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Bone Marrow Failure v1.91 DCLRE1B Santosh Varughese reviewed gene: DCLRE1B: Rating: GREEN; Mode of pathogenicity: None; Publications: 10699141, 20479256, 35007328; Phenotypes: Dyskeratosis congenita, autosomal recessive 8; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal; Current diagnostic: yes
Bone Marrow Failure v1.26 DCLRE1B Zornitza Stark Marked gene: DCLRE1B as ready
Bone Marrow Failure v1.26 DCLRE1B Zornitza Stark Gene: dclre1b has been classified as Green List (High Evidence).
Bone Marrow Failure v1.26 DCLRE1B Zornitza Stark Phenotypes for gene: DCLRE1B were changed from Dyskeratosis congenita, autosomal recessive 8 to Dyskeratosis congenita, autosomal recessive 8, MIM# 620133
Bone Marrow Failure v1.25 DCLRE1B Zornitza Stark Classified gene: DCLRE1B as Green List (high evidence)
Bone Marrow Failure v1.25 DCLRE1B Zornitza Stark Gene: dclre1b has been classified as Green List (High Evidence).
Bone Marrow Failure v1.24 DCLRE1B Manny Jacobs 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
Added comment: 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: Literature