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Genetic Abnormality
Genetic Abnormalities Presentation
| Question | Answer |
|---|---|
| What type of chromosome # abnormality is Turner Syndrome? | Monosomy- 1 chromosomal pair at specific site |
| Common population with Turner Syndrome? | Newborn girls |
| Turner Syndrome looks like | Transient congenital lymphedema; Small stature; Web-like lateral neck; Gonadal underdevelopment; Bone trabecular abnormalities; Possible cognitive deficiencies |
| What is trisomy? | 3 of particular chromosome at specific site |
| What disease is trisomy? | Kleinfelter syndrome |
| Kleinfelter Syndrome population | 1/500 males |
| Kleinfelter Syndrome most common cause of _________ in males | Infertility |
| S/sx Kleinfelter Syndrome | Hypogonadism, Long limbs, Slim stature, Obesity if don't get testosterone replacement prior to puberty |
| Trisomy 21 | Down Syndrome; Most frequent type with cognitive delay; Increased maternal/paternal age |
| Cri Du Chat due to? | Chromosomal Deletion of short arm of chromosome 5 |
| Cri Du Chat S/sx | Abnormal laryngeal development (weak cry); Cognitive deficit w/ microcephaly; Hypotonia; Scoliosis; Congenital heart abnormalities in 30% |
| Autosomal Dominant- Achondroplasia most common cause of? | Short Stature; New mutations 80-90% incidence; Bilateral shortness of humerus & femur; Macrocephaly w/ hydrocephalus at birth; 46% spinal complications |
| Autosomal Dominant- Osteogenesis Imperfecta (OI) | Error in collagen development resulting in multiple fx's |
| Which types of OI are autosomal dominant & result from spontaneous mutations? | 1, 2, 4 |
| Which type of OI is autosomal recessive? | 3 |
| Type 4 OI | Mild: Osteoporosis, Normal sclerae, Limited fx #s |
| Type 2 OI | Congenitally lethal resulting in stillborn infants |
| Type 1 OI | Good prognosis; Long bones most affected fx sites; Fx decrease post-puberty but pregnancy lactation & inactivity can negatively affect outcomes |
| Autosomal Recessive | Both parents transmit; 25% offspring have disorder |
| 2 Autosomal Recessive Disorders | CF; SMA |
| Microdeletions; Prader-Will | Father; Mild cognitive delay, hypotonia, short stature; Hyperphagia--obesity; Subtype of fragile x sx |
| Microdeletions: Angelman | Mother; Severe cognitive delay; Microcephaly; Seizures; Ataxia with puppet-like gait & frequent laughter |
| X-Linked primarily affects what sex? | Boys |
| X-Linked Diseases | Duchenne MD; Fragile X; Lesch-Nyhan; Rett |
| Fragile X Syndrome | Normal lifespan; Most common cause of male mental retardation second to Downs; Increased head circumference; Prominent forehead, hypotonia, torticollis & scoliosis |
| Lesch-Nyhan is excessive production of? | Uric Acid |
| Lesch-Nyhan | pasticity at 6-8 months; Choreoathetosis; Autism; Self mutilation tendences (ie biting self) |
| Rett Syndrome | Females only, Males die at birth; Normal development followed by gradual loss of cognitive communication & motor skills, onset of hypotonia & ataxia; Often mis-dx'd as autism due to trunk rocking & decreased language & eye contact |
| Amputations/Limb Deficiencies- Congenital Amputations happen when? | Within first 4-6 week gestation |
| Ingestion of what has been correlated to limb absence/partial absence? | Thalidomide |
| Premature amnion rupture may cause? | Band restriction around a limb |
| Brachial Plexus Injury | Compression or traction; Unilateral; Trauma or anomalies such as cervical rib/abnormal thoracic vertebrae; Usu associated with difficult birth; Px related to injury severity |
| Erbs Palsy | C5-6; Paralysis of levator scapulae, rhomboids, deltoid, serratus anterior, supinator, forearm extensors |
| Klumpke Paralysis/Palsy | C7-T1; More distal problems |
| Erb-Klumpke | Mixed involvement from C5-T1 |
| Torticollis | Fetal positioning or may develop post-natally due to excessive stretch during delivery; Exaggerated lateral flexion & rotation of head due to SCM tightness & plagiocephaly |
| Torticollis Treatment | Frequent stretching of SCM; Helmet |