Delayed speech and language development, and Hip dysplasia

High match SPASTIC TETRAPLEGIA, THIN CORPUS CALLOSUM, AND PROGRESSIVE MICROCEPHALY; SPATCCM

Spastic tetraplegia, thin corpus callosum, and progressive microcephaly is an autosomal recessive neurodevelopmental disorder characterized by onset of those features and severely impaired global development in early infancy. Most patients are unable to achieve independent walking or speech; some patients have seizures (summary by Srour et al., 2015 and Heimer et al., 2015).

SPASTIC TETRAPLEGIA, THIN CORPUS CALLOSUM, AND PROGRESSIVE MICROCEPHALY; SPATCCM Is also known as ;asct1 deficiency; spastic quadriplegia-thin corpus callosum-progressive postnatal microcephaly syndrome

• Autosomal recessive inheritance
• Intellectual disability
• Seizures
• Global developmental delay
• Generalized hypotonia

SOURCES: ORPHANET MONDO OMIM UMLS

High match GLYCOSYLPHOSPHATIDYLINOSITOL BIOSYNTHESIS DEFECT 15; GPIBD15

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
• Hypertelorism

SOURCES: OMIM

High match DIHYDROPYRIMIDINASE DEFICIENCY; DPYSD

DPYS deficiency is an autosomal recessive inborn error of pyrimidine metabolism. Less than a dozen affected individuals have been reported. About half are asymptomatic, but rare patients with neurologic abnormalities have been reported. It is unclear whether or not these abnormalities are related to the enzymatic defect. Affected individuals theoretically could have severe toxicity after the administration of the antineoplastic drug 5-fluorouracil (5FU), although no cases have been reported (Hamajima et al., 1998; van Kuilenburg et al., 2007).See also dihydropyrimidine dehydrogenase deficiency (OMIM ), a similar disorder.

DIHYDROPYRIMIDINASE DEFICIENCY; DPYSD Is also known as dihydropyrimidinuria, dpys deficiency, dph deficiency;dihydropyrimidinase deficiency

• Autosomal recessive inheritance
• Intellectual disability
• Seizures
• Global developmental delay
• Growth delay

SOURCES: SCTID GARD ORPHANET OMIM MONDO UMLS

High match MENTAL RETARDATION, AUTOSOMAL DOMINANT 43; MRD43

• Autosomal dominant inheritance
• Intellectual disability
• Seizures
• Global developmental delay
• Generalized hypotonia

SOURCES: UMLS DOID MONDO OMIM GARD

High match NEURODEVELOPMENTAL DISORDER WITH ATAXIC GAIT, ABSENT SPEECH, AND DECREASED CORTICAL WHITE MATTER; NDAGSCW

NDAGSCW is a neurodevelopmental disorder characterized by severely delayed psychomotor development apparent from infancy. Affected individuals have delayed and difficulty walking, intellectual disability, absent speech, and variable additional features, including hip dysplasia, tapering fingers, and seizures. Brain imaging shows decreased cortical white matter, often with decreased cerebellar white matter, thin corpus callosum, and thin brainstem (summary by Lamers et al., 2017).

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

SOURCES: OMIM

High match 2Q23.1 MICRODELETION SYNDROME

The newly described 2q23.1 microdeletion syndrome includes severe intellectual deficit with pronounced speech delay, behavioral abnormalities including hyperactivity and inappropriate laughter, short stature and seizures.

2Q23.1 MICRODELETION SYNDROME Is also known as del(2)(q23.1); monosomy 2q23.1; pseudo-angelman syndrome

• Seizures
• Short stature
• Microcephaly
• Ataxia
• Growth delay

SOURCES: ORPHANET

Medium match HAREL-YOON SYNDROME; HAYOS

Harel-Yoon syndrome is a syndromic neurodevelopmental disorder characterized by delayed psychomotor development, intellectual disability, truncal hypotonia, spasticity, and peripheral neuropathy. Other more variable features such as optic atrophy may also occur. Laboratory studies in some patients show evidence of mitochondrial dysfunction (summary by Harel et al., 2016).

HAREL-YOON SYNDROME; HAYOS Is also known as ;harel-yoon syndrome

• Autosomal recessive inheritance
• Autosomal dominant inheritance
• Intellectual disability
• Seizures
• Global developmental delay

SOURCES: ORPHANET OMIM MONDO UMLS

Medium match MUSCULAR DYSTROPHY, LIMB-GIRDLE, TYPE 2S; LGMD2S

LGMD2S is an autosomal recessive disorder characterized by childhood-onset of proximal muscle weakness resulting in gait abnormalities and scapular winging. Serum creatine kinase is increased. A subset of patients may show a hyperkinetic movement disorder with chorea, ataxia, or dystonia and global developmental delay (summary by Bogershausen et al., 2013). Additional more variable features include alacrima, achalasia, cataracts, or hepatic steatosis (Liang et al., 2015; Koehler et al., 2017).For discussion of genetic heterogeneity of autosomal recessive limb-girdle muscular dystrophy, see LGMD2A (OMIM ).

MUSCULAR DYSTROPHY, LIMB-GIRDLE, TYPE 2S; LGMD2S Is also known as ;lgmd2s

• Autosomal recessive inheritance
• Intellectual disability
• Seizures
• Global developmental delay
• Short stature

SOURCES: DOID ORPHANET OMIM MONDO UMLS GARD

Medium match MEIER-GORLIN SYNDROME 6; MGORS6

• Autosomal dominant inheritance
• Global developmental delay
• Hearing impairment
• Micrognathia
• Strabismus

SOURCES: UMLS MONDO OMIM

Medium match HYPERPHOSPHATASIA WITH MENTAL RETARDATION SYNDROME 6; HPMRS6

Hyperphosphatasia with mental retardation syndrome-6 (HPMRS6) is an autosomal recessive multisystem disorder characterized by global developmental delay, dysmorphic features, seizures, and congenital cataracts. Severity is variable, and the disorder may show a range of phenotypic and biochemical abnormalities, including increased serum alkaline phosphatase levels (summary by Ilkovski et al., 2015). The disorder is caused by a defect in glycosylphosphatidylinositol (GPI) biosynthesis.For a discussion of genetic heterogeneity of HPMRS, see HPMRS1 (OMIM ).For a discussion of genetic heterogeneity of GPI biosynthesis defects, see GPIBD1 (OMIM ).

HYPERPHOSPHATASIA WITH MENTAL RETARDATION SYNDROME 6; HPMRS6 Is also known as glycosylphosphatidylinositol biosynthesis defect 12;gpibd12

• Autosomal recessive inheritance
• Seizures
• Global developmental delay
• Generalized hypotonia
• Microcephaly

SOURCES: MONDO UMLS OMIM