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46,XY gonadal dysgenesis-motor and sensory neuropathy syndrome
46,XY gonadal dysgenesis-motor and sensory neuropathy syndrome is a rare, genetic, developmental defect during embryogenesis disorder characterized by partial (unilateral testis, persistence of Müllerian duct structures) or complete (streak gonads only) gonadal dysgenesis, usually manifesting with primary amenorrhea in individuals with female phenotype but 46,XY karyotype, and sensorimotor dysmyelinating minifascicular polyneuropathy, which presents with numbness, weakness, exercise-induced muscle cramps, sensory disturbances and reduced/absent deep tendon reflexes. Germ cell tumors (seminoma, dysgerminoma, gonadoblastoma) may develop from the gonadal tissue. [from ORDO]
Holoprosencephaly 11
Any holoprosencephaly in which the cause of the disease is a mutation in the CDON gene. [from MONDO]
Basal cell carcinoma, susceptibility to, 1
Cutaneous basal cell carcinoma (BCC) is the most common cancer among people of European ancestry (Stacey et al., 2009). The primary environmental risk factor for BCC is sun exposure, but genetics also has a substantial role. Some of the sequence variants that confer susceptibility seem to operate through their association with fair-pigmentation traits common among Europeans, resulting in reduced protection from the damaging effects of ultraviolet (UV) radiation. Other sequence variants have no obvious role in pigmentation or UV susceptibility but instead seem to operate in the contexts of growth and differentiation of the basal layers of the skin (Stacey et al., 2008; Epstein, 2008; Gudbjartsson et al., 2008; Rafnar et al., 2009). See ASIP (600201), TYR (606933), and SHEP5 (227240) for examples of basal cell carcinoma associated with fair skin or sensitivity to sun. Basal cell carcinoma occurs as a feature of multiple syndromes, including basal cell nevus syndrome (BCNS; 109400), Bazex syndrome (301845), Rombo syndrome (180730), Brooke-Spiegler syndrome (605041), Muir-Torre syndrome (158320), and xeroderma pigmentosum (see 278700). Abnormalities in the Hedgehog signaling pathway are found in basal cell carcinomas; see SHH (600725) and SMOH (601500). Genetic Heterogeneity of Susceptibility to Basal Cell Carcinoma Susceptibility to basal cell carcinoma is a genetically heterogeneous trait. The BCC1 locus maps to chromosome 1p36. Also see BCC2 (613058) on 1q42; BCC3 (613059) on 5p15; BCC4 (613061) on 12q13; BCC5 (613062) on 9p21; and BCC6 (613063) on 7q32. Variation in the 3-prime untranslated region of TP53 (191170) increases susceptibility to basal cell carcinoma (BCC7; 614740). Somatic mutation contributing to the formation of basal cell carcinoma has been identified in the RASA1 (139150), PTCH1 (601309), and PTCH2 (603673) genes. [from OMIM]
46,XY sex reversal 7
Holoprosencephaly 7
Holoprosencephaly (HPE) is the most commonly occurring congenital structural forebrain anomaly in humans. HPE is associated with mental retardation and craniofacial malformations. Considerable heterogeneity in the genetic causes of HPE has been demonstrated (Ming et al., 2002). For general phenotypic information and a discussion of genetic heterogeneity of holoprosencephaly, see HPE1 (236100). [from OMIM]
Microphthalmia, isolated, with coloboma 5
Any microphthalmia, isolated, with coloboma in which the cause of the disease is a mutation in the SHH gene. [from MONDO]
Acrocapitofemoral dysplasia
Acrocapitofemoral dysplasia (ACFD) is an autosomal recessive skeletal dysplasia characterized by postnatal-onset disproportionate short stature, relatively large head, narrow thorax, lumbar lordosis, short limbs, and brachydactyly with small broad nails (Ozyavuz Cubuk and Duz, 2021). [from OMIM]
Holoprosencephaly 3
Any holoprosencephaly in which the cause of the disease is a mutation in the SHH gene. [from MONDO]
Solitary median maxillary central incisor syndrome
A single maxillary central incisor positioned in the midline with morphological symmetry of the crown and bordered by lateral incisors. [from HPO]
Schizencephaly
Brunelli et al. (1996) described schizencephaly as an extremely rare congenital disorder characterized by a full-thickness cleft within the cerebral hemispheres. The clefts are lined with gray matter and most commonly involve the parasylvian regions (Wolpert and Barnes, 1992). Large portions of the cerebral hemispheres may be absent and replaced by cerebrospinal fluid. Two types of schizencephaly have been described, depending on the size of the area involved and the separation of the cleft lips (Wolpert and Barnes, 1992). Type I schizencephaly consists of a fused cleft. This fused pial-ependymal seam forms a furrow in the developing brain, and is lined by polymicrogyric gray matter. In type II schizencephaly, there is a large defect, a holohemispheric cleft in the cerebral cortex filled with fluid and lined by polymicrogyric gray matter. The clinical manifestations depend on the severity of the lesion. Patients with type I are often almost normal; they may have seizures and spasticity. In type II abnormalities, there is usually mental retardation, seizures, hypotonia, spasticity, inability to walk or speak, and blindness. Schizencephaly may be part of the larger phenotypic spectrum of holoprosencephaly (HPE; see 236100). [from OMIM]
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