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1.

Mitochondrial inheritance

A mode of inheritance that is observed for traits related to a gene encoded on the mitochondrial genome. Because the mitochondrial genome is essentially always maternally inherited, a mitochondrial condition can only be transmitted by females, although the condition can affect both sexes. The proportion of mutant mitochondria can vary (heteroplasmy). [from HPO]

MedGen UID:
165802
Concept ID:
C0887941
Genetic Function
2.

Mitochondrial diseases

Mitochondrial diseases are a clinically heterogeneous group of disorders that arise as a result of dysfunction of the mitochondrial respiratory chain. They can be caused by mutation of genes encoded by either nuclear DNA or mitochondrial DNA (mtDNA). While some mitochondrial disorders only affect a single organ (e.g., the eye in Leber hereditary optic neuropathy [LHON]), many involve multiple organ systems and often present with prominent neurologic and myopathic features. Mitochondrial disorders may present at any age. Many individuals with a mutation of mtDNA display a cluster of clinical features that fall into a discrete clinical syndrome, such as the Kearns-Sayre syndrome (KSS), chronic progressive external ophthalmoplegia (CPEO), mitochondrial encephalomyopathy with lactic acidosis and stroke-like episodes (MELAS), myoclonic epilepsy with ragged-red fibers (MERRF), neurogenic weakness with ataxia and retinitis pigmentosa (NARP), or Leigh syndrome (LS). However, considerable clinical variability exists and many individuals do not fit neatly into one particular category, which is well-illustrated by the overlapping spectrum of disease phenotypes (including mitochondrial recessive ataxia syndrome (MIRAS) resulting from mutation of the nuclear gene POLG, which has emerged as a major cause of mitochondrial disease. Common clinical features of mitochondrial disease – whether involving a mitochondrial or nuclear gene – include ptosis, external ophthalmoplegia, proximal myopathy and exercise intolerance, cardiomyopathy, sensorineural deafness, optic atrophy, pigmentary retinopathy, and diabetes mellitus. Common central nervous system findings are fluctuating encephalopathy, seizures, dementia, migraine, stroke-like episodes, ataxia, and spasticity. A high incidence of mid- and late pregnancy loss is a common occurrence that often goes unrecognized. [from GTR]

MedGen UID:
155901
Concept ID:
C0751651
Disease or Syndrome
3.

Sensory ataxia

Incoordination of movement caused by a deficit in the sensory nervous system. Sensory ataxia can be distinguished from cerebellar ataxia by asking the patient to close his or her eyes. Persons with cerebellar ataxia show only a minimal worsening of symptoms, whereas persons with sensory ataxia show a marked worsening of symptoms. [from HPO]

MedGen UID:
66020
Concept ID:
C0240991
Sign or Symptom
4.

External ophthalmoplegia

Paralysis of the external ocular muscles. [from HPO]

MedGen UID:
57662
Concept ID:
C0162292
Disease or Syndrome
5.

Ophthalmoplegia

Paralysis of one or more extraocular muscles that are responsible for eye movements. [from HPO]

MedGen UID:
45205
Concept ID:
C0029089
Sign or Symptom
6.

Seizures

Clinical or subclinical disturbances of cortical function due to a sudden, abnormal, excessive, and disorganized discharge of brain cells. Clinical manifestations include abnormal motor, sensory and psychic phenomena. Recurrent seizures are usually referred to as EPILEPSY or "seizure disorder." [from MeSH]

MedGen UID:
20693
Concept ID:
C0036572
Sign or Symptom
7.

Ataxia

A type of ataxia characterized by the impairment of the ability to smoothly perform the elements of a voluntary movement in the appropriate order and speed. With dyssynergia, a voluntary movement appears broken down into its component parts. [from HPO]

MedGen UID:
13945
Concept ID:
C0004134
Sign or Symptom
8.

Amino acid

Any organic compounds containing amino (-NH2) and carboxyl (-COOH) groups. In biochemistry, used to refer to the twenty-plus L-alpha-amino acids found in proteins. [from NCI]

MedGen UID:
250
Concept ID:
C0002520
Amino Acid, Peptide, or Protein; Biologically Active Substance; Pharmacologic Substance
9.

progressive

MedGen UID:
851455
Concept ID:
CN232553
Finding
10.

Seizures

MedGen UID:
851405
Concept ID:
CN232558
Disease or Syndrome
11.

Ptosis

MedGen UID:
833459
Concept ID:
CN207031
Finding
12.

Absence

MedGen UID:
739164
Concept ID:
C1689985
Anatomical Abnormality
13.

Myopathy

A disorder of muscle unrelated to impairment of innervation or neuromuscular junction. [from HPO]

MedGen UID:
505479
Concept ID:
CN002886
Finding
14.

Progressive external ophthalmoplegia

Initial bilateral ptosis followed by limitation of eye movements in all directions and slowing of saccades. [from HPO]

MedGen UID:
504513
Concept ID:
CN000553
Finding
15.

Peripheral neuropathy

A disorder affecting the cranial nerves or the peripheral nervous system. It manifests with pain, tingling, numbness, and muscle weakness. It may be the result of physical injury, toxic substances, viral diseases, diabetes, renal failure, cancer, and drugs. [from NCI]

MedGen UID:
141046
Concept ID:
C0442874
Disease or Syndrome
16.

Possible

Capable of happening or occurring. [from NCI]

MedGen UID:
137646
Concept ID:
C0332149
Finding
17.

Mutant

An altered form of an individual, organism, population, or genetic character that differs from the corresponding wild type due to one or more alterations (mutations). [from NCI]

MedGen UID:
109303
Concept ID:
C0596988
Cell or Molecular Dysfunction
18.

Chronic

Slow, creeping onset, slow progress and long continuance of disease manifestations. [from HPO]

MedGen UID:
104657
Concept ID:
C0205191
Temporal Concept
19.

Progressive external ophthalmoplegia

Progressive external ophthalmoplegia is a condition characterized by weakness of the eye muscles. The condition typically appears in adults between ages 18 and 40 and slowly worsens over time. The first sign of progressive external ophthalmoplegia is typically drooping eyelids (ptosis), which can affect one or both eyelids. As ptosis worsens, affected individuals may use the forehead muscles to try to lift the eyelids, or they may lift up their chin in order to see. Another characteristic feature of progressive external ophthalmoplegia is weakness or paralysis of the muscles that move the eye (ophthalmoplegia). Affected individuals have to turn their head to see in different directions, especially as the ophthalmoplegia worsens. People with progressive external ophthalmoplegia may also have general weakness of the muscles used for movement (myopathy), particularly those in the neck, arms, or legs. The weakness may be especially noticeable during exercise (exercise intolerance). Muscle weakness may also cause difficulty swallowing (dysphagia).When the muscle cells of affected individuals are stained and viewed under a microscope, these cells usually appear abnormal. These abnormal muscle cells contain an excess of cell structures called mitochondria and are known as ragged-red fibers.Although muscle weakness is the primary symptom of progressive external ophthalmoplegia, this condition can be accompanied by other signs and symptoms. In these instances, the condition is referred to as progressive external ophthalmoplegia plus (PEO+). Additional signs and symptoms can include hearing loss caused by nerve damage in the inner ear (sensorineural hearing loss), weakness and loss of sensation in the limbs due to nerve damage (neuropathy), impaired muscle coordination (ataxia), a pattern of movement abnormalities known as parkinsonism, and depression.Progressive external ophthalmoplegia is part of a spectrum of disorders with overlapping signs and symptoms. Similar disorders include ataxia neuropathy spectrum and Kearns-Sayre syndrome. Like progressive external ophthalmoplegia, the other conditions in this spectrum can involve weakness of the eye muscles. However, these conditions have many additional features not shared by most people with progressive external ophthalmoplegia. [from GTR]

MedGen UID:
102439
Concept ID:
C0162674
Disease or Syndrome
20.

Unrelated

Not connected or associated e.g. by kinship. [from NCI]

MedGen UID:
99027
Concept ID:
C0445356
Finding
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