chr11-65539114-G-A

Position:

• chr11-65539114-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001130144.3(LTBP3):​c.3878C>T​(p.Pro1293Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000757 in 1,321,624 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.6e-7 (0 hom.)
• Consequence: LTBP3 NM_001130144.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.615

Genes affected

LTBP3 (HGNC:6716): (latent transforming growth factor beta binding protein 3) The protein encoded by this gene forms a complex with transforming growth factor beta (TGF-beta) proteins and may be involved in their subcellular localization. Activation of this complex requires removal of the encoded binding protein. This protein also may play a structural role in the extracellular matrix. Three transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Jan 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2627746).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LTBP3	NM_001130144.3	c.3878C>T	p.Pro1293Leu	missense_variant	28/28	ENST00000301873.11
LTBP3	NM_021070.4	c.3737C>T	p.Pro1246Leu	missense_variant	27/27
LTBP3	NM_001164266.1	c.3386C>T	p.Pro1129Leu	missense_variant	27/27

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LTBP3	ENST00000301873.11	c.3878C>T	p.Pro1293Leu	missense_variant	28/28	2	NM_001130144.3	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.57e-7 AC: 1 AN: 1321624 Hom.: 0 Cov.: 31 AF XY: 0.00000154 AC XY: 1 AN XY: 649276

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000185

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Brachyolmia-amelogenesis imperfecta syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 18, 2023

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant  is likely to be tolerated. This variant has not been reported in the literature in individuals affected with LTBP3-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 1293 of the LTBP3 protein (p.Pro1293Leu). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.084
BayesDel_addAF	Uncertain	0.039	T
BayesDel_noAF	Benign	-0.18
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.67	.;D;.;.;.
Eigen	Benign	-0.080
Eigen_PC	Benign	-0.058
FATHMM_MKL	Benign	0.63	D
LIST_S2	Benign	0.85	T;T;T;T;T
M_CAP	Uncertain	0.10	D
MetaRNN	Benign	0.26	T;T;T;T;T
MetaSVM	Benign	-0.31	T
MutationAssessor	Benign	0.59	.;N;.;.;.
MutationTaster	Benign	0.97	D;D;D;D;D;D
PrimateAI	Uncertain	0.56	T
PROVEAN	Uncertain	-3.9	D;D;D;D;D
REVEL	Uncertain	0.50
Sift	Benign	0.065	T;T;D;D;D
Sift4G	Uncertain	0.048	D;D;D;D;T
Polyphen		0.99	D;P;.;.;P
Vest4		0.35
MutPred		0.58		.;Loss of glycosylation at P1293 (P = 0.0607);.;.;.;
MVP		0.86
ClinPred		0.86	D
GERP RS		3.8
Varity_R		0.15
gMVP		0.59

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

Publications

LitVar

Other links and lift over

dbSNP: rs1855921139; hg19: chr11-65306585;