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Maculopathy and adult-onset ataxia in patients with biallelic MFSD8 variants

Dobloug, Sigurd LU ; Kjellström, Ulrika LU ; Anderson, Glenn ; Gardner, Emily ; Mole, Sara E. ; Sheth, Jayesh and Puschmann, Andreas LU orcid (2024) In Molecular Genetics and Genomic Medicine 12(8).
Abstract

Background: Biallelic variants in the major facilitator superfamily domain containing 8 gene (MFSD8) are associated with distinct clinical presentations that range from typical late-infantile neuronal ceroid lipofuscinosis type 7 (CLN7 disease) to isolated adult-onset retinal dystrophy. Classic late-infantile CLN7 disease is a severe, rare neurological disorder with an age of onset typically between 2 and 6 years, presenting with seizures and/or cognitive regression. Its clinical course is progressive, leading to premature death, and often includes visual loss due to severe retinal dystrophy. In rare cases, pathogenic variants in MFSD8 can be associated with isolated non-syndromic macular dystrophy with variable age at onset, in which... (More)

Background: Biallelic variants in the major facilitator superfamily domain containing 8 gene (MFSD8) are associated with distinct clinical presentations that range from typical late-infantile neuronal ceroid lipofuscinosis type 7 (CLN7 disease) to isolated adult-onset retinal dystrophy. Classic late-infantile CLN7 disease is a severe, rare neurological disorder with an age of onset typically between 2 and 6 years, presenting with seizures and/or cognitive regression. Its clinical course is progressive, leading to premature death, and often includes visual loss due to severe retinal dystrophy. In rare cases, pathogenic variants in MFSD8 can be associated with isolated non-syndromic macular dystrophy with variable age at onset, in which the disease process predominantly or exclusively affects the cones of the macula and where there are no neurological or neuropsychiatric manifestations. Methods: Here we present longitudinal studies on four adult-onset patients who were biallelic for four MFSD8 variants. Results: Two unrelated patients who presented with adult-onset ataxia and had macular dystrophy on examination were homozygous for a novel variant in MFSD8 NM_152778.4: c.935T>C p.(Ile312Thr). Two other patients presented in adulthood with visual symptoms, and one of these developed mild to moderate cerebellar ataxia years after the onset of visual symptoms. Conclusions: Our observations expand the knowledge on biallelic pathogenic MFSD8 variants and confirm that these are associated with a spectrum of more heterogeneous clinical phenotypes. In MFSD8-related disease, adult-onset recessive ataxia can be the presenting manifestation or may occur in combination with retinal dystrophy.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ataxia, CLN7, MFSD8, NCL7, neuronal ceroid lipofuscinosis, retinal degeneration
in
Molecular Genetics and Genomic Medicine
volume
12
issue
8
article number
e2505
publisher
John Wiley & Sons Inc.
external identifiers
  • scopus:85200696510
  • pmid:39108195
ISSN
2324-9269
DOI
10.1002/mgg3.2505
language
English
LU publication?
yes
id
e3de2599-0b2b-4765-b03f-59b8492b8f01
date added to LUP
2024-09-06 13:40:53
date last changed
2024-09-20 14:47:52
@article{e3de2599-0b2b-4765-b03f-59b8492b8f01,
  abstract     = {{<p>Background: Biallelic variants in the major facilitator superfamily domain containing 8 gene (MFSD8) are associated with distinct clinical presentations that range from typical late-infantile neuronal ceroid lipofuscinosis type 7 (CLN7 disease) to isolated adult-onset retinal dystrophy. Classic late-infantile CLN7 disease is a severe, rare neurological disorder with an age of onset typically between 2 and 6 years, presenting with seizures and/or cognitive regression. Its clinical course is progressive, leading to premature death, and often includes visual loss due to severe retinal dystrophy. In rare cases, pathogenic variants in MFSD8 can be associated with isolated non-syndromic macular dystrophy with variable age at onset, in which the disease process predominantly or exclusively affects the cones of the macula and where there are no neurological or neuropsychiatric manifestations. Methods: Here we present longitudinal studies on four adult-onset patients who were biallelic for four MFSD8 variants. Results: Two unrelated patients who presented with adult-onset ataxia and had macular dystrophy on examination were homozygous for a novel variant in MFSD8 NM_152778.4: c.935T&gt;C p.(Ile312Thr). Two other patients presented in adulthood with visual symptoms, and one of these developed mild to moderate cerebellar ataxia years after the onset of visual symptoms. Conclusions: Our observations expand the knowledge on biallelic pathogenic MFSD8 variants and confirm that these are associated with a spectrum of more heterogeneous clinical phenotypes. In MFSD8-related disease, adult-onset recessive ataxia can be the presenting manifestation or may occur in combination with retinal dystrophy.</p>}},
  author       = {{Dobloug, Sigurd and Kjellström, Ulrika and Anderson, Glenn and Gardner, Emily and Mole, Sara E. and Sheth, Jayesh and Puschmann, Andreas}},
  issn         = {{2324-9269}},
  keywords     = {{ataxia; CLN7; MFSD8; NCL7; neuronal ceroid lipofuscinosis; retinal degeneration}},
  language     = {{eng}},
  number       = {{8}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Molecular Genetics and Genomic Medicine}},
  title        = {{Maculopathy and adult-onset ataxia in patients with biallelic MFSD8 variants}},
  url          = {{http://dx.doi.org/10.1002/mgg3.2505}},
  doi          = {{10.1002/mgg3.2505}},
  volume       = {{12}},
  year         = {{2024}},
}