8-140451105-T-G

Variant names:

• chr8-140451105-T-G
• rs550423753
• NM_001160372.4:c.269A>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001160372.4(TRAPPC9):​c.269A>C​(p.Lys90Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,834 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. 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. K90R) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: TRAPPC9 NM_001160372.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.35
• 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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.12139666).

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.269A>C	p.Lys90Thr	missense	Exon 2 of 23	NP_001153844.1
	TRAPPC9	NM_001374682.1		c.269A>C	p.Lys90Thr	missense	Exon 2 of 24	NP_001361611.1
	TRAPPC9	NM_031466.8		c.269A>C	p.Lys90Thr	missense	Exon 2 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.269A>C	p.Lys90Thr	missense	Exon 2 of 23	ENSP00000405060.3
	TRAPPC9	ENST00000648948.2		c.269A>C	p.Lys90Thr	missense	Exon 2 of 23	ENSP00000498020.1
	TRAPPC9	ENST00000520857.5	TSL:1	c.-176A>C		upstream_gene	N/A	ENSP00000430116.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461834 Hom.: 0 Cov.: 80 AF XY: 0.00000138 AC XY: 1 AN XY: 727212

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86252

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53414

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111976

Other (OTH) AF: 0.0000166 AC: 1 AN: 60394

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.064	T
BayesDel_noAF	Benign	-0.33
CADD	Benign	19
DANN	Uncertain	0.98
DEOGEN2	Benign	0.012	T
Eigen	Benign	-0.30
Eigen_PC	Benign	-0.17
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.91	D
M_CAP	Benign	0.0072	T
MetaRNN	Benign	0.12	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.69	N
PhyloP100		1.3
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-0.45	N
REVEL	Benign	0.17
Sift	Benign	0.55	T
Sift4G	Benign	0.40	T
Polyphen		0.83	P
Vest4		0.49
MutPred		0.37		Loss of methylation at K90 (P = 0.0104)
MVP		0.15
MPC		0.77
ClinPred		0.38	T
GERP RS		2.9
PromoterAI		-0.033	Neutral
Varity_R		0.048
gMVP		0.50
Mutation Taster		=81/19	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: rs550423753; hg19: chr8-141461204;