Human Genetics

, Volume 128, Issue 4, pp 365–371 | Cite as

A homozygous mutation in LTBP2 causes isolated microspherophakia

  • Arun Kumar
  • Maheswara R. Duvvari
  • Venkatesh C. Prabhakaran
  • Jyoti S. Shetty
  • Gowri J. Murthy
  • Susan H. Blanton
Original Investigation

Abstract

Microspherophakia is an autosomal-recessive congenital disorder characterized by small spherical lens. It may be isolated or occur as part of a hereditary systemic disorder, such as Marfan syndrome, autosomal dominant and recessive forms of Weill-Marchesani syndrome, autosomal dominant glaucoma–lens ectopia–microspherophakia–stiffness–shortness syndrome, autosomal dominant microspherophakia with hernia, and microspherophakia-metaphyseal dysplasia. The purpose of this study was to map and identify the gene for isolated microspherophakia in two consanguineous Indian families. Using a whole-genome linkage scan in one family, we identified a likely locus for microspherophakia (MSP1) on chromosome 14q24.1–q32.12 between markers D14S588 and D14S1050 in a physical distance of 22.76 Mb. The maximum multi-point lod score was 2.91 between markers D14S1020 and D14S606. The MSP1 candidate region harbors 110 reference genes. DNA sequence analysis of one of the genes, LTBP2, detected a homozygous duplication (insertion) mutation, c.5446dupC, in the last exon (exon 36) in affected family members. This homozygous mutation is predicted to elongate the LTBP2 protein by replacing the last 6 amino acids with 27 novel amino acids. Microspherophakia in the second family did not map to this locus, suggesting genetic heterogeneity. The present study suggests a role for LTBP2 in the structural stability of ciliary zonules, and growth and development of lens.

Supplementary material

439_2010_858_MOESM1_ESM.doc (87 kb)
Supplementary material (DOC 87 kb)

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Arun Kumar
    • 1
  • Maheswara R. Duvvari
    • 1
  • Venkatesh C. Prabhakaran
    • 2
  • Jyoti S. Shetty
    • 3
  • Gowri J. Murthy
    • 4
  • Susan H. Blanton
    • 5
  1. 1.Department of Molecular Reproduction, Development and GeneticsIndian Institute of ScienceBangaloreIndia
  2. 2.Minto Ophthalmic HospitalBangaloreIndia
  3. 3.Bangalore West Lions Superspecialty Eye HospitalBangaloreIndia
  4. 4.Prabha Eye ClinicBangaloreIndia
  5. 5.Miami Institute for Human GenomicsUniversity of Miami Miller School of MedicineMiamiUSA

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