients with a clinical diagnosis of ADHD according to DSM-IV-TR criteria, and without comorbidities. The remaining 80 participants were typically developing (TD) controls without known neurodevelopmental or psychiatric disorders. Parents of all participants completed a questionnaire about their children's lifestyle habits (e.g, daily hours of sleep, media use and study). Results. The groups had a similar socioeconomic back-ground and did not differ with respect to age and sex distribution. However, patients with ADHD spent more time than TD children studying, and less time watching TV, playing video games, using computers and playing with other people. They also slept fewer hours per night than children and adolescents with TD. ADHD and TD groups spent similar time reading, listening to music and playing sports

Cingulate Cortical Thickness and Dopamine Transporter ( DAT1) Genotype in Children and Adolescents With ADHD.

OBJECTIVE: This study aimed to examine the influence of dopamine transporter gene ( DAT1) 3'UTR genotype on cingulate cortical thickness in a large sample of children and adolescents with ADHD. METHOD: Brain MRIs were acquired from 46 ADHD patients with homozygosity for the 10-repeat allele and 52 ADHD patients with a single copy or no copy of the allele. The cingulate cortex of each MRI scan was automatically parceled into sulci and gyri as well as into Brodmann areas (BA). RESULTS: There were no group differences in age, gender, full-scale intelligence quotient, symptom severity, treatment status, comorbidity, or mean overall cortical thickness. Sulcus/gyrus- and BA-based analyses revealed that patients homozygous for the 10-repeat allele showed significantly greater thickness in right cingulate gyrus and right BA 24 compared with 9-repeat carriers. CONCLUSION: These findings suggest that thickness of cingulate cortex is influenced by the presence of the 10-repeat allele in ADHD.

Migraña hemipléjica y secuencia pseudocontinuous arterial spin-labeling / Hemiplegic migraine and arterial spin labelling sequence

No disponible

Trastorno por déficit de atención/hiperactividad: perspectiva desde el neurodesarrollo / Attention deficit hyperactivity disorder: from a neurodevelopmental perspective

Introducción. Los trastornos del neurodesarrollo engloban a un grupo heterogéneo de trastornos como la discapacidad intelectual, el trastorno del espectro autista o los trastornos específicos del aprendizaje, entre otros. La reciente inclusión en las clasificaciones internacionales del trastorno por déficit de atención/hiperactividad (TDAH) dentro de los trastornos del neurodesarrollo parece claramente justificada atendiendo a variables neurobiológicas y clínicas. Desarrollo. El carácter dimensional y la distribución de diferentes síntomas en la población caracterizan a la mayoría de los trastornos del neurodesarrollo. Se revisan estos aspectos, particularmente desde la sintomatología y neuropsicología en el TDAH. El carácter sintomático dimensional del TDAH contrasta con los criterios diagnósticos de este trastorno de acuerdo a diferentes clasificaciones o guías clínicas. Contrasta igualmente con los datos recogidos a través de diferentes exploraciones complementarias (escalas, tests...). Conclusiones. El entendimiento del continuo clínico dentro de cada trastorno del neurodesarrollo (incluido el TDAH), entre los diferentes trastornos del neurodesarrollo, y entre los trastornos del neurodesarrollo y la normalidad, es esencial para la investigación, el diagnóstico y el abordaje de todos ellos. El desarrollo de instrumentos que avalen este componente dimensional es igualmente trascendental (AU)

Introduction. Neurodevelopmental disorders cover a heterogeneous group of disorders such as intellectual disability, autism spectrum disorders or specific learning difficulties, among others. The neurobiological and clinical variables seem to clearly justify the recent inclusion of attention deficit hyperactivity disorder (ADHD) as a neurodevelopmental disorder in the international classifications. Development. Neurodevelopmental disorders are characterised by their dimensional nature and the distribution of the different symptoms in the population. These aspects are reviewed, specifically from the perspective of the clinical features and the neuropsychology of ADHD. The dimensional symptomatic nature of ADHD contrasts with the diagnostic criteria of this disorder according to different classifications or clinical guidelines. It also contrasts with the data collected by means of different complementary examinations (scales, tests, etc.). Conclusions. It is essential to understand the clinical continuum within each neurodevelopmental disorder (including ADHD), among the different neurodevelopmental disorders, and among the neurodevelopmental disorders and normality for their research, diagnosis and management. The development of instruments that provide support for this dimensional component is equally significant (AU)

Actualización en el tratamiento farmacológico del trastorno por déficit de atención/hiperactividad: lisdexanfetamina y guanfacina de liberación retardada / An update on the pharmacological treatment of attention deficit hyperactivity disorder: lisdexamphetamine and extended-release guanfacine

Introducción. El trastorno por déficit de atención/hiperactividad (TDAH) es uno de los trastornos del neurodesarrollo más frecuentes en la población infantil. Su tratamiento es complejo y debe incluir medidas psicoeducativas, ambientales y farmacológicas. En los últimos años, las principales novedades respecto a su tratamiento farmacológico son la aparición de la lisdexanfetamina y la guanfacina de liberación retardada. Objetivo. El aumento del número de fármacos disponibles para el tratamiento del TDAH permite tratar y cubrir situaciones clínicas muy diversas. El propósito de la presente revisión es realizar un análisis de la bibliografía sobre ambos fármacos. Desarrollo: Se establecen los puntos fuertes de ambos tratamientos, atendiendo especialmente a su mecanismo de acción, a su tolerabilidad y a su eficacia. Conclusiones. La guanfacina de liberación retardada permite tratar situaciones escasamente cubiertas con los estimulantes, tales como los niños con irritabilidad y tics, con un perfil significativo de moderada eficacia y una buena tolerabilidad y seguridad. La aparición de la lisdexanfetamina ha supuesto un cambio muy importante porque, según la bibliografía, se trataría de un fármaco completo y efectivo, desde el punto de vista clínico, para mejorar los síntomas del TDAH. Además, posee un buen perfil de seguridad (AU)

Introduction. Attention deficit hyperactivity disorder (ADHD) is one of the most frequent neurodevelopmental disorders in the child population. Its treatment is complex and must include psychoeducational, environmental and pharmacological measures. In recent years, the main novelties as regards its pharmacological treatment have been the appearance of lisdexamphetamine and extended-release guanfacine. Aims. The increase in the number of drugs available for the treatment of ADHD makes it possible to treat and cover a very wide range of different clinical situations. The purpose of this review is to perform an analysis of the literature on the two drugs. Development. The study determines the strong points of both treatments, with special attention given to their mechanism of action, their tolerability and their efficacy. Conclusions. Extended-release guanfacine enables the professional to treat situations that are poorly covered by stimulants, such as children with irritability and tics, with a significant profile characterised by moderate efficacy and good tolerability and safety. The appearance of lisdexamphetamine has brought about a very important change because, according to the literature, it is a drug that, from the clinical point of view, is both complete and effective in improving the symptoms of ADHD. Moreover, it has a good safety profile (AU)

Neuroanatomía del trastorno por déficit de atención/hiperactividad: correlatos neuropsicológicos y clínicos / The neuroanatomy of attention deficit hyperactivity disorder: neuropsychological and clinical correlates

Introducción. El desarrollo de la resonancia magnética estructural y de nuevos métodos de análisis ha permitido examinar, como nunca antes, las bases neuroanatómicas del trastorno por déficit de atención/hiperactividad (TDAH). No obstante, poco se sabe todavía sobre la relación de los síntomas clínicos y las disfunciones neuropsicológicas características del TDAH con las alteraciones neuroanatómicas observadas. Objetivo. Explorar la relación entre neuroanatomía, clínica y neuropsicología en el TDAH. Desarrollo. A nivel de grupo, existen diferencias marcadas entre el cerebro de niños adolescentes y adultos con TDAH y el cerebro de personas con desarrollo típico. Estas diferencias se observan transversal y longitudinalmente en todas las medidas, tanto de la sustancia gris como de la sustancia blanca. Aunque todavía escasa, cada vez existe mayor evidencia que señala que estas diferencias se relacionan con los síntomas nucleares del trastorno y con el grado de disfunción clínica. También parecen asociarse con el funcionamiento cognitivo (principalmente, atención y control inhibitorio). Conclusiones. La relación entre los distintos niveles de análisis de estudio del TDAH acerca la investigación a la clínica y permite comprender y tratar mejor el trastorno. Aunque el avance en este campo es innegable, todavía son muchas las cuestiones que hay que explorar y profundizar en mayor detalle. Se requiere comprender mejor la asociación entre las medidas neuroanatómicas y cada dimensión sintomatológica, y la relación con otros procesos neuropsicológicos también implicados en el trastorno (AU)

Introduction. The development of structural magnetic resonance scanning and new methods of analysis has made it possible to explore, in a hitherto unknown way, the neuroanatomical bases of attention deficit hyperactivity disorder (ADHD). Yet, little is known about the relation between the clinical symptoms and the neuropsychological dysfunctions characterising ADHD and the neuroanatomical alterations that are observed. Aim. To explore the relation between neuroanatomy, clinical features and neuropsychology in ADHD. Development. At group level, there are a number of marked differences between the brain of children, adolescents and adults with ADHD and the brain of subjects with a typical development. These differences are observed cross-sectionally and longitudinally in all the measurements, both in the grey matter and in the white matter. Although still scarce, there is an increasing body of evidence showing that these differences are related with the core symptoms of the disorder and with the degree of clinical dysfunction. They also appear to be associated with cognitive functioning (mainly attention and inhibitory control). Conclusions. The relation among the different levels of analysis in the study of ADHD bring research closer to the clinical features and allows a better understanding and management of the disorder. Although progress is undoubtedly being made in this field, there are still many questions that need exploring in greater depth. There is a need for a better understanding of the association between the neuroanatomical measurements and each dimension of the symptoms, and their relationship with other neuropsychological processes that are also involved in the disorder (AU)

Mutations in BRAT1 cause autosomal recessive progressive encephalopathy: Report of a Spanish patient.

We describe a 4-year-old male child born to non-consanguineous Spanish parents with progressive encephalopathy (PE), microcephaly, and hypertonia. Whole exome sequencing revealed compound heterozygous BRAT1 mutations [c.1564G > A (p.Glu522Lys) and c.638dup (p.Val214Glyfs*189)]. Homozygous and compound heterozygous BRAT1 mutations have been described in patients with lethal neonatal rigidity and multifocal seizure syndrome (MIM# 614498). The seven previously described patients suffered from uncontrolled seizures, and all of those patients died in their first months of life. BRAT1 acts as a regulator of cellular proliferation and migration and is required for mitochondrial function. The loss of these functions may explain the cerebral atrophy observed in this case of PE. This case highlights the extraordinary potential of next generation technologies for the diagnosis of rare genetic diseases, including PE. Making a prompt diagnosis of PE is important for genetic counseling and disease management.

Cortical thickness differences in the prefrontal cortex in children and adolescents with ADHD in relation to dopamine transporter (DAT1) genotype.

Several lines of evidence suggest that the dopamine transporter gene (DAT1) plays a crucial role in attention deficit hyperactivity disorder (ADHD). Concretely, recent data indicate that the 10-repeat (10R) DAT1 allele may mediate neuropsychological functioning, response to methylphenidate, and even brain function and structure in children with ADHD. This study aimed to investigate the influence of 10R DAT1 on thickness of the prefrontal cortex in children and adolescents with ADHD. To this end, brain magnetic resonance images were acquired from 33 patients with homozygosity for the 10R allele and 30 patients with a single copy or no copy of the allele. The prefrontal cortex of each MRI scan was automatically parceled into regions of interest (ROIs) based on Brodmann areas (BA). The two groups were matched for age, gender, IQ, ADHD subtype, symptom severity, comorbidity and medication status. However, patients with two copies of the 10R allele exhibited significantly decreased cortical thickness in right BA 46 relative to patients with one or fewer copies of the allele. No other prefrontal ROI differed significantly between the two groups. Present findings suggest that cortical thickness of right lateral prefrontal cortex (BA 46) is influenced by the presence of the DAT1 10 repeat allele in children and adolescents with ADHD.