Bone Marrow Failure
Gene: DCLRE1B
PMID 35007328
3 unrelated individuals with progressive bone marrow failure in early childhood. Other variable features reported: growth restriction, mild microcephaly (-2.5 SD), facial dysmorphism, and speech delay or learning difficulties, one patient with mucocutaneous features. Two individuals developed esophageal strictures and the third developed inflammatory ulcerative colitis.
2 patients chet for truncating/missense variant
1 patient hom for missense variant
Patient cell lines demonstrated telomere fragility and instability and an increase in spontaneous radial chromosomes, chromosome breaks and sister chromatid exchanges, as well as reduced cell survival. CRISPR introduction of one WT allele in one patient complemented DNA repair defects.
PMID: 20479256
One individual with Hoyeraal-Hreidarsson syndrome reported with shortened transcript in DCLRE1B of the patient’s cells; not seen in controls or other HH patients. Shortened transcript identified caused by intra-exonic splice of exon 4 leading to out-of-frame deletion causing premature stop codon (denoted splice variant “Apollo-Δ”) No molecular origin of splice variant could be identified and only linked to HH is by this one reported patient and the known DCLRE1B (SNM1B) role in telomere protection.
Sources: LiteratureCreated: 1 Dec 2022, 4:14 a.m.
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
Dyskeratosis congenita, autosomal recessive 8
Publications
Gene: dclre1b has been classified as Green List (High Evidence).
Phenotypes for gene: DCLRE1B were changed from Dyskeratosis congenita, autosomal recessive 8 to Dyskeratosis congenita, autosomal recessive 8, MIM# 620133
Gene: dclre1b has been classified as Green List (High Evidence).
gene: DCLRE1B was added gene: DCLRE1B was added to Bone Marrow Failure. Sources: Literature Mode of inheritance for gene: DCLRE1B was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: DCLRE1B were set to 10699141; 20479256; 35007328 Phenotypes for gene: DCLRE1B were set to Dyskeratosis congenita, autosomal recessive 8 Review for gene: DCLRE1B was set to GREEN