chr8-140300557-CAA-GAG

Variant names:

• chr8-140300557-CAA-GAG
• NM_001160372.4:c.1678_1680delTTGinsCTC
• TRAPPC9 p.561

Variant summary

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

The NM_001160372.4(TRAPPC9):​c.1678_1680delTTGinsCTC​(p.561) variant causes a synonymous 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. Synonymous variant affecting the same amino acid position (i.e. L560L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TRAPPC9 NM_001160372.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.33
• Publications: 0 publications found

Genes affected

TRAPPC9 (HGNC:30832): (trafficking protein particle complex subunit 9) This gene encodes a protein that likely plays a role in NF-kappa-B signaling. Mutations in this gene have been associated with autosomal-recessive cognitive disability. Alternatively spliced transcript variants have been described.[provided by RefSeq, Feb 2010]

TRAPPC9 Gene-Disease associations (from GenCC):

• intellectual disability, autosomal recessive 13

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• intellectual disability-obesity-brain malformations-facial dysmorphism syndrome

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• autosomal recessive non-syndromic intellectual disability

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001160372.4. 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
	TRAPPC9	NM_001160372.4	MANE Select	c.1678_1680delTTGinsCTC	p.561	synonymous	N/A	NP_001153844.1	Q96Q05-1
	TRAPPC9	NM_001374682.1		c.1699_1701delTTGinsCTC	p.568	synonymous	N/A	NP_001361611.1
	TRAPPC9	NM_031466.8		c.1678_1680delTTGinsCTC	p.561	synonymous	N/A	NP_113654.5

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TRAPPC9	ENST00000438773.4	TSL:1 MANE Select	c.1678_1680delTTGinsCTC	p.561	synonymous	N/A	ENSP00000405060.3	Q96Q05-1
	TRAPPC9	ENST00000520857.5	TSL:1	c.1207_1209delTTGinsCTC	p.404	synonymous	N/A	ENSP00000430116.1	H0YBR0
	TRAPPC9	ENST00000889106.1		c.1699_1701delTTGinsCTC	p.568	synonymous	N/A	ENSP00000559165.1

Frequencies

GnomAD3 genomes Cov.: 33

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

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		5.3

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: chr8-141310656;