Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong
The NM_001353258.2(CYRIB):āc.313A>Gā(p.Arg105Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000256 in 1,602,770 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 10/14 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (ā ).
CYRIB (HGNC:25216): (CYFIP related Rac1 interactor B) Enables small GTPase binding activity. Involved in several processes, including cellular response to molecule of bacterial origin; negative regulation of small GTPase mediated signal transduction; and regulation of organelle organization. Located in mitochondrion. [provided by Alliance of Genome Resources, Apr 2022]
Uncertain significance, criteria provided, single submitter
clinical testing
Ambry Genetics
Jan 04, 2024
The c.313A>G (p.R105G) alteration is located in exon 9 (coding exon 4) of the FAM49B gene. This alteration results from a A to G substitution at nucleotide position 313, causing the arginine (R) at amino acid position 105 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -