8-140360188-G-T

Variant names:

• chr8-140360188-G-T
• rs534194766
• NM_001160372.4:c.1357C>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001160372.4(TRAPPC9):​c.1357C>A​(p.His453Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,866 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. H453Y) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: TRAPPC9 NM_001160372.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.70
• 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: ClinGen, Orphanet
• autosomal recessive non-syndromic intellectual disability

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TRAPPC9	NM_001160372.4	MANE Select	c.1357C>A	p.His453Asn	missense	Exon 9 of 23	NP_001153844.1
	TRAPPC9	NM_001374682.1		c.1378C>A	p.His460Asn	missense	Exon 10 of 24	NP_001361611.1
	TRAPPC9	NM_031466.8		c.1357C>A	p.His453Asn	missense	Exon 9 of 23	NP_113654.5

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TRAPPC9	ENST00000438773.4	TSL:1 MANE Select	c.1357C>A	p.His453Asn	missense	Exon 9 of 23	ENSP00000405060.3
	TRAPPC9	ENST00000520857.5	TSL:1	c.886C>A	p.His296Asn	missense	Exon 7 of 21	ENSP00000430116.1
	TRAPPC9	ENST00000648948.2		c.1357C>A	p.His453Asn	missense	Exon 9 of 23	ENSP00000498020.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461866 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727238

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1112000

Other (OTH) AF: 0.00 AC: 0 AN: 60388

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.25
BayesDel_addAF	Uncertain	0.027	T
BayesDel_noAF	Benign	-0.20
CADD	Uncertain	26
DANN	Uncertain	0.98
DEOGEN2	Benign	0.016	T
Eigen	Benign	0.13
Eigen_PC	Uncertain	0.30
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.93	D
M_CAP	Benign	0.018	T
MetaRNN	Uncertain	0.59	D
MetaSVM	Benign	-0.93	T
MutationAssessor	Benign	1.3	L
PhyloP100		9.7
PrimateAI	Uncertain	0.76	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.28
Sift	Benign	0.41	T
Sift4G	Benign	0.17	T
Polyphen		0.96	D
Vest4		0.67
MutPred		0.36		Gain of relative solvent accessibility (P = 0.0082)
MVP		0.24
MPC		1.0
ClinPred		0.92	D
GERP RS		4.7
Varity_R		0.34
gMVP		0.54
Mutation Taster		=65/35	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs534194766; hg19: chr8-141370287;