2-32947710-C-T

Position:

• chr2-32947710-C-T

Variant summary

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

The NM_206943.4(LTBP1):​c.386C>T​(p.Ala129Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000363 in 1,378,402 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A129P) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000036 (0 hom.)
• Consequence: LTBP1 NM_206943.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.779

Genes affected

LTBP1 (HGNC:6714): (latent transforming growth factor beta binding protein 1) The protein encoded by this gene belongs to the family of latent TGF-beta binding proteins (LTBPs). The secretion and activation of TGF-betas is regulated by their association with latency-associated proteins and with latent TGF-beta binding proteins. The product of this gene targets latent complexes of transforming growth factor beta to the extracellular matrix, where the latent cytokine is subsequently activated by several different mechanisms. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

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=0.15973514).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LTBP1	NM_206943.4	c.386C>T	p.Ala129Val	missense_variant	1/34	ENST00000404816.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LTBP1	ENST00000404816.7	c.386C>T	p.Ala129Val	missense_variant	1/34	5	NM_206943.4	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000363 AC: 5 AN: 1378402 Hom.: 0 Cov.: 34 AF XY: 0.00000438 AC XY: 3 AN XY: 684348

Gnomad4 AFR exome AF: 0.0000353

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: 0.00000373

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 05, 2022

The c.386C>T (p.A129V) alteration is located in exon 1 (coding exon 1) of the LTBP1 gene. This alteration results from a C to T substitution at nucleotide position 386, causing the alanine (A) at amino acid position 129 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.080
BayesDel_addAF	Benign	-0.083	T
BayesDel_noAF	Benign	-0.36
CADD	Benign	18
DANN	Uncertain	1.0
DEOGEN2	Benign	0.11	T
Eigen	Benign	-0.61
Eigen_PC	Benign	-0.57
FATHMM_MKL	Benign	0.18	N
LIST_S2	Benign	0.52	T
M_CAP	Pathogenic	0.74	D
MetaRNN	Benign	0.16	T
MetaSVM	Benign	-0.67	T
MutationAssessor	Benign	0.69	N
MutationTaster	Benign	1.0	N;N
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	-0.81	N
REVEL	Benign	0.097
Sift	Benign	0.030	D
Sift4G	Uncertain	0.030	D
Vest4		0.12
MVP		0.19
MPC		0.13
ClinPred		0.19	T
GERP RS		2.3
Varity_R		0.075
gMVP		0.25

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: rs1468939902; hg19: chr2-33172777;