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Tubulinopathies v1.2 TTL Bryony Thompson Marked gene: TTL as ready
Tubulinopathies v1.2 TTL Bryony Thompson Gene: ttl has been classified as Amber List (Moderate Evidence).
Tubulinopathies v1.2 TTL Bryony Thompson Classified gene: TTL as Amber List (moderate evidence)
Tubulinopathies v1.2 TTL Bryony Thompson Gene: ttl has been classified as Amber List (Moderate Evidence).
Tubulinopathies v1.2 TTL Bryony Thompson Classified gene: TTL as Amber List (moderate evidence)
Tubulinopathies v1.2 TTL Bryony Thompson Gene: ttl has been classified as Amber List (Moderate Evidence).
Tubulinopathies v1.1 TTL Mark Cleghorn gene: TTL was added
gene: TTL was added to Tubulinopathies. Sources: Other
Mode of inheritance for gene: TTL was set to BIALLELIC, autosomal or pseudoautosomal
Phenotypes for gene: TTL were set to complex neurodevelopmental disorder MONDO:0100038
Penetrance for gene: TTL were set to unknown
Review for gene: TTL was set to AMBER
Added comment: TTL
Valentina Serpieri, University of Pavia
ESHG talk 1/6/24

FAM1 (Italy)
2 affected sisters born to consanguineous Pakistani parents
GDD, spastic tetraparesis, optic atrophy, brain anomalies resembling tubulinopathies (dysplasia of corpus callosum, basal ganglia, brainstem)
WES: homozygous TTL:c.1013G>A; p.Cys338Tyr in both affected sisters

Via genematcher
5 more families (9 individuals) w similar phenotypes and biallelic variants in TTL

FAM2 (Egypt): homozygous p.Arg46Pro
FAM3 (Egypt): homozygous p.Arg46Pro
FAM4 (Australia): homozygous p.Gln183Arg
FAM5 (France): homozygous p.Trp147*
FAM6 (Saudi Arabia): homozygous p.His243Tyr

TTL KO mice: death soon after birth, no overt malformations, but defects in organisation of cerebral layers

Functional work on patient fibroblasts
FAM1 – reduced quantity of TTL protein compared to control on Western blot, decreased function of TTL protein (increase in detyrosinated tubulin) compared to controls – infer LoF as mechanism
FAM3 – mentioned but no details
FAM4– mentioned but no details
Sources: Other