CHMP4B, a novel gene for autosomal dominant cataracts linked to chromosome 20q

Alan Shiels, Thomas M. Bennett, Harry L.S. Knopf, Koki Yamada, Koh Ichiro Yoshiura, Norio Niikawa, Soomin Shim, Phyllis I. Hanson

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Abstract

Cataracts are a clinically diverse and genetically heterogeneous disorder of the crystalline lens and a leading cause of visual impairment. Here we report linkage of autosomal dominant "progressive childhood posterior subcapsular" cataracts segregating in a white family to short tandem repeat (STR) markers D20S847 (LOD score [Z] 5.50 at recombination fraction [θ] 0.0) and D20S195 (Z = 3.65 at θ = 0.0) on 20q, and identify a refined disease interval (rs2057262-(3.8 Mb)-rs1291139) by use of single-nucleotide polymorphism (SNP) markers. Mutation profiling of positional-candidate genes detected a heterozygous transversion (c.386A→T) in exon 3 of the gene for chromatin modifying protein-4B (CHMP4B) that was predicted to result in the nonconservative substitution of a valine residue for a phylogenetically conserved aspartic acid residue at codon 129 (p.D129V). In addition, we have detected a heterozygous transition (c.481G→A) in exon 3 of CHMP4B cosegregating with autosomal dominant posterior polar cataracts in a Japanese family that was predicted to result in the missense substitution of lysine for a conserved glutamic acid residue at codon 161 (p.E161K). Transfection studies of cultured cells revealed that a truncated form of recombinant D129V-CHMP4B had a different subcellular distribution than wild type and an increased capacity to inhibit release of virus-like particles from the cell surface, consistent with deleterious gain-of-function effects. These data provide the first evidence that CHMP4B, which encodes a key component of the endosome sorting complex required for the transport-III (ESCRT-III) system of mammalian cells, plays a vital role in the maintenance of lens transparency.

Original languageEnglish
Pages (from-to)596-606
Number of pages11
JournalAmerican journal of human genetics
Volume81
Issue number3
DOIs
StatePublished - Sep 2007

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    Shiels, A., Bennett, T. M., Knopf, H. L. S., Yamada, K., Yoshiura, K. I., Niikawa, N., Shim, S., & Hanson, P. I. (2007). CHMP4B, a novel gene for autosomal dominant cataracts linked to chromosome 20q. American journal of human genetics, 81(3), 596-606. https://doi.org/10.1086/519980