8-93803652-CGA-GGG

Variant names:

• chr8-93803652-CGA-GGG
• NM_153704.6:c.2290_2292delCGAinsGGG
• TMEM67 p.Arg764Gly

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM1

The NM_153704.6(TMEM67):​c.2290_2292delCGAinsGGG​(p.Arg764Gly) 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. R764Q) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TMEM67 NM_153704.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.20
• Publications: 0 publications found

Genes affected

TMEM67 (HGNC:28396): (transmembrane protein 67) The protein encoded by this gene localizes to the primary cilium and to the plasma membrane. The gene functions in centriole migration to the apical membrane and formation of the primary cilium. Multiple transcript variants encoding different isoforms have been found for this gene. Defects in this gene are a cause of Meckel syndrome type 3 (MKS3) and Joubert syndrome type 6 (JBTS6). [provided by RefSeq, Nov 2008]

TMEM67 Gene-Disease associations (from GenCC):

• ciliopathy

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, PanelApp Australia
• COACH syndrome 1

  Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
• Meckel syndrome, type 3

  Inheritance: AR Classification: DEFINITIVE Submitted by: Ambry Genetics
• nephronophthisis 11

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• COACH syndrome 1

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics
• Joubert syndrome 6

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• Joubert syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Meckel syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Senior-Boichis syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

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

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 8 uncertain in NM_153704.6

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_153704.6. 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
	TMEM67	NM_153704.6	MANE Select	c.2290_2292delCGAinsGGG	p.Arg764Gly	missense	N/A	NP_714915.3
	TMEM67	NM_001142301.1		c.2047_2049delCGAinsGGG	p.Arg683Gly	missense	N/A	NP_001135773.1	Q5HYA8
	TMEM67	NR_024522.2		n.2311_2313delCGAinsGGG		non_coding_transcript_exon	Exon 22 of 29

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TMEM67	ENST00000453321.8	TSL:1 MANE Select	c.2290_2292delCGAinsGGG	p.Arg764Gly	missense	N/A	ENSP00000389998.3	Q5HYA8
	TMEM67	ENST00000452276.6	TSL:1	c.2290_2292delCGAinsGGG	p.Arg764Gly	missense	N/A	ENSP00000388671.2	C9JRQ8
	TMEM67	ENST00000474944.5	TSL:1	n.1428_1430delCGAinsGGG		non_coding_transcript_exon	Exon 13 of 17

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		6.2

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: chr8-94815880;