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Intellectual disability syndromic and non-syndromic v0.3050 HPDL Zornitza Stark changed review comment from: Intellectual impairment is variable, ranging from poor visual contact with inability to walk or speak to milder intellectual disability with the ability to say some words.; to: 17 individuals from 13 families, with a spectrum of neurologic impairment ranging from a severe congenital form without any neurological development (n = 2/17, 12%) to infantile-onset presentations (n = 10/17, 59%) with moderate to severe neurodevelopmental issues, partly with a pathology reminiscent of mitochondrial disease (Leigh-like syndrome), to juvenile-onset spastic paraplegia (n = 5/17, 29%).

Intellectual impairment is variable, ranging from poor visual contact with inability to walk or speak to milder intellectual disability with the ability to say some words.

Frequently observed additional clinical findings included chronic progression of neurological signs (n = 16/17, 94%), microcephaly (n = 9/16, 56%), and seizures/epilepsy (n = 9/17, 53%). Other relevant clinical findings were visual disturbances/strabismus (n = 9/17, 53%) and loss of developmental milestones (n = 6/17, 35%).

Acute central respiratory failure leading to life-threatening events requiring partly mechanically assisted ventilation occurred in half of individuals with infantile presentation (n = 5/10, 50%), respectively one third of all individuals (n = 5/17, 29%).

Demyelinating neuropathy was present in three individuals (n = 3/11, 27%), with reduced sensory nerve conduction velocity (NCV) in all and severely reduced motor NCV in one.
Intellectual disability syndromic and non-syndromic v0.3050 HPDL Zornitza Stark Phenotypes for gene: HPDL were changed from Progressive neurological disorder; Leigh-like syndrome to Neurodevelopmental disorder with progressive spasticity and brain white matter abnormalities (NEDSWMA), MIM#619026; Progressive neurological disorder; Leigh-like syndrome
Intellectual disability syndromic and non-syndromic v0.3049 HPDL Zornitza Stark reviewed gene: HPDL: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Neurodevelopmental disorder with progressive spasticity and brain white matter abnormalities (NEDSWMA), MIM#619026; Mode of inheritance: None
Intellectual disability syndromic and non-syndromic v0.2813 HPDL Zornitza Stark Marked gene: HPDL as ready
Intellectual disability syndromic and non-syndromic v0.2813 HPDL Zornitza Stark Gene: hpdl has been classified as Green List (High Evidence).
Intellectual disability syndromic and non-syndromic v0.2813 HPDL Zornitza Stark Phenotypes for gene: HPDL were changed from Progressive neurological disorder to Progressive neurological disorder; Leigh-like syndrome
Intellectual disability syndromic and non-syndromic v0.2812 HPDL Zornitza Stark Classified gene: HPDL as Green List (high evidence)
Intellectual disability syndromic and non-syndromic v0.2812 HPDL Zornitza Stark Gene: hpdl has been classified as Green List (High Evidence).
Intellectual disability syndromic and non-syndromic v0.2811 HPDL Crystle Lee gene: HPDL was added
gene: HPDL was added to Intellectual disability syndromic and non-syndromic. Sources: Expert Review
Mode of inheritance for gene: HPDL was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: HPDL were set to 32707086
Phenotypes for gene: HPDL were set to Progressive neurological disorder
Review for gene: HPDL was set to GREEN
Added comment: Biallelic variants reported in 13 families with a neurodegenerative disease ranging from neonatal encephalopathy to adolescent-onset spastic paraplegia
Sources: Expert Review