Question: What is (are) X-linked intellectual disability, Siderius type ?
Answer: X-linked intellectual disability, Siderius type is a condition characterized by mild to moderate intellectual disability that affects only males. Affected boys often have delayed development of motor skills such as walking, and their speech may be delayed. Individuals with X-linked intellectual disability, Siderius type frequently also have an opening in the lip (cleft lip) with an opening in the roof of the mouth (cleft palate). A cleft can occur on one or both sides of the upper lip. Some boys and men with this condition have distinctive facial features, including a long face, a sloping forehead, a broad nasal bridge, a prominent bone in the lower forehead (supraorbital ridge), and outside corners of the eyes that point upward (upslanting palpebral fissures). Affected individuals may also have low-set ears and large hands.
Source: GHR

Question: What are the genetic changes related to X-linked intellectual disability, Siderius type ?
Answer: X-linked intellectual disability, Siderius type is caused by mutations in the PHF8 gene. This gene provides instructions for making a protein that is found in the nucleus of cells, particularly in brain cells before and just after birth. The PHF8 protein attaches (binds) to complexes called chromatin to regulate the activity (expression) of other genes. Chromatin is the network of DNA and protein that packages DNA into chromosomes. Binding with the PHF8 protein is part of the process that changes the structure of chromatin (chromatin remodeling) to alter how tightly regions of DNA are packaged. Chromatin remodeling is one way gene expression is regulated; when DNA is tightly packed, gene expression is often lower than when DNA is loosely packed. Most PHF8 gene mutations lead to an abnormally short protein that gets transported out of the cell's nucleus. Outside of the nucleus, the PHF8 protein cannot interact with chromatin to regulate gene expression. While the exact disease mechanism is unknown, it is likely that a lack of PHF8 protein in the nucleus of brain cells before birth prevents chromatin remodeling, altering the normal expression of genes involved in intellectual function and formation of structures along the midline of the skull. This altered gene expression leads to intellectual disability, cleft lip and palate, and the other features of X-linked intellectual disability, Siderius type.
Source: GHR

Question: What are the treatments for X-linked intellectual disability, Siderius type ?
Answer: These resources address the diagnosis or management of X-linked intellectual disability, Siderius type: - Cincinnati Children's Hospital: Cleft Lip / Cleft Palate Bottle Feeding - Cleveland Clinic: Cleft Lip & Palate Surgery - Genetic Testing Registry: Siderius X-linked mental retardation syndrome - Nemours Children's Health System: Cleft Lip and Palate These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Drug Therapy - Surgery and Rehabilitation - Genetic Counseling - Palliative Care
Source: GHR