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Genetics and Mitochondrial Abnormalities in Autism Spectrum Disorders: a Review

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Genetics and Mitochondrial Abnormalities in Autism Spectrum Disorders: a Review 322 Current Genomics, 2011, 12, 322-332 Genetics and Mitochondrial Abnormalities in Autism Spectrum Disorders: A Review Sukhbir Dhillon, Jessica A. Hellings and Merlin G. Butler* Departments of Psychiatry & Behavioral Sciences and Pediatrics, Kansas University Medical Center, Kansas City, Kansas 66160, USA Abstract: We review the current status of the role and function of the mitochondrial DNA (mtDNA) in the etiology of autism spectrum disorders (ASD) and the interaction of nuclear and mitochondrial genes. High lactate levels reported in about one in five children with ASD may indicate involvement of the mitochondria in energy metabolism and brain development. Mitochondrial disturbances include depletion, decreased quantity or mutations of mtDNA producing defects in biochemical reactions within the mitochondria. A subset of individuals with ASD manifests copy number variation or small DNA deletions/duplications, but fewer than 20 percent are diagnosed with a single gene condition such as fragile X syndrome. The remaining individuals with ASD have chromosomal abnormalities (e.g., 15q11-q13 duplications), other genetic or multigenic causes or epigenetic defects. Next generation DNA sequencing techniques will enable better characterization of genetic and molecular anomalies in ASD, including defects in the mitochondrial genome particularly in younger children. Received on: April 15, 2011 - Revised on: May 24, 2011 - Accepted on: May 25, 2011 Keywords: Autism spectrum disorders (ASD), mitochondrial DNA (mtDNA) mutations and depletion, oxidative stress, nuclear genes, lactate/pyruvate ratios, genetic causation. Leo Kanner described autism in 1943 in 11 children GENETIC CONTRIBUTIONS TO AUTISM SPECT- manifesting withdrawal from human contact as early as age RUM DISORDERS 1 year postulating origins in prenatal life [1]. The Diagnostic The etiology of ASD is complex and encompasses the and Statistical Manual of Mental Disorders IV-Text Revised (DSM-IV-TR) described autism as a complex roles of genes, the environment (epigenetics) and the mitochondria. Mitochondria are cellular organelles that neurobehavioral disorder characterized by deficiencies in function to control energy production necessary for brain social interaction, impaired communication skills and development and activity. Researchers are increasingly repetitive stereotypic behavior with onset prior to 3 years of identifying mitochondrial abnormalities in young children age [2]. Several conditions including full-syndrome autism with ASD since the most severe cases present early with (Autistic Disorder), Asperger Syndrome and Pervasive Developmental Disorder Not Otherwise Specified (PDD- features of ASD. Better awareness and more accurate and detailed genetic and biochemical testing are now available NOS) are now grouped as Autism Spectrum Disorders for the younger patient presenting with developmental delay (ASD) also known as Pervasive Developmental Disorders or behavioral problems. (PDDs) [2-4]. Epidemiologic and family studies suggest that genetic Symptoms of ASD usually begin in early childhood with evidence of delayed development before age 3 years. The risk factors are present. Monogenic causes are identifiable in less than 20 percent of subjects with ASD. The remaining American Academy of Pediatrics recommends autism subjects have other genetic or multigenic causes and/or screening for early identification and intervention by at least epigenetic influences which are environmental factors age 12 months and again at 24 months. Rating scales helpful altering gene expression without changing the DNA in establishing the diagnosis are Autism Diagnostic sequence [7-10]. Epigenetic factors in ASD have been Interview- Revised (ADI-R) and the Autism Diagnostic Observation Schedule (ADOS) in combination with clinical reviewed by Grafodatskaya et al. [11]. The recurrence risk for ASD varies by gender for the second child to be affected presentation [5, 6]. (4% if the first child affected is female and 7% if a male). The recurrence rate increases to 25-30% if the second child is also diagnosed with ASD. Studies have shown that among identical twins, if one child has ASD, then the other has a 60 *Address correspondence to this author at the Department of Psychiatry & to 95% chance of being affected. Behavioral Sciences, Kansas University Medical Center, 3901 Rainbow Fragile X syndrome and tuberous sclerosis are the most Boulevard, MS 4015, Kansas City, Kansas 66160, USA; Tel: (913) 588- 1873; Fax: (913) 588-1305; E-mail: [email protected] common single gene conditions associated with ASD. The commonest chromosomal abnormality in non-syndromal 1389-2029/11 $58.00+.00 ©2011 Bentham Science Publishers Ltd. Mitochondria and Autism Current Genomics, 2011, Vol. 12, No. 5 323 autism is duplication of the 15q11-q13 region, accounting genes encode neuronal cell-adhesion molecules. These for 5% of patients with autism. Large microdeletions in findings were replicated in two independent cohorts and chromosome 16p11.2 and 22q regions account for another demonstrate an association with susceptibility to ASD. 1% of cases [12]. The rapid rise in the incidence of ASD in Sebat et al. [23] studied 165 individuals with autism the past 30 years, apart from improved identification, points grouped into 118 simplex families without a family history to environmental factors acting on essentially unchanged of autism and 47 multiplex families with multiple affected genetic predispositions involving nuclear and mitochondrial siblings and compared them with control groups without DNA since de novo changes in genes are unlikely to occur so autism. They reported that 10.2% (12 of 118) of simplex quickly. Specific genetic and cytogenetic conditions families showed copy number variants (CNVs), 2.6% (2 of associated with ASD are summarized in a recent review [13]. 77) with CNVs in individuals with autism from multiplex The role and importance of genetic testing for individuals families and 1% (2 of 196) with CNVs among normally with ASD is well recognized [14] with various studies developing children. The majority of CNVs were of the showing yields of 6% to 40% with newer testing methods deletion type. Thus, CNVs were significantly more common [15, 16]. Early studies by Miles and Hillman [15] tested 94 in the sporadic form of autism than in those with a family children clinically diagnosed with ASD and found that 6 of history due to single gene mutations not detectable by DNA 94 (6%) had identifiable genetic disorders. Herman et al. deletion or duplication analysis. [17] later found genetic causes in 7 of 71 (10%) subjects As a result of research into nucleotide sequences, with ASD. Schaefer and Lutz [16] used a three- tier clinical microdeletions and duplications in children with ASD can genetic approach to identify causes in 32 clinically now be identified including syntaxin binding protein 5 diagnosed children with ASD, and reported positive genetic (STXBP5) and neuronal leucine rich repeat 1 (NLRR1) genes. findings in 13 subjects (40%). These included 5% with a Syntaxin 5 regulates synaptic transmission at the pre- high resolution chromosomal abnormality, 5% with fragile X synaptic cleft and is known to inhibit synapse formation. syndrome, 5% with Rett syndrome (MECP2 gene defects in Syntaxin 1 protein is increased in those with high females), 3% with PTEN gene mutations in those with a functioning autism. The role of NLRR1 at the synaptic level head circumference > 2.5 SD, approximately 10% with other is unknown but is thought to be related to neuronal growth genetic syndromes (e.g., tuberous sclerosis) and 10% with [24]. small deletions or duplications identified using chromosomal microarrays. An autism genome-wide copy number variation study reported by Glessner et al. [25] in a large cohort of ASD High resolution chromosome analysis detects 3 to 5 cases compared with controls showed that NRXN1 and megabase-sized abnormalities; however, new technology CNTN4 genes play a role. They also described new using DNA or chromosomal microarrays can identify susceptibility genes, NLGN1 and ASTN2 which encode abnormalities 100 times smaller. Therefore, microdeletions neuronal cell-adhesion molecules and other genes involved and duplications may now be identified with microarrays in in the ubiquitin pathways (UBE3A, PARK2, RFWD2 and individuals with ASD who previously had normal FBXO40), two important gene networks expressed in the cytogenetic testing. Children with ASD show a higher central nervous system. prevalence of microdeletions and duplications, particularly involving chromosome regions 1q24.2, 3p26.2, 4q34.2, Next generation DNA sequencing is currently underway, 6q24.3 and 7q35 including those with non-syndromal ASD allowing for rapid and efficient detection of mutations at the [18]. Therefore, if cytogenetic analysis is negative in nuclear and mitochondrial DNA (mtDNA) level in human clinically diagnosed ASD, testing for microdeletions and investigations and becoming part of clinical workup. duplications with newer techniques is warranted. Heteroplasmy or the existence of multiple mtDNA types within cells of an individual, is detectable using standard Shen and coworkers [19] studied genetic testing results molecular genetic techniques which focus on hypervariable from a cohort of 933 patients with ASD including G-banded regions of the mitochondrial genome. With high-throughput karyotypes, fragile X testing and chromosomal microarrays. next generation sequencing of the complete human mtDNA, They reported
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