19-40608301-G-T

Variant names:

• chr19-40608301-G-T
• rs114749335
• NM_001042545.2:c.1238G>T

Variant summary

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

The NM_001042545.2(LTBP4):​c.1238G>T​(p.Gly413Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,476 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 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. G413D) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: LTBP4 NM_001042545.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.528
• Publications: 0 publications found

Genes affected

LTBP4 (HGNC:6717): (latent transforming growth factor beta binding protein 4) The protein encoded by this gene binds transforming growth factor beta (TGFB) as it is secreted and targeted to the extracellular matrix. TGFB is biologically latent after secretion and insertion into the extracellular matrix, and sheds TGFB and other proteins upon activation. Defects in this gene may be a cause of cutis laxa and severe pulmonary, gastrointestinal, and urinary abnormalities. Three transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, May 2010]

LTBP4 Gene-Disease associations (from GenCC):

• cutis laxa with severe pulmonary, gastrointestinal and urinary anomalies

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae), PanelApp Australia

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=0.23611453).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LTBP4	NM_001042545.2	c.1238G>T	p.Gly413Val	missense_variant	Exon 8 of 30	ENST00000396819.8	NP_001036010.1
LTBP4	NM_001042544.1	c.1439G>T	p.Gly480Val	missense_variant	Exon 11 of 33		NP_001036009.1
LTBP4	NM_003573.2	c.1328G>T	p.Gly443Val	missense_variant	Exon 11 of 33		NP_003564.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LTBP4	ENST00000396819.8	c.1238G>T	p.Gly413Val	missense_variant	Exon 8 of 30	1	NM_001042545.2	ENSP00000380031.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000403 AC: 1 AN: 248238 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000889

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461476 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727034

African (AFR) AF: 0.00 AC: 0 AN: 33474

American (AMR) AF: 0.00 AC: 0 AN: 44692

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26130

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

South Asian (SAS) AF: 0.00 AC: 0 AN: 86224

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53284

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

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111838

Other (OTH) AF: 0.00 AC: 0 AN: 60368

GnomAD4 genome Cov.: 32

Alfa AF: 0.00000786 Hom.: 2

Bravo AF: 0.00000756

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Apr 03, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1328G>T (p.G443V) alteration is located in exon 11 (coding exon 11) of the LTBP4 gene. This alteration results from a G to T substitution at nucleotide position 1328, causing the glycine (G) at amino acid position 443 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	0.11
BayesDel_addAF	Benign	-0.073	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	17
DANN	Uncertain	1.0
DEOGEN2	Benign	0.11	T;T;.
Eigen	Benign	-0.51
Eigen_PC	Benign	-0.39
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Benign	0.79	T;T;T
M_CAP	Benign	0.038	D
MetaRNN	Benign	0.24	T;T;T
MetaSVM	Benign	-0.83	T
MutationAssessor	Benign	1.6	.;L;.
PhyloP100		0.53
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-2.3	N;N;N
REVEL	Benign	0.15
Sift	Benign	0.034	D;D;D
Sift4G	Benign	0.22	T;T;T
Polyphen		0.040	.;B;.
Vest4		0.48
MutPred		0.38		.;Loss of glycosylation at P483 (P = 0.1637);.;
MVP		0.30
MPC		0.71
ClinPred		0.089	T
GERP RS		1.7
Varity_R		0.050
gMVP		0.58
Mutation Taster		=96/4	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: rs114749335; hg19: chr19-41114207;