Ophthalmological changes in hereditary spastic paraplegia and other genetic diseases with spastic paraplegia.

Ophthalmological abnormalities may occur in specific subtypes of hereditary spastic paraplegia (HSP) and in genetic diseases that present with spastic paraplegia mimicking HSP. These ophthalmological changes may precede the motor symptoms and include pigmentary retinal degeneration, ophthalmoplegia, optic atrophy, cataracts and nystagmus. Some ophthalmological abnormalities are more prevalent in specific forms of HSP. Considering that the diagnosis of HSP is usually difficult and complex, specific ophthalmological changes may guide the genetic testing. There are other genetic diseases such as autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS), X-linked adrenoleukodystrophy and spastic paraplegia, optic atrophy and neuropathy (SPOAN) that may mimic HSP and also may present with specific ophthalmological changes. In this article, we review the main ophthalmological changes observed in patients with HSP and HSP-like disorders.

Autonomic dysfunction in hereditary spastic paraplegia type 4.

BACKGROUND AND PURPOSE: SPAST mutations are the most common cause of hereditary spastic paraplegia (SPG4-HSP), which is characterized by progressive lower limb weakness, spasticity and hyperreflexia. There are few studies about non-motor manifestations in this disease and none about autonomic involvement. Therefore, the aim was to determine the frequency and pattern of autonomic complaints in patients with SPG4-HSP, as well as to determine the clinical relevance and the possible factors associated with these manifestations. METHODS: Thirty-four molecularly confirmed SPG4 patients were recruited in a multicenter cross-sectional study, of whom 26 underwent detailed neurophysiological testing (heart rate variability, sympathetic skin response and the Quantitative Sudomotor Axonal Reflex Test). The Scales for Outcomes in Parkinson's Disease - Autonomic Questionnaire (SCOPA-AUT) was applied to quantify the severity of autonomic symptoms. Results were compared with 44 age- and gender-matched healthy controls using non-parametric tests. P values <0.05 were considered significant. RESULTS: In the SPG4-HSP group, there were 18 men with a mean age of 47.7 ± 12.6 years. SCOPA-AUT scores were similar between patients and controls (P = 0.238). Only the urinary domain subscore was significantly higher amongst patients (4 vs. 2.5, P = 0.05). Absent sympathetic skin response in the hands and feet was more frequent amongst patients (20% vs. 0%, P < 0.001, and 64% vs. 0%, P = 0.006, respectively). Quantitative Sudomotor Axonal Reflex Test responses were also smaller throughout all recording regions in the SPG4-HSP group. CONCLUSION: Our results indicate that SPG4-HSP patients have sudomotor dysfunction caused by damaged small post-ganglionic cholinergic fibers. Damage in SPG4-HSP extends to the peripheral nervous system.

Nerve conduction studies in spastic paraplegia, optic atrophy, and neuropathy (SPOAN) syndrome.

INTRODUCTION: SPOAN (spastic paraplegia, optic atrophy, and neuropathy) syndrome is an autosomal recessive neurodegenerative disorder identified in a large consanguineous Brazilian family. METHODS: Twenty-seven patients with SPOAN syndrome (20 women), aged 4-58 years, underwent nerve conduction studies (NCS) of the median, ulnar, tibial, and fibular nerves, and sensory NCS of the median, ulnar, radial, sural, and superficial fibular nerves. RESULTS: Sensory nerve action potentials were absent in the lower limbs and absent in >80% of upper limbs. Motor NCS had reduced amplitudes and borderline velocities in the upper limbs and absent compound muscle action potentials (CMAPs) in the lower limbs. CONCLUSIONS: The neuropathy in SPOAN syndrome is a severe, early-onset sensory-motor axonal polyneuropathy. Normal NCS seem to rule-out this condition.

Spastic paraplegia, optic atrophy, and neuropathy: new observations, locus refinement, and exclusion of candidate genes.

SPOAN is an autosomal recessive neurodegenerative disorder which was recently characterized by our group in a large inbred Brazilian family with 25 affected individuals. This condition is clinically defined by: 1. congenital optic atrophy; 2. progressive spastic paraplegia with onset in infancy; and 3. progressive motor and sensory axonal neuropathy. Overall, we are now aware of 68 SPOAN patients (45 females and 23 males, with age ranging from 5 to 72 years), 44 of which are presented here for the first time. They were all born in the same geographic micro region. Those 68 patients belong to 43 sibships, 40 of which exhibit parental consanguinity. Sixty-one patients were fully clinically evaluated and 64 were included in the genetic investigation. All molecularly studied patients are homozygotes for D11S1889 at 11q13. This enabled us to reduce the critical region for the SPOAN gene from 4.8 to 2.3 Mb, with a maximum two point lod score of 33.2 (with marker D11S987) and of 27.0 (with marker D11S1889). Three genes located in this newly defined critical region were sequenced, but no pathogenic mutation was detected. The gene responsible for SPOAN remains elusive.

Expanding the neurologic phenotype of oculodentodigital dysplasia in a 4-generation Hispanic family.

We report a 4-generation Hispanic family with oculodentodigital dysplasia whose members were found to have typical phenotypic characteristics of this disorder, as well as a variable expression of neurologic manifestations in multiple generations ranging from a mild spastic gait to moderate to severe spastic tetraparesis/quadriplegia with epilepsy and an abnormal brain and spinal cord magnetic resonance imaging result. Gene testing documented a previously reported missense mutation in GJA1 (connexin 43) exon 2 (c.389T>C;p.I130T). Our evaluation not only expands the phenotypes associated with GJA1 gene mutations but also demonstrates that a great degree of variability in neurological defects can exist within a single family without evidence of genetic anticipation. A genotype-phenotype correlation between the p.I130T mutation and neurologic dysfunction appears more likely with the addition of this report's neurologic and GJA1 gene mutation findings. These findings expand the neurologic phenotype and prognosis and underscore the importance of counseling families with oculodentodigital dysplasia about the possibility of neurologic involvement.

Spastic paraplegia, optic atrophy, and neuropathy is linked to chromosome 11q13.

We report an autosomal recessive neurodegenerative disorder in 25 white members from a large inbred Brazilian family, 22 of whom were evaluated clinically. This condition is characterized by (1) subnormal vision secondary to apparently nonprogressive congenital optic atrophy; (2) onset of progressive spastic paraplegia in infancy; (3) onset of progressive motor and sensory axonal neuropathy in late childhood/early adolescence; (4) dysarthria starting in the third decade of life; (5) exacerbated acoustic startle response; and (6) progressive joint contractures and spine deformities. Motor handicap was severe, and all patients were wheelchair bound after 15 years old. We performed a genome-wide screen including 25 affected individuals and 49 of their unaffected relatives. Linkage was detected at 11q13 region with a maximum logarithm of odds score of +14.43, obtained with marker D11S1883. The candidate region, which lies between D11S1908 and D11S1889, encompasses approximately 4.8Mb and has more than 100 genes and expressed sequences. We propose the acronym SPOAN (spastic paraplegia, optic atrophy, and neuropathy) for this complex syndrome.

Brazilian family with pure autosomal dominant spastic paraplegia maps to 8q: analysis of muscle beta 1 syntrophin.

The autosomal dominant hereditary spastic paraplegias (AD-HSP) are a heterogeneous group of degenerative disorders of the central motor system, characterized by progressive spasticity of the lower limbs. Five loci for pure AD-HSP have been identified to date: SPG3 at 14q, SPG4 at 2p, SPG6 at 15q, SPG8 at 8q, and more recently SPG10 at 12q. We have analyzed a Brazilian family with 16 affected individuals by pure AD-HSP who developed progressive gait disturbance with onset at age 18-26 years. Linkage analysis performed with 13 relatives (6 affected and 7 normal) excluded SPG3, SPG4, and SPG6 as candidate regions. However, positive LOD scores were obtained with markers flanking the candidate region for the SPG8 locus [maximum two point Lod score (Zmax) = 3.3 at theta = 0 for D8S1804]. In this region lies the syntrophin beta 1 gene (SNT2B1), a widely expressed dystrophin-associated protein and therefore a good positional and functional candidate for this disease. Immunohistochemical and Western Blot (WB) studies showed that the distribution, expression, and apparent molecular weight of the beta 1 syntrophin protein were comparable to those of normal control individuals. Therefore, it is unlikely that defects in this protein are related to SPG8, at least in the present family.

The neuroepidemiology of tropical spastic paraparesis.

Recent neuroepidemiological studies of endemic tropical spastic paraparesis (TSP) have confirmed the existence of high-prevalence foci in several tropical islands, including Jamaica and Martinique in the Caribbean, Tumaco off the Pacific coast of Colombia, and the Seychelles in the Indian Ocean. There is a net preponderance of TSP in persons of Black African ancestry, although Caucasian, Hindu, Amerindian, and Orientals have been affected. The epidemiological, clinical, laboratory, and neuropathological features of TSP are reviewed here, as well as the evidence in favor of its retroviral origin.

Epidemiology of tropical spastic paraparesis in Columbia and associated HTLV-I infection.

The clinical syndrome earlier designated as paraparesia espástica del Pacífico is an isolated form of tropical spastic paraparesis (TSP) that was reported in 1981 in the southern Pacific lowlands of Columbia in and near Tumaco. The clinical features are similar to those of TSP reported in Jamaica, Martinique, the Seychelles, and the Ivory Coast of Africa and resemble also those clinical features of the human T-lymphotropic virus type I (HTLV-I)-associated myelopathy described in southern Japan. Since HTLV-I infection is closely associated with TSP, we conducted a case-control study to evaluate the role of HTLV-I-associated risk factors among patients from the endemic focus in Tumaco, Colombia, and the seroprevalence rates of this virus in other geographical areas of the Pacific Colombian lowlands with and without TSP. From our seroprevalence study of antibodies to HTLV-I among TSP index patients, matched controls, household contacts (first- and second-degree relatives), and healthy controls from these areas, we found a strong association between HTLV-I and TSP. Also, there is a high seroprevalence of HTLV-I among sexual partners of patients and to a lesser extent among their offspring and other relatives some of whom had an early mean acquisition of antibodies to HTLV-I. Heterosexual promiscuity and other close interpersonal contact may play an important role in the transmission of TSP in the Pacific lowlands of Colombia.

Paraplejia espástica e insuficiencia suprarrenal primaria: un caso de adrenomieloneuropatia / Spastic paraplegia and primary adrenal insuficiency: a case of adrenomyeloneuropathy

Un varón de 40 años se internó por dificultad creciente para la marcha que había comenzado 2 años antes y que lo había reducido a una silla o a la cama. Hacía 7 años se le había diagnosticado enfermedad de Addison y tomaba regularmente 20 mg/día de hidrocortisona oral. Su padre, un tío paterno y 2 hermanas están sanos; un hermano afectado por oligofrenia, disartria y dificultad para caminar falleció a los 9 años de edad. A su ingreso, el paciente estaba lúcido y orientado,; tenía hiperpigmentaciín leve de piel y mucosas, alopecía en cuero cabeludo y cola de cejas, testículos de 3,5 ml y paraplejía espástica; los miembros inferiores conservaban la sensibilidad táctil y dolorosa. La radiografía de tórax y la reacción de Mantoux eran normales. Las pruebas hormonales de laboratorio confirmaron la insuficiencia suprarrenal primaria (con conservación de la función de la zona glomerulosa) y un hipogonadismo primario; la función tiroidea era normal. La velocidad de conducción motora en miembros inferiores era baja (30-32 m/seg), con aumento de las latencias proximal y distal; esto y el EMG eran compatibles con polineuropatía de tipo mielinopático. Se comprobó leve atrofia cortical difusa (TAC) de cráneo); los potenciales evocados auditivos de tronco cerebral mostraron baja amplitud del complejo IV-V y tiempo de conducción central prolongado (5,3 mseg). Los ácidos grasos séricos eran cuantitativa y cualitativamente normales por cromatografía gaseosa. En la biopsia de nervio safeno se observó desmielinización segmentaria y degeneración axonal, sin infiltrados inflamatorios; el estudio ultraestructural demostró, en el citoplasma de algunas células de Schwann, inclusiones bilaminares, en su mayoría curvalíneas, que confirmaron el diagnósticos clínico de adrenomieloneuropatía. Esta rara enfermedad familiar de transmisión recesiva ligada al cromosoma X se origina en un trastorno del metabolismo de los ácidos grasos saturados de cadena muy larga, con compromiso funcional del sistema nervioso y de células productoras de hormonas esteroides

The neuroepidemiology of tropical spastic paraparesis

Recent neuroepidemiological studies of endemic tropical spastic paraparesis (TSP) have confirmed the existence of high-prevalence foci in several tropical islands, including Jamaica and Martinique in the Caribbean, Tumaco off the Pacific coast of Colombia, and the Seychelles in the Indian Ocean. There is a net preponderance of TSP in persons of Black African ancestry, although Caucasian, Hindu, Amerindian, and Orientals have been affected. The epidemiological, clinical, laboratory, and neuropathological features of TSP are reviewed here, as well as the evidence in favor of its retroviral origin. (AU)

Paraplejia espástica e insuficiencia suprarrenal primaria: un caso de adrenomieloneuropatia / Spastic paraplegia and primary adrenal insuficiency: a case of adrenomyeloneuropathy

Un varón de 40 años se internó por dificultad creciente para la marcha que había comenzado 2 años antes y que lo había reducido a una silla o a la cama. Hacía 7 años se le había diagnosticado enfermedad de Addison y tomaba regularmente 20 mg/día de hidrocortisona oral. Su padre, un tío paterno y 2 hermanas están sanos; un hermano afectado por oligofrenia, disartria y dificultad para caminar falleció a los 9 años de edad. A su ingreso, el paciente estaba lúcido y orientado,; tenía hiperpigmentaciín leve de piel y mucosas, alopecía en cuero cabeludo y cola de cejas, testículos de 3,5 ml y paraplejía espástica; los miembros inferiores conservaban la sensibilidad táctil y dolorosa. La radiografía de tórax y la reacción de Mantoux eran normales. Las pruebas hormonales de laboratorio confirmaron la insuficiencia suprarrenal primaria (con conservación de la función de la zona glomerulosa) y un hipogonadismo primario; la función tiroidea era normal. La velocidad de conducción motora en miembros inferiores era baja (30-32 m/seg), con aumento de las latencias proximal y distal; esto y el EMG eran compatibles con polineuropatía de tipo mielinopático. Se comprobó leve atrofia cortical difusa (TAC) de cráneo); los potenciales evocados auditivos de tronco cerebral mostraron baja amplitud del complejo IV-V y tiempo de conducción central prolongado (5,3 mseg). Los ácidos grasos séricos eran cuantitativa y cualitativamente normales por cromatografía gaseosa. En la biopsia de nervio safeno se observó desmielinización segmentaria y degeneración axonal, sin infiltrados inflamatorios; el estudio ultraestructural demostró, en el citoplasma de algunas células de Schwann, inclusiones bilaminares, en su mayoría curvalíneas, que confirmaron el diagnósticos clínico de adrenomieloneuropatía. Esta rara enfermedad familiar de transmisión recesiva ligada al cromosoma X se origina en un trastorno del metabolismo de los ácidos grasos saturados de cadena muy larga, con compromiso funcional del sistema nervioso y de células productoras de hormonas esteroides (AU)

[Familial spastic paraplegia. Genetic-scientific discussion apropos of an affected family]. / Paraplegia espástica familial. Discussao genético-científica a propósito de uma família de afetados.

Because of the genetic heterogeny of this condition, a family with two brothers affected by familial spastic paraplegia, descendent from a consaguinous marriage, is reported. The envolved hereditary transmission mechanism is discussed being concluded as possibly the autossomic recessive one.

[Familial spastic paraplegia with amyotrophy. Clinical, electromyographic, histochemical study and microdissection]. / Paraplegia espástica familiar com amiotrofia. Estudo clínico, eletromiografico, histoquímico e microdissecção.

Four cases of familial spastic paraplegia with amyotrophy in siblings from a consanguineous married are reported. The routine laboratory examination were normal. The electromiography and muscle biopsy processed by histochemistry showed signs of denervation with reinervation. The motor nerve conduction velocity was decreased in the peroneal nerve in 3 cases. The teased fiber preparation of sural nerves was abnormal in four cases. It was found increased of C, D and G fibers suggesting demyelination with secondary remyelination. The authors believe the abnormalities found could be due the distal axonal degeneration, with secondary regeneration and suggest the hypothesis that the fact is an axoplasmic flow defect in the central and peripheral nervous system.

Familial ichthyosis, dwarfism, mental retardation, and renal disease.

The nonrandom association of congenital ichthyosis with neurologic impairment, ectodermal dysplasia, dwarfism, hypogonadism, and renal disease has prompted the review of numerous syndromes. The difficulties in characterization of syndromes in the absence of pathognomonic signs is discussed in relation to three siblings presented herein. Despite extensive investigation, underlying metabolic defects remain obscure.