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Homozygosity mapping in families with Joubert syndrome identifies a locus on chromosome 9q34.3 and evidence for genetic heterogeneity.

Abstract：

:Joubert syndrome is a rare developmental defect of the cerebellar vermis, with autosomal recessive inheritance. The phenotype is highly variable and may include episodic hyperpnea, abnormal eye movements, hypotonia, ataxia, developmental delay, and mental retardation. Even within sibships the phenotype may vary, making it difficult to establish the exact clinical diagnostic boundaries of Joubert syndrome. To genetically localize the gene region, we have performed a whole-genome scan in two consanguineous families of Arabian/Iranian origins, with multiple affected probands. In one family, we detected linkage to the telomeric region of chromosome 9q, close to the marker D9S158, with a multipoint LOD score of Z=+3.7. The second family did not show linkage to this region, giving a first indication of genetic heterogeneity underlying Joubert syndrome. These findings were supported by subsequent analysis of two smaller families-one compatible with linkage to 9q; the other, unlinked. We conclude that Joubert syndrome is clinically and genetically heterogeneous and that one locus maps to chromosome 9q.

journal_name

Am J Hum Genet

journal_title

American journal of human genetics

authors

Saar K,Al-Gazali L,Sztriha L,Rueschendorf F,Nur-E-Kamal M,Reis A,Bayoumi R

doi

10.1086/302655

subject

Has Abstract

pub_date

1999-12-01 00:00:00

pages

1666-71

issue

6

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(07)63586-1

journal_volume

65

pub_type

杂志文章

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