Abstract
A severe form of autosomal recessive retinitis pigmentosa (arRP) was identified in a large Pakistani family ascertained in the Punjab province of Pakistan. All affected individuals in the family had night blindness in early childhood, early complete loss of useful vision, and typical RP fundus changes plus macular degeneration. After exclusion of known arRP loci, a genome-wide scan was performed using microsatellite markers at about 10 cM intervals and calculating two-point lod scores. PCR cycle dideoxynucleotide sequencing was used to sequence candidate genes inside the linked region for mutations. RP in this family shows linkage to markers in a 10.5 cM (8.9 Mbp) region of chromosome 1p13.3–p21.2 between D1S2896 and D1S457. D1S485 yields the highest lod score of 6.54 at θ=0. Sequencing the exons and intron–exon boundaries of five candidate genes and six ESTs in this region, OLFM3, GNAI3, LOC126987, FLJ25070, DKFZp586G0123, AV729694, BU662869, BU656110, BU171991, BQ953690, and CA397743, did not identify any causative mutations. This novel locus lies approximately 4.9 cM (7.1 Mbp) from ABCA4, which is excluded from the linked region. Identification and study of this gene may help to elucidate the phenotypic diversity of arRP mapping to this region.
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Acknowledgements
We are grateful to the families for their participation in this study. We sincerely thank the staff of Lyton Rehmatullah Benevolent Trust (LRBT) Hospital and in particular Dr. Z. A. Qazi and Dr. M. Amer for the identification of the families, their expert clinical evaluation of affected individual and for other help. We also thank Dr. Xiaodong Jiao, Ms. Afshan Yasmeen, Mr. M. Awais and Mr. Amer Niazi for their technical help. A part of the study carried out in Pakistan was supported by Higher Education Commission, Islamabad, Pakistan and Ministry of Science & Technology, Islamabad, Pakistan. Dr. Qingjiong Zhang gratefully acknowledges the support from the National 863 Plan of China (Z19-01-04-02).
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Qingjiong Zhang, Fareeha Zulfiqar, Xueshan Xiao, Sheikh Riazuddin and J. Fielding Hejtmancik have contributed equally to this manuscript.
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Zhang, Q., Zulfiqar, F., Xiao, X. et al. Severe autosomal recessive retinitis pigmentosa maps to chromosome 1p13.3–p21.2 between D1S2896 and D1S457 but outside ABCA4. Hum Genet 118, 356–365 (2005). https://doi.org/10.1007/s00439-005-0054-4
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DOI: https://doi.org/10.1007/s00439-005-0054-4