Compound heterozygous aspm mutations in pakistani MCPH families

Farooq Muhammad, Shahid Mahmood Baig, Lars Hansen, Muhammad Sajid Hussain, Iram Anjum Inayat, Muhammad Aslam, Javed Anver Qureshi, Muhammad Toilat, Elisabeth Kirst, Muhammad Wajid, Peter Nurnberg, Hans Eiberg, Niels Tommerup, Klaus W. Kjaer

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Autosomal recessive primary microcephaly (MCPH) is characterized by reduced head circumference (<4 SD) and mental retardation without any other neurological manifestation. Of the four identified MCPH genes, homozygous truncating mutations in ASPM (MCPH5) account for >50% of all reported families. In spite of the high frequency of MCPH in Pakistan only one case of compound heterozygosity for mutations in ASPM has been reported yet. In this large MCPH study we ascertained 37 families including 319 persons (140 patients). Haplotype analysis of eight STS markers suggested linkage by homozygosity in 20 families, and re-analysis of single sib ships in the remaining families demonstrated possible compound het- erozygosity in two families. Direct sequencing indeed confirmed compound heterozygosity in two and homozygous mutations in 20 families, respectively, showing that up to 10% of families with MCPH caused by ASPM are compound heterozygous. In total we identified 16 different nonsense or frameshift mutations of which 12 were novel thereby increasing the number of mutations in ASPM significantly from 35 to 47. We found no correlation between the severity of the condition and the site of truncation. We suggest that the high frequency of compound heterozygosity observed in this study is taken into consideration as part of future genetic testing and counseling in Pakistani MCPH families.

Original languageEnglish
Pages (from-to)926-930
Number of pages5
JournalAmerican Journal of Medical Genetics, Part A
Volume149
Issue number5
DOIs
Publication statusPublished - May 2009
Externally publishedYes

Keywords

  • ASPM
  • Compound heterozygosity
  • MCPH5
  • Microcephaly
  • Seizures

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