Ectopia lentis in a consanguineous pakistani family and a novel locus on chromosome 8q.
OBJECTIVE
To investigate the genetic basis and molecular characteristics of the isolated form of ectopia lentis.


METHODS
We ascertained a consanguineous Pakistani family with multiple individuals with ectopia lentis. All affected as well as unaffected members with isolated ectopia lentis underwent detailed ophthalmologic and medical examination. Blood samples were collected and DNA was extracted. A genome-wide scan was completed with 382 polymorphic microsatellite markers, and logarithm of odds (LOD) scores were calculated.


RESULTS
Maximum 2-point LOD scores of 5.68 and 2.88 at theta = 0 were obtained for markers D8S285 and D8S260, respectively, during the genome-wide scan. Additional microsatellite markers refined the disease locus to a 16.96-cM (14.07-Mb) interval flanked by D8S1737 proximally and D8S1117 distally.


CONCLUSIONS
We report on a new locus for nonsyndromic autosomal recessive ectopia lentis on chromosome 8q11.23-q13.2 in a consanguineous Pakistani family. Clinical Relevance Identification of genetic loci and genes involved in ectopia lentis will enhance our understanding of the disease at a molecular level, leading to better genetic counseling and family screening and possible future development of better treatment.
Kaul
Haiba
H
National Centre of Excellence in Molecular Biology, University of the Punjab, Lahore, Pakistan.
Riazuddin
S Amer
SA
Qazi
Zaheeruddin A
ZA
Nasir
Idrees A
IA
Zafar
Ahmad U
AU
Khan
Shaheen N
SN
Husnain
Tayyab
T
Akram
Javed
J
Hejtmancik
J Fielding
JF
Riazuddin
Sheikh
S
D002898:Chromosomes, Human, Pair 8 / Q000235:genetics*; D003241:Consanguinity; D004479:Ectopia Lentis / Q000235:genetics*; D005260:Female; D008040:Genetic Linkage; D055106:Genome-Wide Association Study; D005838:Genotype; D006801:Humans; D008126:Lod Score; D008297:Male; D018895:Microsatellite Repeats; D010154:Pakistan; D010375:Pedigree; D016133:Polymerase Chain Reaction