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Mutations in the polyglutamylase gene TTLL5, expressed in photoreceptor cells and spermatozoa, are associated with cone-rod degeneration and reduced male fertility

Bedoni, Nicola; Haer-Wigman, Lonneke; Vaclavik, Veronika; Tran, Viet H.; Farinelli, Pietro; Balzano, Sara; Royer-Bertrand, Beryl; El-Asrag, Mohammed E.; Bonny, Olivier and Ikonomidis, Christos, et al. (2016) In Human Molecular Genetics 25(20). p.4546-4555
Abstract

Hereditary retinal degenerations encompass a group of genetic diseases characterized by extreme clinical variability. Following next-generation sequencing and autozygome-based screening of patients presenting with a peculiar, recessive form of cone-dominated retinopathy, we identified five homozygous variants [p.(Asp594fs), p.(Gln117*), p.(Met712fs), p.(Ile756Phe), and p.(Glu543Lys)] in the polyglutamylase-encoding gene TTLL5, in eight patients from six families. The two male patients carrying truncating TTLL5 variants also displayed a substantial reduction in sperm motility and infertility, whereas those carrying missense changes were fertile. Defects in this polyglutamylase in humans have recently been associated with cone... (More)

Hereditary retinal degenerations encompass a group of genetic diseases characterized by extreme clinical variability. Following next-generation sequencing and autozygome-based screening of patients presenting with a peculiar, recessive form of cone-dominated retinopathy, we identified five homozygous variants [p.(Asp594fs), p.(Gln117*), p.(Met712fs), p.(Ile756Phe), and p.(Glu543Lys)] in the polyglutamylase-encoding gene TTLL5, in eight patients from six families. The two male patients carrying truncating TTLL5 variants also displayed a substantial reduction in sperm motility and infertility, whereas those carrying missense changes were fertile. Defects in this polyglutamylase in humans have recently been associated with cone photoreceptor dystrophy, while mouse models carrying truncating mutations in the same gene also display reduced fertility in male animals. We examined the expression levels of TTLL5 in various human tissues and determined that this gene has multiple viable isoforms, being highly expressed in testis and retina. In addition, antibodies against TTLL5 stained the basal body of photoreceptor cells in rat and the centrosome of the spermatozoon flagellum in humans, suggesting a common mechanism of action in these two cell types. Taken together, our data indicate that mutations in TTLL5 delineate a novel, allele-specific syndrome causing defects in two as yet pathogenically unrelated functions, reproduction and vision.

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@article{3905c59d-05f9-4354-8996-01f6e5eaecac,
  abstract     = {<p>Hereditary retinal degenerations encompass a group of genetic diseases characterized by extreme clinical variability. Following next-generation sequencing and autozygome-based screening of patients presenting with a peculiar, recessive form of cone-dominated retinopathy, we identified five homozygous variants [p.(Asp594fs), p.(Gln117*), p.(Met712fs), p.(Ile756Phe), and p.(Glu543Lys)] in the polyglutamylase-encoding gene TTLL5, in eight patients from six families. The two male patients carrying truncating TTLL5 variants also displayed a substantial reduction in sperm motility and infertility, whereas those carrying missense changes were fertile. Defects in this polyglutamylase in humans have recently been associated with cone photoreceptor dystrophy, while mouse models carrying truncating mutations in the same gene also display reduced fertility in male animals. We examined the expression levels of TTLL5 in various human tissues and determined that this gene has multiple viable isoforms, being highly expressed in testis and retina. In addition, antibodies against TTLL5 stained the basal body of photoreceptor cells in rat and the centrosome of the spermatozoon flagellum in humans, suggesting a common mechanism of action in these two cell types. Taken together, our data indicate that mutations in TTLL5 delineate a novel, allele-specific syndrome causing defects in two as yet pathogenically unrelated functions, reproduction and vision.</p>},
  author       = {Bedoni, Nicola and Haer-Wigman, Lonneke and Vaclavik, Veronika and Tran, Viet H. and Farinelli, Pietro and Balzano, Sara and Royer-Bertrand, Beryl and El-Asrag, Mohammed E. and Bonny, Olivier and Ikonomidis, Christos and Litzistorf, Yan and Nikopoulos, Konstantinos and Yioti, Georgia G. and Stefaniotou, Maria I. and McKibbin, Martin and Booth, Adam P. and Ellingford, Jamie M. and Black, Graeme C. M. and Toomes, Carmel and Inglehearn, Chris F. and Hoyng, Carel B. and Bax, Nathalie and Klaver, Caroline C. W. and Thiadens, Alberta A. and Murisier, Fabien and Schorderet, Daniel F. and Ali, Manir and Cremers, Frans P M and Andréasson, Sten and Munier, Francis L. and Rivolta, Carlo},
  issn         = {0964-6906},
  language     = {eng},
  number       = {20},
  pages        = {4546--4555},
  publisher    = {Oxford University Press},
  series       = {Human Molecular Genetics},
  title        = {Mutations in the polyglutamylase gene TTLL5, expressed in photoreceptor cells and spermatozoa, are associated with cone-rod degeneration and reduced male fertility},
  volume       = {25},
  year         = {2016},
}