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Items: 17

1.

Rett syndrome

MECP2-related disorders in females include classic Rett syndrome, variant Rett syndrome, and mild learning disabilities. A pathogenic MECP2 variant in a male is presumed to most often be lethal; phenotypes in rare surviving males are primarily severe neonatal encephalopathy and manic-depressive psychosis, pyramidal signs, Parkinsonian, and macro-orchidism (PPM-X syndrome). Classic Rett syndrome, a progressive neurodevelopmental disorder primarily affecting girls, is characterized by apparently normal psychomotor development during the first six to 18 months of life, followed by a short period of developmental stagnation, then rapid regression in language and motor skills, followed by long-term stability. During the phase of rapid regression, repetitive, stereotypic hand movements replace purposeful hand use. Additional findings include fits of screaming and inconsolable crying, autistic features, panic-like attacks, bruxism, episodic apnea and/or hyperpnea, gait ataxia and apraxia, tremors, seizures, and acquired microcephaly. Atypical Rett syndrome is observed increasingly as MECP2 variants are identified in individuals previously diagnosed with: clinically suspected but molecularly unconfirmed Angelman syndrome; intellectual disability with spasticity or tremor; mild learning disability; or (rarely) autism. Severe neonatal encephalopathy resulting in death before age two years is the most common phenotype observed in affected males. [from GTR]

MedGen UID:
48441
Concept ID:
C0035372
Disease or Syndrome
2.

Syndrome

A characteristic symptom complex. [from MeSH]

MedGen UID:
11688
Concept ID:
C0039082
Disease or Syndrome
3.

Borries syndrome

MedGen UID:
542920
Concept ID:
C0270677
Disease or Syndrome
4.

History

The aggregate of past events; the continuum of events occurring in succession leading from the past to the present; a record or narrative description of past events. [from NCI]

MedGen UID:
389153
Concept ID:
C2004062
Finding
5.

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
6.

X-linked hereditary disease

Genetic diseases that are linked to gene mutations on the X CHROMOSOME in humans (X CHROMOSOME, HUMAN) or the X CHROMOSOME in other species. Included here are animal models of human X-linked diseases. [from MeSH]

MedGen UID:
222910
Concept ID:
C1138434
Disease or Syndrome
7.

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
8.

Mental Retardation, X Linked

A class of genetic disorders resulting in INTELLECTUAL DISABILITY that is associated either with mutations of GENES located on the X CHROMOSOME or aberrations in the structure of the X chromosome (SEX CHROMOSOME ABERRATIONS). [from MeSH]

MedGen UID:
211749
Concept ID:
C1136249
Disease or Syndrome
9.

Inborn genetic diseases

Diseases that are caused by genetic mutations present during embryo or fetal development, although they may be observed later in life. The mutations may be inherited from a parent's genome or they may be acquired in utero. [from MeSH]

MedGen UID:
181981
Concept ID:
C0950123
Disease or Syndrome
10.

Heredodegenerative Disorders, Nervous System

Inherited disorders characterized by progressive atrophy and dysfunction of anatomically or physiologically related neurologic systems. [from MeSH]

MedGen UID:
155945
Concept ID:
C0751870
Disease or Syndrome
11.

Neurobehavioral Manifestations

Signs and symptoms of higher cortical dysfunction caused by organic conditions. These include certain behavioral alterations and impairments of skills involved in the acquisition, processing, and utilization of knowledge or information. [from MeSH]

MedGen UID:
105653
Concept ID:
C0525041
Sign or Symptom
12.

Intellectual disability, profound

Profound mental retardation is defined as an intelligence quotient (IQ) below 20. [from HPO]

MedGen UID:
43816
Concept ID:
C0020796
Finding; Mental or Behavioral Dysfunction
13.

Neurologic Manifestations

Clinical signs and symptoms caused by nervous system injury or dysfunction. [from MeSH]

MedGen UID:
18017
Concept ID:
C0027854
Finding
14.

Disorder of nervous system

A non-neoplastic or neoplastic disorder that affects the brain, spinal cord, or peripheral nerves. [from NCI]

MedGen UID:
14336
Concept ID:
C0027765
Disease or Syndrome
15.

Congenital, Hereditary, and Neonatal Diseases and Abnormalities

Diseases existing at birth and often before birth, or that develop during the first month of life (INFANT, NEWBORN, DISEASES), regardless of causation. Of these diseases, those characterized by structural deformities are termed CONGENITAL ABNORMALITIES. [from MeSH]

MedGen UID:
14319
Concept ID:
C0027612
Congenital Abnormality; Disease or Syndrome
16.

Mental retardation, X-linked 14

Nonsyndromic mental retardation with inconsistent abnormalities. [from MCA/MR]

MedGen UID:
163231
Concept ID:
C0796220
Disease or Syndrome
17.

Mental retardation 63, X-linked

MedGen UID:
337002
Concept ID:
C1845672
Disease or Syndrome
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