Id |
Subject |
Object |
Predicate |
Lexical cue |
T1 |
0-89 |
Sentence |
denotes |
Genetic homogeneity for inherited congenital microcoria loci in an Asian Indian pedigree. |
T2 |
90-98 |
Sentence |
denotes |
PURPOSE: |
T3 |
99-241 |
Sentence |
denotes |
Congenital microcoria is a rare autosomal dominant developmental disorder of the iris associated with myopia and juvenile open angle glaucoma. |
T4 |
242-339 |
Sentence |
denotes |
Linkage to the chromosomal locus 13q31-q32 has previously been reported in a large French family. |
T5 |
340-562 |
Sentence |
denotes |
In the current study, a three generation Asian Indian family with 15 congenital microcoria (pupils with a diameter <2 mm) affected members was studied for linkage to candidate microsatellite markers at the 13q31-q32 locus. |
T6 |
563-571 |
Sentence |
denotes |
METHODS: |
T7 |
572-661 |
Sentence |
denotes |
Twenty-four members of the family were clinically examined and genomic DNA was extracted. |
T8 |
662-803 |
Sentence |
denotes |
Microsatellite markers at 13q31-q32 were PCR amplified and run on an ABI Prism 310 genetic analyzer and genotyped with the GeneScan analysis. |
T9 |
804-900 |
Sentence |
denotes |
Two point and multipoint linkage analyses were performed using the MLINK and SUPERLINK programs. |
T10 |
901-909 |
Sentence |
denotes |
RESULTS: |
T11 |
910-1032 |
Sentence |
denotes |
Peak two point LOD scores of 3.5, 4.7, and 5.3 were found co-incident with consecutive markers D13S154, DCT, and D13S1280. |
T12 |
1033-1241 |
Sentence |
denotes |
Multipoint analysis revealed a 4 cM region encompassing D13S1300 to D13S1280 where the LOD remains just over 6.0 Thus we confirm localization of the congenital microcoria locus to chromosomal locus 13q31-q32. |
T13 |
1242-1390 |
Sentence |
denotes |
In addition, eight individuals who had both microcoria and glaucoma were screened for glaucoma genes: myocilin (MYOC), optineurin (OPTN) and CYP1B1. |
T14 |
1391-1619 |
Sentence |
denotes |
Using direct sequencing a point mutation (144 G>A) resulting in a Q48H substitution in exon 1 of the MYOC gene was observed in five of the eight glaucoma patients, but not in unaffected family members and 100 unrelated controls. |
T15 |
1620-1632 |
Sentence |
denotes |
CONCLUSIONS: |
T16 |
1633-1861 |
Sentence |
denotes |
We have confirmed the localization of the congenital microcoria locus (MCOR) to 13q31-q32 in a large Asian Indian family and conclude that current information suggests this is a single locus disorder and genetically homogeneous. |
T17 |
1862-2005 |
Sentence |
denotes |
When combined with the initial linkage paper our haplotype and linkage data map the MCOR locus to a 6-7 cM region between D13S265 and D13S1280. |
T18 |
2006-2105 |
Sentence |
denotes |
The DCT locus, a member of the tyrosinase family involved in pigmentation, maps within this region. |
T19 |
2106-2372 |
Sentence |
denotes |
Data presented here supports the hypothesis that congenital microcoria is a potential risk factor for glaucoma, although this observation is complicated by the partial segregation of MYOC Q48H (1q24.3-q25.2), a mutation known to be associated with glaucoma in India. |
T20 |
2373-2550 |
Sentence |
denotes |
Fine mapping and candidate gene analysis continues with the hope that characterizing the micocoria gene will lead to a better understanding of microcoria and glaucoma causation. |
T21 |
2551-2653 |
Sentence |
denotes |
The relationship between microcoria, glaucoma, and the MYOC Q48H mutation in this family is discussed. |