11-65539080-T-C

Variant names:

• chr11-65539080-T-C
• rs1554971742
• NM_001130144.3:c.3912A>G

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PM4

The NM_001130144.3(LTBP3):​c.3912A>G​(p.Ter1304Trpext*?) variant causes a stop lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000809 in 1,236,006 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 8.1e-7 (0 hom.)
• Consequence: LTBP3 NM_001130144.3 stop_lost
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.31
• Publications: 0 publications found

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]

LTBP3 Gene-Disease associations (from GenCC):

• brachyolmia-amelogenesis imperfecta syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE, LIMITED Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• geleophysic dysplasia 3

  Inheritance: AD Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• Acromicric dysplasia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• geleophysic dysplasia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Stoplost variant in NM_001130144.3 Downstream stopcodon found after 3 codons.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001130144.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LTBP3	NM_001130144.3	MANE Select	c.3912A>G	p.Ter1304Trpext*?	stop_lost	Exon 28 of 28	NP_001123616.1	Q9NS15-1
	LTBP3	NM_021070.4		c.3771A>G	p.Ter1257Trpext*?	stop_lost	Exon 27 of 27	NP_066548.2	Q9NS15-2
	LTBP3	NM_001164266.1		c.3420A>G	p.Ter1140Trpext*?	stop_lost	Exon 27 of 27	NP_001157738.1	Q9NS15

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LTBP3	ENST00000301873.11	TSL:2 MANE Select	c.3912A>G	p.Ter1304Trpext*?	stop_lost	Exon 28 of 28	ENSP00000301873.5	Q9NS15-1
	LTBP3	ENST00000322147.8	TSL:1	c.3771A>G	p.Ter1257Trpext*?	stop_lost	Exon 27 of 27	ENSP00000326647.4	Q9NS15-2
	LTBP3	ENST00000528516.5	TSL:1	n.*3416A>G		non_coding_transcript_exon	Exon 27 of 27	ENSP00000432350.1	E9PRF2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 8.09e-7 AC: 1 AN: 1236006 Hom.: 0 Cov.: 31 AF XY: 0.00000166 AC XY: 1 AN XY: 602982

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 23600

American (AMR) AF: 0.00 AC: 0 AN: 14276

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19072

East Asian (EAS) AF: 0.00 AC: 0 AN: 27650

South Asian (SAS) AF: 0.0000160 AC: 1 AN: 62316

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 31570

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3586

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1004116

Other (OTH) AF: 0.00 AC: 0 AN: 49820

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Benign	19
DANN	Benign	0.82
Eigen	Pathogenic	0.96
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Uncertain	0.95	D
PhyloP100		2.3
Vest4		0.21
GERP RS		4.6
Mutation Taster		=58/142	disease causing

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: rs1554971742; hg19: chr11-65306551;