rs140637

Variant names:

• chr15-48474658-A-G
• rs140637
• NM_000138.5:c.3965-8T>C

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The ENST00000316623.10(FBN1):​c.3965-8T>C variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0015 in 1,614,086 control chromosomes in the GnomAD database, including 36 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0080 (13 hom., cov: 32)
  • Exomes 𝑓: 0.00083 (23 hom.)
• Consequence: FBN1 ENST00000316623.10 splice_region, intron
• Scores: Splicing: ADA: 0.0002705
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:19
• Conservation: PhyloP100: 1.93
• Publications: 4 publications found

Genes affected

FBN1 (HGNC:3603): (fibrillin 1) This gene encodes a member of the fibrillin family of proteins. The encoded preproprotein is proteolytically processed to generate two proteins including the extracellular matrix component fibrillin-1 and the protein hormone asprosin. Fibrillin-1 is an extracellular matrix glycoprotein that serves as a structural component of calcium-binding microfibrils. These microfibrils provide force-bearing structural support in elastic and nonelastic connective tissue throughout the body. Asprosin, secreted by white adipose tissue, has been shown to regulate glucose homeostasis. Mutations in this gene are associated with Marfan syndrome and the related MASS phenotype, as well as ectopia lentis syndrome, Weill-Marchesani syndrome, Shprintzen-Goldberg syndrome and neonatal progeroid syndrome. [provided by RefSeq, Apr 2016]

FBN1 Gene-Disease associations (from GenCC):

• familial thoracic aortic aneurysm and aortic dissection

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• Marfan syndrome

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, ClinGen, G2P, PanelApp Australia, Orphanet, Ambry Genetics
• Acromicric dysplasia

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics
• progeroid and marfanoid aspect-lipodystrophy syndrome

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet
• stiff skin syndrome

  Inheritance: AD Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• Weill-Marchesani syndrome 2, dominant

  Inheritance: AD Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• geleophysic dysplasia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• isolated ectopia lentis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• neonatal Marfan syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Weill-Marchesani syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• ectopia lentis 1, isolated, autosomal dominant

  Inheritance: AD Classification: LIMITED Submitted by: G2P
• Shprintzen-Goldberg syndrome

  Inheritance: AD, Unknown Classification: LIMITED, NO_KNOWN Submitted by: ClinGen, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.72).
• BP6: Variant 15-48474658-A-G is Benign according to our data. Variant chr15-48474658-A-G is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 36072.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00798 (1215/152310) while in subpopulation AFR AF = 0.0276 (1146/41564). AF 95% confidence interval is 0.0262. There are 13 homozygotes in GnomAd4. There are 562 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 13 AD,AR,Unknown gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000316623.10. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FBN1	NM_000138.5	MANE Select	c.3965-8T>C		splice_region intron	N/A	NP_000129.3
	FBN1	NM_001406716.1		c.3965-8T>C		splice_region intron	N/A	NP_001393645.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FBN1	ENST00000316623.10	TSL:1 MANE Select	c.3965-8T>C		splice_region intron	N/A	ENSP00000325527.5
	FBN1	ENST00000559133.6	TSL:1	n.3965-8T>C		splice_region intron	N/A	ENSP00000453958.2
	FBN1	ENST00000537463.6	TSL:5	n.637-8T>C		splice_region intron	N/A	ENSP00000440294.2

Frequencies

GnomAD3 genomes AF: 0.00800 AC: 1217 AN: 152192 Hom.: 13 Cov.: 32

Gnomad AFR AF: 0.0277

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00353

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00574

GnomAD2 exomes AF: 0.00197 AC: 494 AN: 251032 AF XY: 0.00139

Gnomad AFR exome AF: 0.0274

Gnomad AMR exome AF: 0.00133

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000882

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000825 AC: 1206 AN: 1461776 Hom.: 23 Cov.: 33 AF XY: 0.000705 AC XY: 513 AN XY: 727190

African (AFR) AF: 0.0309 AC: 1034 AN: 33472

American (AMR) AF: 0.00139 AC: 62 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39692

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53370

Middle Eastern (MID) AF: 0.000347 AC: 2 AN: 5766

European-Non Finnish (NFE) AF: 0.00000450 AC: 5 AN: 1111968

Other (OTH) AF: 0.00169 AC: 102 AN: 60394

GnomAD4 genome AF: 0.00798 AC: 1215 AN: 152310 Hom.: 13 Cov.: 32 AF XY: 0.00755 AC XY: 562 AN XY: 74482

African (AFR) AF: 0.0276 AC: 1146 AN: 41564

American (AMR) AF: 0.00353 AC: 54 AN: 15298

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5184

South Asian (SAS) AF: 0.00 AC: 0 AN: 4824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10616

Middle Eastern (MID) AF: 0.00340 AC: 1 AN: 294

European-Non Finnish (NFE) AF: 0.0000294 AC: 2 AN: 68032

Other (OTH) AF: 0.00568 AC: 12 AN: 2114

Alfa AF: 0.00508 Hom.: 9

Bravo AF: 0.00900

Asia WGS AF: 0.000866 AC: 3 AN: 3478

ClinVar

ClinVar submissions as Germline

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	6	not specified (6)
-	-	3	Familial thoracic aortic aneurysm and aortic dissection (3)
-	-	2	Marfan syndrome (2)
-	-	1	Acromicric dysplasia (1)
-	-	1	Connective tissue disorder (1)
-	-	1	Ectopia lentis 1, isolated, autosomal dominant (1)
-	-	1	Geleophysic dysplasia (1)
-	-	1	Marfan syndrome;C4707243:Familial thoracic aortic aneurysm and aortic dissection (1)
-	-	1	not provided (1)
-	-	1	Stiff skin syndrome (1)
-	-	1	Weill-Marchesani syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.72
CADD	Benign	11
DANN	Benign	0.58
PhyloP100		1.9
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00027
dbscSNV1_RF	Benign	0.018
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: rs140637; hg19: chr15-48766855;