Hypertelorism, and Highly arched eyebrow

Intellectual developmental disorder with neuropsychiatric features is an autosomal recessive disorder characterized by moderate intellectual disability, relatively mild seizures, and neuropsychiatric abnormalities, such as anxiety, obsessive-compulsive behavior, and autistic features. Mild facial dysmorphic features may also be present (summary by Srour et al., 2017).

• Intellectual disability
• Seizures
• Global developmental delay
• Generalized hypotonia
• Hypertelorism

SOURCES: OMIM MENDELIAN

Acromegaloid facial appearance (AFA) syndrome is a multiple congenital anomalies/dysmorphic syndrome (see this term) with a probable autosomal dominant inheritance, characterized by a progressively coarse acromegaloid-like facial appearance with thickening of the lips and intraoral mucosa, large and doughy hands and, in some cases, developmental delay. AFA syndrome appears to be part of a phenotypic spectrum that includes hypertrichotic osteochondrodysplasia, Cantu type and hypertrichosis-acromegaloid facial appearance syndrome (see these terms).

ACROMEGALOID FACIAL APPEARANCE SYNDROME Is also known as afa syndrome|thick lips and oral mucosa

• Seizures
• Hypertelorism
• Micrognathia
• Intellectual disability, mild
• Coarse facial features

SOURCES: ORPHANET MENDELIAN

Peroxisomal fatty acyl-CoA reductase-1 disorder is an autosomal recessive disorder characterized by onset in infancy of severely delayed psychomotor development, growth retardation with microcephaly, and seizures. Some patients may have congenital cataracts and develop spasticity later in childhood. Biochemical studies tend to show decreased plasmalogen, consistent with a peroxisomal defect. The disorder is reminiscent of rhizomelic chondrodysplasia punctata (see, e.g., RCDP1, {215100}), although the characteristic skeletal abnormalities observed in RCDP are absent (Buchert et al., 2014).

SEVERE INTELLECTUAL DISABILITY-EPILEPSY-CATARACT SYNDROME DUE TO FATTY ACYL-COA REDUCTASE 1 DEFICIENCY Is also known as severe intellectual disability-epilepsy-cataract syndrome due to peroxisomal disorder|severe intellectual disability-epilepsy-cataract syndrome due to far1 deficiency

• Intellectual disability
• Seizures
• Global developmental delay
• Short stature
• Generalized hypotonia

SOURCES: ORPHANET OMIM MENDELIAN

3MC syndrome describes a rare developmental disorder, that unifies the overlapping autosomal recessive disorders previously known as Carnevale, Mingarelli, Malpuech and Michels syndromes, characterized by a spectrum of developmental anomalies that include distinctive facial dysmorphism (i.e. hypertelorism, blepharophimosis, blepharoptosis, highly arched eyebrows), cleft lip and/or palate, craniosynostosis, learning disability, radioulnar synostosis and genital and vesicorenal anomalies. Less common features reported include anterior chamber defects, cardiac anomalies (e.g. ventricular septal defect; see this term), caudal appendage, umbilical hernia/omphalocele and diastasis recti.

3MC SYNDROME Is also known as craniofacial-ulnar-renal syndrome|malpuech-michels-mingarelli-carnevale syndrome

• Intellectual disability
• Hearing impairment
• Scoliosis
• Hypertelorism
• Ptosis

SOURCES: ORPHANET MENDELIAN

Kleefstra syndrome-2 is an autosomal dominant neurodevelopmental disorder characterized by delayed psychomotor development, variable intellectual disability, and mild dysmorphic features (summary by Koemans et al., 2017).For a discussion of genetic heterogeneity of Kleefstra syndrome, see KLEFS1 (OMIM ).

• Intellectual disability
• Seizures
• Global developmental delay
• Short stature
• Generalized hypotonia

SOURCES: OMIM MENDELIAN

• Intellectual disability
• Seizures
• Short stature
• Hearing impairment
• Microcephaly

SOURCES: OMIM MENDELIAN

Chitayat syndrome is a rare condition characterized by respiratory distress presenting at birth, bilateral accessory phalanx resulting in shortened index fingers with ulnar deviation, hallux valgus, and characteristic facial features including prominent eyes, hypertelorism, depressed nasal bridge, full lips, and upturned nose (summary by Balasubramanian et al., 2017).

• Generalized hypotonia
• Hypertelorism
• Abnormal facial shape
• Depressed nasal bridge
• Brachydactyly

SOURCES: OMIM MENDELIAN

LINEAR SKIN DEFECTS WITH MULTIPLE CONGENITAL ANOMALIES 2; LSDMCA2 Is also known as aplcc|aplasia cutis congenita, reticulolinear, with microcephaly, facial dysmorphism, and other congenital anomalies

• Global developmental delay
• Short stature
• Microcephaly
• Growth delay
• Hypertelorism

SOURCES: OMIM MENDELIAN

Okur-Chung neurodevelopmental syndrome is an autosomal dominant disorder characterized by delayed psychomotor development, intellectual disability with poor speech, behavioral abnormalities, cortical malformations in some patients, and variable dysmorphic facial features. Additional features, including microcephaly, gastrointestinal problems, and low levels of immunoglobulins, may be observed in some patients (Okur et al., 2016).

• Intellectual disability
• Seizures
• Global developmental delay
• Generalized hypotonia
• Microcephaly

SOURCES: OMIM MENDELIAN

MRT61 is an autosomal recessive neurodevelopmental disorder characterized by delayed psychomotor development, moderate to severe intellectual disability, and variable dysmorphic facial features. More severely affected patients may develop refractory seizures and have brain abnormalities, including hypoplasia of the corpus callosum (summary by Alwadei et al., 2016).

MENTAL RETARDATION, AUTOSOMAL RECESSIVE 61; MRT61 Is also known as alwadei syndrome

• Intellectual disability
• Seizures
• Global developmental delay
• Generalized hypotonia
• Microcephaly

SOURCES: OMIM MENDELIAN