22-18079935-CGG-GGA

Variant names:

• chr22-18079935-CGG-GGA
• NM_001127649.3:c.292_294delCGGinsGGA
• PEX26 p.Arg98Gly

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM5

The NM_001127649.3(PEX26):​c.292_294delCGGinsGGA​(p.Arg98Gly) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R98W) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PEX26 NM_001127649.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.34
• Publications: 0 publications found

Genes affected

PEX26 (HGNC:22965): (peroxisomal biogenesis factor 26) This gene belongs to the peroxin-26 gene family. It is probably required for protein import into peroxisomes. It anchors PEX1 and PEX6 to peroxisome membranes, possibly to form heteromeric AAA ATPase complexes required for the import of proteins into peroxisomes. Defects in this gene are the cause of peroxisome biogenesis disorder complementation group 8 (PBD-CG8). PBD refers to a group of peroxisomal disorders arising from a failure of protein import into the peroxisomal membrane or matrix. The PBD group is comprised of four disorders: Zellweger syndrome (ZWS), neonatal adrenoleukodystrophy (NALD), infantile Refsum disease (IRD), and classical rhizomelic chondrodysplasia punctata (RCDP). Alternatively spliced transcript variants have been identified for this gene. [provided by RefSeq, Dec 2010]

PEX26 Gene-Disease associations (from GenCC):

• peroxisome biogenesis disorder

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• peroxisome biogenesis disorder 7A (Zellweger)

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• peroxisome biogenesis disorder 7B

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics
• Zellweger spectrum disorders

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000288683 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM5: Other missense variant is known to change same aminoacid residue: Variant chr22-18079935-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 2152.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001127649.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PEX26	NM_001127649.3	MANE Select	c.292_294delCGGinsGGA	p.Arg98Gly	missense	N/A	NP_001121121.1	Q7Z412-1
	PEX26	NM_017929.6		c.292_294delCGGinsGGA	p.Arg98Gly	missense	N/A	NP_060399.1	Q7Z412-1
	PEX26	NM_001199319.2		c.292_294delCGGinsGGA	p.Arg98Gly	missense	N/A	NP_001186248.1	Q7Z412-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PEX26	ENST00000399744.8	TSL:1 MANE Select	c.292_294delCGGinsGGA	p.Arg98Gly	missense	N/A	ENSP00000382648.4	Q7Z412-1
	PEX26	ENST00000329627.11	TSL:1	c.292_294delCGGinsGGA	p.Arg98Gly	missense	N/A	ENSP00000331106.5	Q7Z412-1
	PEX26	ENST00000428061.2	TSL:1	c.292_294delCGGinsGGA	p.Arg98Gly	missense	N/A	ENSP00000412441.2	Q7Z412-2

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		6.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr22-18562701;