Ataxia, and Webbed neck

SLC35A1-CDG is an extremely rare form of CDG syndrome (see this term) characterized clinically in the single reported case by repeated hemorrhagic incidents, including severe pulmonary hemorrhage.

SLC35A1-CDG Is also known as cdg iif|congenital disorder of glycosylation type iif|cmp-sialic acid transporter deficiency|congenital disorder of glycosylation type 2f|cdg-iif|carbohydrate deficient glycoprotein syndrome type iif|cdg2f|cdg syndrome type iif|cdgiif

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

SOURCES: OMIM MESH ORPHANET MENDELIAN

Takenouchi-Kosaki syndrome is a highly heterogeneous autosomal dominant complex congenital developmental disorder affecting multiple organ systems. The core phenotype includes delayed psychomotor development with variable intellectual disability, dysmorphic facial features, and cardiac, genitourinary, and hematologic or lymphatic defects, including thrombocytopenia and lymphedema. Additional features may include abnormalities on brain imaging, skeletal anomalies, and recurrent infections. Some patients have a milder disease course reminiscent of Noonan syndrome (see, e.g., NS1, {163950}) (summary by Martinelli et al., 2018).

MACROTHROMBOCYTOPENIA-LYMPHEDEMA-DEVELOPMENTAL DELAY-FACIAL DYSMORPHISM-CAMPTODACTYLY SYNDROME Is also known as takenouchi-kosaki syndrome|macrothrombocytopenia and mental retardation syndrome

• Intellectual disability
• Seizures
• Global developmental delay
• Generalized hypotonia
• Hearing impairment

SOURCES: OMIM ORPHANET MENDELIAN

Klippel-Feil syndrome-4 with nemaline myopathy and facial dysmorphism is an autosomal recessive disorder characterized mainly by severe hypotonia apparent from infancy. Klippel-Feil anomaly is primarily defined by fusion of the cervical spine, with associated low posterior hairline and limited neck mobility being observed in about half of patients (summary by Alazami et al., 2015).For a general description and a discussion of genetic heterogeneity of Klippel-Feil syndrome, see KFS1 (OMIM ).

• Short stature
• Generalized hypotonia
• Microcephaly
• Scoliosis
• Micrognathia

SOURCES: OMIM ORPHANET MENDELIAN

Cardiofaciocutaneous (CFC) syndrome is a RASopathy characterized by craniofacial dysmorphology, congenital heart disease, dermatological abnormalities (most commonly hyperkeratotic skin and sparse, curly hair), growth retardation and intellectual disability.

CARDIOFACIOCUTANEOUS SYNDROME Is also known as cfcs|cfc syndrome

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

SOURCES: ORPHANET OMIM MENDELIAN

Noonan syndrome (NS) is an autosomal dominant disorder characterized by short stature, facial dysmorphism, and a wide spectrum of congenital heart defects. The distinctive facial features consist of a broad forehead, hypertelorism, downslanting palpebral fissures, a high-arched palate, and low-set, posteriorly rotated ears. Cardiac involvement is present in up to 90% of patients. Pulmonic stenosis and hypertrophic cardiomyopathy are the most common forms of cardiac disease, but a variety of other lesions are also observed. Additional relatively frequent features include multiple skeletal defects (chest and spine deformities), webbed neck, mental retardation, cryptorchidism, and bleeding diathesis (summary by Tartaglia et al., 2002). Genetic Heterogeneity of Noonan SyndromeSee also NS3 (OMIM ), caused by mutation in the KRAS gene (OMIM ); NS4 (OMIM ), caused by mutation in the SOS1 gene (OMIM ); NS5 (OMIM ), caused by mutation in the RAF1 gene (OMIM ); NS6 (OMIM ), caused by mutation in the NRAS gene (OMIM ); NS7 (OMIM ), caused by mutation in the BRAF gene (OMIM ); NS8 (OMIM ), caused by mutation in the RIT1 gene (OMIM ); NS9 (OMIM ), caused by mutation in the SOS2 gene (OMIM ); and NS10 (OMIM ), caused by mutation in the LZTR1 gene (OMIM ).See also NS2 (OMIM ) for a possible autosomal recessive form of NS; Noonan syndrome-like disorder with loose anagen hair-1 (NSLH1 ), caused by mutation in the SHOC2 gene (OMIM ); Noonan syndrome-like disorder with loose anagen hair-2 (NSLH2 ), caused by mutation in the PPP1CB gene (OMIM ); and Noonan syndrome-like disorder with or without juvenile myelomonocytic leukemia (NSLL ), caused by mutation in the CBL gene (OMIM ).Mutations in the neurofibromin gene (NF1 ), which is the site of mutations causing classic neurofibromatosis type I (NF1 ), have been found in neurofibromatosis-Noonan syndrome (NFNS ).

NOONAN SYNDROME 1; NS1 Is also known as female pseudo-turner syndrome|male turner syndrome|noonan syndrome|turner phenotype with normal karyotype

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

SOURCES: OMIM MENDELIAN

Simpson-Golabi-Behmel syndrome (SGBS, also referred to as SGBS type 1) is a rare X-linked multiple congenital anomalies syndrome, characterized by pre- and postnatal overgrowth, distinctive craniofacial features, variable congenital malformations, organomegaly and an increased tumor risk.

SIMPSON-GOLABI-BEHMEL SYNDROME Is also known as sgbs|sgbs1|simpson-golabi-behmel syndrome type 1|golabi-rosen syndrome|sdys|x-linked dysplasia gigantism syndrome|dysplasia gigantism syndrome, x-linked|simpson dysmorphia syndrome|dgsx|bulldog syndrome

• Intellectual disability
• Seizures
• Global developmental delay
• Generalized hypotonia
• Hearing impairment

SOURCES: ORPHANET OMIM MENDELIAN

The Cornelia de Lange syndrome (CDLS) is a multisystem malformation syndrome recognized primarily on the basis of characteristic facial dysmorphism, including low anterior hairline, arched eyebrows, synophrys, anteverted nares, maxillary prognathism, long philtrum, thin lips, and 'carp' mouth, in association with prenatal and postnatal growth retardation, mental retardation and, in many cases, upper limb anomalies. However, there is wide clinical variability in this disorder, with milder phenotypes that may be difficult to ascertain on the basis of physical features (summary by Rohatgi et al., 2010).Boyle et al. (2015) provided a detailed review of CDLS, including clinical features, diagnosis, and genetic counseling. Genetic Heterogeneity of Cornelia de Lange SyndromeAbout 50 to 60% of the cases of CDLS are due to mutation in the NIPBL gene (Musio et al., 2006; Rohatgi et al., 2010).One X-linked form of CDLS (CDLS2 ) is caused by mutation in the SMC1A gene (OMIM ), which accounts for about 5% of cases. Two milder variants of Cornelia de Lange syndrome have been identified: CDLS3 (OMIM ), caused by mutation in the SMC3 gene (OMIM ), and CDLS4 (OMIM ), caused by mutation in the RAD21 gene (OMIM ). All 4 genes, NIPBL, SMC1A, SMC3, and RAD21, encode components of the cohesin complex. Another X-linked form, CDLS5 (OMIM ), is caused by mutation in the HDAC8 gene (OMIM ), the vertebrate histone deacetylase of SMC3.

CORNELIA DE LANGE SYNDROME 1; CDLS1 Is also known as typus degenerativus amstelodamensis|brachmann-de lange syndrome|cdl|de lange syndrome|cdls|bdls

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

SOURCES: OMIM MENDELIAN

Klippel-Feil Syndrome is characterised by improper segmentation of cervical segments resulting in congenitally fused cervical vertebrae.

ISOLATED KLIPPEL-FEIL SYNDROME Is also known as congenital cervical vertebral fusion|klippel-feil sequence|congenital fused cervical segments|klippel-feil malformation|cervical vertebral fusion, autosomal recessive|kfs, autosomal recessive

• Hearing impairment
• Scoliosis
• Hypertelorism
• Sensorineural hearing impairment
• Cleft palate

SOURCES: OMIM ORPHANET MENDELIAN

ALKKUCS is an autosomal recessive severe neurodevelopmental disorder characterized by arthrogryposis, brain abnormalities associated with cerebral parenchymal underdevelopment, and global developmental delay. Most affected individuals die in utero or soon after birth. Additional abnormalities may include hypotonia, dysmorphic facial features, and involvement of other organ systems, such as cardiac or renal. The few patients who survive have variable intellectual disability and may have seizures (summary by Gueneau et al., 2018).

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

SOURCES: OMIM MENDELIAN

Spondylo-ocular syndrome is a very rare association of spinal and ocular manifestations that is characterized by dense cataracts, and retinal detachment along with generalized osteoporosis and platyspondyly. Mild craniofacial dysphormism has been reported including short neck, large head and prominent eyebrows.

• Intellectual disability
• Short stature
• Generalized hypotonia
• Hearing impairment
• Hypertelorism

SOURCES: ORPHANET OMIM MENDELIAN