9-99105115-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Moderate BP6_Moderate BS1 BS2

The NM_004612.4(TGFBR1):c.-91C>T variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000417 in 986,194 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.0018 (2 hom., cov: 32)
  • Exomes 𝑓: 0.00017 (1 hom.)
• Consequence: TGFBR1 NM_004612.4 5_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.107

Genes affected

TGFBR1 (HGNC:11772): (transforming growth factor beta receptor 1) The protein encoded by this gene forms a heteromeric complex with type II TGF-beta receptors when bound to TGF-beta, transducing the TGF-beta signal from the cell surface to the cytoplasm. The encoded protein is a serine/threonine protein kinase. Mutations in this gene have been associated with Loeys-Dietz aortic aneurysm syndrome (LDAS). Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2008]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.38).
• BP6: Variant 9-99105115-C-T is Benign according to our data. Variant chr9-99105115-C-T is described in ClinVar as [Benign]. Clinvar id is 2504011.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0018 (269/149432) while in subpopulation AFR AF= 0.00627 (257/40994). AF 95% confidence interval is 0.00564. There are 2 homozygotes in gnomad4. There are 129 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd at 269 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TGFBR1	NM_004612.4	c.-91C>T		5_prime_UTR_variant	1/9	ENST00000374994.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TGFBR1	ENST00000374994.9	c.-91C>T		5_prime_UTR_variant	1/9	1	NM_004612.4	P4

Frequencies

GnomAD3 genomes AF: 0.00180 AC: 269 AN: 149324 Hom.: 2 Cov.: 32

Gnomad AFR AF: 0.00629

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000531

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000298

Gnomad OTH AF: 0.000978

GnomAD4 exome AF: 0.000170 AC: 142 AN: 836762 Hom.: 1 Cov.: 13 AF XY: 0.000151 AC XY: 59 AN XY: 389468

Gnomad4 AFR exome AF: 0.00724

Gnomad4 AMR exome AF: 0.000383

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: 0.00000268

Gnomad4 OTH exome AF: 0.000534

GnomAD4 genome AF: 0.00180 AC: 269 AN: 149432 Hom.: 2 Cov.: 32 AF XY: 0.00177 AC XY: 129 AN XY: 73012

Gnomad4 AFR AF: 0.00627

Gnomad4 AMR AF: 0.000530

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000299

Gnomad4 OTH AF: 0.000968

Alfa AF: 0.00142 Hom.: 0

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Apr 03, 2023

Variant summary: TGFBR1 c.-91C>T is located in the untranslated mRNA region upstream of the initiation codon. The variant allele was found at a frequency of 0.0019 in 28470 control chromosomes, predominantly at a frequency of 0.0063 within the African or African-American subpopulation in the gnomAD database. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 3360-fold of the estimated maximal expected allele frequency for a pathogenic variant in TGFBR1 causing Loeys-Dietz Syndrome phenotype (1.9e-06), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African or African-American origin. To our knowledge, no occurrence of c.-91C>T in individuals affected with Loeys-Dietz Syndrome or other TGFBR1-related conditions and no experimental evidence demonstrating its impact on protein function have been reported. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as benign. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.38
Cadd	Benign	20
Dann	Uncertain	0.97

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: rs11568745; hg19: chr9-101867397;