A mutation in the FOXE3 gene causes congenital primary aphakia in an autosomal recessive consanguineous Pakistani family
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
A mutation in the FOXE3 gene causes congenital primary aphakia in an autosomal recessive consanguineous Pakistani family. / Anjum, Iram; Eiberg, Hans; Baig, Shahid Mahmood; Tommerup, Niels; Hansen, Lars.
In: Molecular Vision, Vol. 16, 03.2010, p. 549-55.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - A mutation in the FOXE3 gene causes congenital primary aphakia in an autosomal recessive consanguineous Pakistani family
AU - Anjum, Iram
AU - Eiberg, Hans
AU - Baig, Shahid Mahmood
AU - Tommerup, Niels
AU - Hansen, Lars
N1 - Keywords: Amino Acid Sequence; Aphakia; Base Sequence; Cataract; Consanguinity; DNA Mutational Analysis; Family; Female; Forkhead Transcription Factors; Genes, Recessive; Genetic Loci; Haplotypes; Homozygote; Humans; Lod Score; Male; Molecular Sequence Data; Mutation; Pakistan; Pedigree; Physical Chromosome Mapping
PY - 2010/3
Y1 - 2010/3
N2 - PURPOSE: Aphakia is the complete absence of any lens in the eye, either due to surgical removal of the lens as a result of a perforating wound or ulcer, or due to a congenital anomaly. The purpose of this study was to elucidate the molecular genetics for a large consanguineous Pakistani family with a clear aphakia phenotype. METHODS: The initial homozygosity screening of the family was extended to all the known autosomal recessive cataract loci in order to exclude the possibility of surgical cataract removal leading to aphakia. The screening was performed using polymorphic nucleotide repeat markers, followed by DNA sequencing of a possible candidate gene, the forkhead box protein E3 gene (FOXE3). The identified mutation was counter-checked by a diagnostic restriction enzyme digest of all the family members, and an analysis of the normal population. RESULTS: The initial homozygosity screening of 13 known autosomal recessive loci resulted in negative LOD (logarithm of odds) scores. The aphakia phenotype suggested a mutation in FOXE3 close to the AR-locus 1p34.3-p32.2, and sequence analyses revealed the nonsense mutation c.720C>A, changing cysteine 240 to a stop codon. Segregation in the family was shown by diagnostic restriction enzyme digest, and marker analysis of another aphakia family from Madagascar carrying the same mutation excluded the presence of a founder mutation. Clinical re-examination of the family was not possible due to the escalating security concerns and internal displacement of the population in this region of Pakistan which has prevailed for many months. CONCLUSIONS: FOXE3 is responsible for the early developmental arrest of the lens placode, and the complete loss of a functional FOXE3 protein results in primary aphakia. It can also be deduced that this mutation is quite primitive in origin since the same mutation is responsible for the same phenotypic outcome in two families of geographically different descent.
AB - PURPOSE: Aphakia is the complete absence of any lens in the eye, either due to surgical removal of the lens as a result of a perforating wound or ulcer, or due to a congenital anomaly. The purpose of this study was to elucidate the molecular genetics for a large consanguineous Pakistani family with a clear aphakia phenotype. METHODS: The initial homozygosity screening of the family was extended to all the known autosomal recessive cataract loci in order to exclude the possibility of surgical cataract removal leading to aphakia. The screening was performed using polymorphic nucleotide repeat markers, followed by DNA sequencing of a possible candidate gene, the forkhead box protein E3 gene (FOXE3). The identified mutation was counter-checked by a diagnostic restriction enzyme digest of all the family members, and an analysis of the normal population. RESULTS: The initial homozygosity screening of 13 known autosomal recessive loci resulted in negative LOD (logarithm of odds) scores. The aphakia phenotype suggested a mutation in FOXE3 close to the AR-locus 1p34.3-p32.2, and sequence analyses revealed the nonsense mutation c.720C>A, changing cysteine 240 to a stop codon. Segregation in the family was shown by diagnostic restriction enzyme digest, and marker analysis of another aphakia family from Madagascar carrying the same mutation excluded the presence of a founder mutation. Clinical re-examination of the family was not possible due to the escalating security concerns and internal displacement of the population in this region of Pakistan which has prevailed for many months. CONCLUSIONS: FOXE3 is responsible for the early developmental arrest of the lens placode, and the complete loss of a functional FOXE3 protein results in primary aphakia. It can also be deduced that this mutation is quite primitive in origin since the same mutation is responsible for the same phenotypic outcome in two families of geographically different descent.
M3 - Journal article
C2 - 20361012
VL - 16
SP - 549
EP - 555
JO - Molecular Vision
JF - Molecular Vision
SN - 1090-0535
ER -
ID: 20243255