Global developmental delay, and Prominent forehead

This disorder comprises macrocephaly, megalencephaly, ventriculomegaly, polymicrogyria, and polydactyly. Most affected individuals have severely delayed psychomotor development (summary by Mirzaa et al., 2014).For a discussion of genetic heterogeneity of MPPH, see MPPH1 (OMIM ).

• Global developmental delay
• Macrocephaly
• Ventriculomegaly
• Hydrocephalus
• Absent speech

SOURCES: OMIM MENDELIAN

• Intellectual disability
• Global developmental delay
• Short stature
• Generalized hypotonia
• Abnormal facial shape

SOURCES: OMIM MENDELIAN

1qter deletion syndrome is a chromosomal anomaly characterized by an intellectual deficiency, progressive microcephaly, seizures, growth delay, distinct facial dysmorphic features and various midline defects including cardiac, corpus callosum, gastro-oesophalgeal and urogenital anomalies.

DISTAL MONOSOMY 1Q Is also known as telomeric deletion 1q|distal deletion 1q|monosomy 1qter

• Intellectual disability
• Seizures
• Global developmental delay
• Short stature
• Microcephaly

SOURCES: ORPHANET MENDELIAN

Microcephalic primordial dwarfism, Alazami type is a rare, genetic developmental defect during embryogenesis syndrome characterized by severe intellectual disability, distinct dysmorphic facial features (i.e. triangular face with prominent forehead, narrow palpebral fissures, deep-set eyes, low-set ears, broad nose, malar hypoplasia, short philtrum, macrostomia, widely spaced teeth) and pre and postnatal proportionate short stature, ranging from primordial dwarfism (height below -3.5 SD) to a milder phenotype with less severe growth restriction (height below -2.5 SD). Other reported features include skeletal findings (e.g. scoliosis), microcephaly, involuntary hand movements, hypersensitivity to stimuli and behavioral problems, such as anxiety.

MICROCEPHALIC PRIMORDIAL DWARFISM, ALAZAMI TYPE Is also known as facial dysmorphism, intellectual disability, and primordial dwarfism|alazami syndrome

• Intellectual disability
• Global developmental delay
• Short stature
• Microcephaly
• Scoliosis

SOURCES: ORPHANET OMIM MENDELIAN

• Intellectual disability
• Global developmental delay
• Short stature
• Hypertelorism
• Abnormal facial shape

SOURCES: MESH OMIM MENDELIAN

Intellectual disability-severe speech delay-mild dysmorphism syndrome is a rare, genetic, syndromic intellectual disability disorder, with highly variable phenotype, typically characterized by mild to severe global development delay, severe speech and language impairment, mild to severe intellectual disability, dysphagia, hypotonia, relative to true macrocephaly, and behavioral problems that may include autistic features, hyperactivity, and mood lability. Facial gestalt typically features a broad, prominent forehead, hypertelorism, downslanting palpebral fissures, ptosis, a short bulbous nose with broad tip, thick vermilion border, wide, and open mouth with downturned corners. Brain, cardiac, urogenital and ocular malformations may be associated.

INTELLECTUAL DISABILITY-SEVERE SPEECH DELAY-MILD DYSMORPHISM SYNDROME Is also known as foxp1 syndrome

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

SOURCES: ORPHANET OMIM MENDELIAN

Regressive spondylometaphyseal dysplasia is a rare, primary bone dysplasia characterized by mild short stature, rhizomelic shortening of the arms and legs, bowing of long bones with widened and irregular metaphyses, thoracolumbar kyphosis, and metacarpal shortening. A marked improvement of the radiologic skeletal features is typical. Pelger-Huet anomaly (i.e. dumbbell shape bilobed nuclei of neutrophils) is a characteristic hematological feature of this disease.

REGRESSIVE SPONDYLOMETAPHYSEAL DYSPLASIA Is also known as regressive spondylometaphyseal dysplasia

• Global developmental delay
• Short stature
• Microcephaly
• Flexion contracture
• Brachydactyly

SOURCES: OMIM ORPHANET MENDELIAN

GPIBD15 is an autosomal recessive disorder characterized by delayed psychomotor development, variable intellectual disability, hypotonia, early-onset seizures in most patients, and cerebellar atrophy, resulting in cerebellar signs including gait ataxia and dysarthria. The disorder is caused by a defect in glycosylphosphatidylinositol (GPI) biosynthesis (summary by Nguyen et al., 2017).For a discussion of genetic heterogeneity of GPI biosynthesis defects, see GPIBD1 (OMIM ).

GLYCOSYLPHOSPHATIDYLINOSITOL BIOSYNTHESIS DEFECT 15; GPIBD15 Is also known as developmental delay, epilepsy, cerebellar atrophy, and osteopenia

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

SOURCES: OMIM MENDELIAN

The features of Ehlers-Danlos syndrome spondylodysplastic type 2 include an aged appearance, developmental delay, short stature, craniofacial disproportion, generalized osteopenia, defective wound healing, hypermobile joints, hypotonic muscles, and loose but elastic skin (Okajima et al., 1999).For a discussion of genetic heterogeneity of the spondylodysplastic type of Ehlers-Danlos syndrome, see {130070}.

EHLERS-DANLOS SYNDROME, SPONDYLODYSPLASTIC TYPE, 2; EDSSPD2 Is also known as ehlers-danlos syndrome, progeroid type, 2, formerly|edsp2, formerly

• Global developmental delay
• Short stature
• Generalized hypotonia
• Cleft palate
• Talipes equinovarus

SOURCES: OMIM MENDELIAN

Spastic paraplegia, intellectual disability, nystagmus, and obesity (SINO) is an autosomal dominant neurologic disorder characterized by rapid growth in infancy, global developmental delay, spastic paraplegia, variable ophthalmologic defects, and dysmorphic facial features (summary by Josifova et al., 2016).

SPASTIC PARAPLEGIA-INTELLECTUAL DISABILITY-NYSTAGMUS-OBESITY SYNDROME Is also known as sino syndrome

• Intellectual disability
• Global developmental delay
• Generalized hypotonia
• Nystagmus
• Abnormal facial shape

SOURCES: ORPHANET OMIM MENDELIAN