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1.

Autism

Autism is a neurodevelopmental disorder characterized by impaired social interaction and communication, and by restricted and repetitive behavior. Autism begins in childhood. It is marked by the presence of markedly abnormal or impaired development in social interaction and communication and a markedly restricted repertoire of activity and interest. Manifestations of the disorder vary greatly depending on the developmental level and chronological age of the individual (DSM-IV). [from HPO]

MedGen UID:
504569
Concept ID:
CN000674
Finding
2.

Autism spectrum disorders

Autism spectrum disorder (ASD) is a condition that appears very early in childhood development, varies in severity, and is characterized by impaired social skills, communication problems, and repetitive behaviors. These difficulties can interfere with affected individuals' ability to function in social, academic, and employment settings. People with ASD also have an increased risk of psychiatric problems such as anxiety, depression, obsessive-compulsive disorder, and eating disorders.From as early as 1 to 2 years of age, people with ASD have an impaired ability to interact with other people; they are often more comfortable dealing with objects. Affected individuals have difficulty understanding and using non-verbal social cues such as eye contact, facial expressions, gestures, and body language. Inability to recognize and use these cues makes it hard for affected individuals to understand the feelings of others or communicate their own feelings appropriately. Behavioral signs of ASD, such as reduced eye contact and social interaction, can sometimes be detected before age 2. However, the condition is usually diagnosed between ages 2 and 4, when more advanced communication and social skills, such as learning to play with others, typically begin to develop.Repetitive behaviors in ASD can include simple actions such as rocking, hand-flapping, or repetition of words or noises (echolalia). Affected individuals often dwell on or repeatedly express particular thoughts; this behavior is called perseveration. People with ASD tend to be rigid about their established routines and may strongly resist disruptions such as changes in schedule. They may also have difficulty tolerating sensory stimuli such as loud noises or bright lights.While social and communication difficulties and unusual behaviors define ASD, affected individuals can have a wide range of intellectual abilities and language skills. A majority of people with ASD have mild to moderate intellectual disability, while others have average to above-average intelligence. Some have particular cognitive abilities that greatly surpass their overall level of functioning, often in areas such as music, mathematics, or memory.Some people with ASD do not speak at all, while others use language fluently. However, fluent speakers with ASD often have problems associated with verbal communication. They might speak in a monotone voice, have unusual vocal mannerisms, or choose unusual topics of conversation.Several diagnoses that used to be classified as separate conditions are now grouped together under the diagnosis of ASD. For example, autistic disorder was a term that was used when affected individuals had limited or absent verbal communication, often in combination with intellectual disability. By contrast, Asperger syndrome was a diagnosis formerly applied to affected individuals of average or above-average intelligence who were not delayed in their language development. The broader diagnosis of ASD was established because many affected individuals fall outside of the strict definitions of the narrower diagnoses, and their intellectual and communication abilities may change over time. However, some individuals who were previously diagnosed with one of the subtypes now do not meet all the criteria of the new umbrella diagnosis. [from GTR]

MedGen UID:
307153
Concept ID:
C1510586
Mental or Behavioral Dysfunction
3.

Autistic disorder of childhood onset

Autism, the prototypic pervasive developmental disorder (PDD), is usually apparent by 3 years of age. It is characterized by a triad of limited or absent verbal communication, a lack of reciprocal social interaction or responsiveness, and restricted, stereotypic, and ritualized patterns of interests and behavior (Bailey et al., 1996; Risch et al., 1999). 'Autism spectrum disorder,' sometimes referred to as ASD, is a broader phenotype encompassing the less severe disorders Asperger syndrome (see ASPG1; 608638) and pervasive developmental disorder, not otherwise specified (PDD-NOS). 'Broad autism phenotype' includes individuals with some symptoms of autism, but who do not meet the full criteria for autism or other disorders. Mental retardation coexists in approximately two-thirds of individuals with ASD, except for Asperger syndrome, in which mental retardation is conspicuously absent (Jones et al., 2008). Genetic studies in autism often include family members with these less stringent diagnoses (Schellenberg et al., 2006). Levy et al. (2009) provided a general review of autism and autism spectrum disorder, including epidemiology, characteristics of the disorder, diagnosis, neurobiologic hypotheses for the etiology, genetics, and treatment options. Genetic Heterogeneity of Autism Autism is considered to be a complex multifactorial disorder involving many genes. Accordingly, several loci have been identified, some or all of which may contribute to the phenotype. Included in this entry is AUTS1, which has been mapped to chromosome 7q22. Other susceptibility loci include AUTS3 (608049), which maps to chromosome 13q14; AUTS4 (608636), which maps to chromosome 15q11; AUTS5 (606053), which maps to chromosome 2q; AUTS6 (609378), which maps to chromosome 17q11; AUTS7 (610676), which maps to chromosome 17q21; AUTS8 (607373), which maps to chromosome 3q25-q27; AUTS9 (611015), which maps to chromosome 7q31; AUTS10 (611016), which maps to chromosome 7q36; AUTS11 (610836), which maps to chromosome 1q41; AUTS12 (610838), which maps to chromosome 21p13-q11; AUTS13 (610908), which maps to chromosome 12q14; AUTS14A (611913), which has been found in patients with a deletion of a region of 16p11.2; AUTS14B (614671), which has been found in patients with a duplication of a region of 16p11.2; AUTS15 (612100), associated with mutation in the CNTNAP2 gene (604569) on chromosome 7q35-q36; AUTS16 (613410), associated with mutation in the SLC9A9 gene (608396) on chromosome 3q24; AUTS17 (613436), associated with mutation in the SHANK2 gene (603290) on chromosome 11q13; and AUTS18 (615032), associated with mutation in the CHD8 gene (610528). (NOTE: the symbol 'AUTS2' has been used to refer to a gene on chromosome 7q11 (KIAA0442; 607270) and therefore is not used as a part of this autism locus series.) There are several X-linked forms of autism susceptibility: AUTSX1 (300425), associated with mutations in the NLGN3 gene (300336); AUTSX2 (300495), associated with mutations in NLGN4 (300427); AUTSX3 (300496), associated with mutations in MECP2 (300005); AUTSX4 (300830), associated with variation in the region on chromosome Xp22.11 containing the PTCHD1 gene (300828); AUTSX5 (300847), associated with mutations in the RPL10 gene (312173); and AUTSX6 (300872), associated with mutation in the TMLHE gene (300777). Folstein and Rosen-Sheidley (2001) reviewed the genetics of autism. [from GTR]

MedGen UID:
13966
Concept ID:
C0004352
Mental or Behavioral Dysfunction
4.

Episodic

Applied to a sign, symptom, or other manifestation that occurs at least twice and potentially multiple times but separated by an interval in whichthe sign, symptom, or manifestation is not present. [from HPO]

MedGen UID:
910017
Concept ID:
CN240220
Organism Attribute
5.

Global developmental delay

A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age. [from HPO]

MedGen UID:
892935
Concept ID:
C4020875
Pathologic Function
6.

Delay

MedGen UID:
879911
Concept ID:
CN235300
Finding
7.

Intellectual disability

Subnormal intellectual functioning which originates during the developmental period. Intellectual disability, previously referred to as mental retardation, has been defined as an IQ score below 70. [from HPO]

MedGen UID:
811461
Concept ID:
C3714756
Mental or Behavioral Dysfunction
8.

Suspected autism

MedGen UID:
724664
Concept ID:
C1303176
Finding
9.

Autistic behavior

A disorder beginning in childhood. It is marked by the presence of markedly abnormal or impaired development in social interaction and communication and a markedly restricted repertoire of activity and interest. Manifestations of the disorder vary greatly depending on the developmental level and chronological age of the individual (DSM-IV). [from HPO]

MedGen UID:
504575
Concept ID:
CN000686
Finding
10.

Cognitive delay

A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age. [from HPO]

MedGen UID:
351243
Concept ID:
C1864897
Finding
11.

Intellectual disability

Subnormal intellectual functioning which originates during the developmental period. Intellectual disability, previously referred to as mental retardation, has been defined as an IQ score below 70. [from HPO]

MedGen UID:
334384
Concept ID:
C1843367
Finding
12.

Autistic behavior

A disorder beginning in childhood. It is marked by the presence of markedly abnormal or impaired development in social interaction and communication and a markedly restricted repertoire of activity and interest. Manifestations of the disorder vary greatly depending on the developmental level and chronological age of the individual (DSM-IV). [from HPO]

MedGen UID:
163547
Concept ID:
C0856975
Mental or Behavioral Dysfunction
13.

Autism spectrum disorder

A category of developmental disorders characterized by impaired communication and socialization skills. The impairments are incongruent with the individual's developmental level or mental age. These disorders can be associated with general medical or genetic conditions. [from NCI]

MedGen UID:
99336
Concept ID:
C0524528
Mental or Behavioral Dysfunction
14.

Developmental delay

Failure to meet, or late achievement of developmental milestones. [from NCI]

MedGen UID:
98410
Concept ID:
C0424605
Mental or Behavioral Dysfunction
15.

Risk factor

An aspect of personal behavior or lifestyle, environmental exposure, inborn or inherited characteristic, which, on the basis of epidemiological evidence, is known to be associated with a health-related condition considered important to prevent. [from MeSH]

MedGen UID:
48477
Concept ID:
C0035648
Finding
16.

Intellectual functioning disability

A developmental disorder characterized by less than average intelligence and significant limitations in adaptive behavior with onset before the age of 18. [from NCI]

MedGen UID:
7544
Concept ID:
C0025362
Mental or Behavioral Dysfunction
17.

Developmental disorder

A disorder diagnosed in childhood that is marked by either physical or mental impairment or both, which in turn affects the child from achieving age related developmental milestones. [from NCI]

MedGen UID:
3367
Concept ID:
C0008073
Mental or Behavioral Dysfunction
18.

Neurodevelopmental disorder

Neurodevelopmental disorder is a behavioral and cognitive disorder with onset during the developmental period that involve impaired or aberrant development of intellectual, motor, or social functions. [from SNOMEDCT_US]

MedGen UID:
453059
Concept ID:
C1535926
Mental or Behavioral Dysfunction
19.

Mental deficiency

Subnormal intellectual functioning which originates during the developmental period. Intellectual disability, previously referred to as mental retardation, has been defined as an IQ score below 70. [from HPO]

MedGen UID:
214593
Concept ID:
C0917816
Mental or Behavioral Dysfunction
20.

Disease Attributes

Clinical characteristics of disease or illness. [from MeSH]

MedGen UID:
199876
Concept ID:
C0752357
Disease or Syndrome
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