rs1555536446

Variant names:

• chr16-89745062-GCCA-G
• rs1555536446
• NM_000135.4:c.3520_3522delTGG

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM2 PM4_Supporting PP5_Very_Strong

The NM_000135.4(FANCA):​c.3520_3522delTGG​(p.Trp1174del) variant causes a conservative inframe deletion change. The variant allele was found at a frequency of 0.00000344 in 1,452,836 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: FANCA NM_000135.4 conservative_inframe_deletion
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 5.53
• Publications: 1 publications found

Genes affected

FANCA (HGNC:3582): (FA complementation group A) The Fanconi anemia complementation group (FANC) currently includes FANCA, FANCB, FANCC, FANCD1 (also called BRCA2), FANCD2, FANCE, FANCF, FANCG, FANCI, FANCJ (also called BRIP1), FANCL, FANCM and FANCN (also called PALB2). The previously defined group FANCH is the same as FANCA. Fanconi anemia is a genetically heterogeneous recessive disorder characterized by cytogenetic instability, hypersensitivity to DNA crosslinking agents, increased chromosomal breakage, and defective DNA repair. The members of the Fanconi anemia complementation group do not share sequence similarity; they are related by their assembly into a common nuclear protein complex. This gene encodes the protein for complementation group A. Alternative splicing results in multiple transcript variants encoding different isoforms. Mutations in this gene are the most common cause of Fanconi anemia. [provided by RefSeq, Jul 2008]

FANCA Gene-Disease associations (from GenCC):

• Fanconi anemia complementation group A

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Laboratory for Molecular Medicine, ClinGen, Ambry Genetics, Labcorp Genetics (formerly Invitae), Myriad Women’s Health, G2P
• Fanconi anemia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_000135.4. Strenght limited to Supporting due to length of the change: 1aa.
• PP5: Variant 16-89745062-GCCA-G is Pathogenic according to our data. Variant chr16-89745062-GCCA-G is described in ClinVar as Pathogenic. ClinVar VariationId is 456115.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FANCA	NM_000135.4	c.3520_3522delTGG	p.Trp1174del	conservative_inframe_deletion	Exon 36 of 43	ENST00000389301.8	NP_000126.2
FANCA	NM_001286167.3	c.3520_3522delTGG	p.Trp1174del	conservative_inframe_deletion	Exon 36 of 43		NP_001273096.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FANCA	ENST00000389301.8	c.3520_3522delTGG	p.Trp1174del	conservative_inframe_deletion	Exon 36 of 43	1	NM_000135.4	ENSP00000373952.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000344 AC: 5 AN: 1452836 Hom.: 0 AF XY: 0.00000415 AC XY: 3 AN XY: 722720

African (AFR) AF: 0.00 AC: 0 AN: 33370

American (AMR) AF: 0.00 AC: 0 AN: 44292

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26044

East Asian (EAS) AF: 0.00 AC: 0 AN: 39522

South Asian (SAS) AF: 0.00 AC: 0 AN: 85574

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 47626

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5758

European-Non Finnish (NFE) AF: 0.00000450 AC: 5 AN: 1110502

Other (OTH) AF: 0.00 AC: 0 AN: 60148

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Fanconi anemia complementation group A Pathogenic:3

Sep 16, 2020

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Oct 10, 2022

Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has been reported in the literature in the homozygous or compound heterozygous states in several individuals with Fanconi anemia (Selected publications: Levran 1997 PMID: 9371798; Chandrasekharappa 2013 PMID: 23613520; Donovan 2016 PMID: 26841305; Steinberg-Shemer 2020 PMID: 31558676). This variant is absent from large control databases but is present in ClinVar, with multiple laboratories classifying it as pathogenic (Variation ID: 4561156). Functional studies have shown that this variant impacts the encoded protein's function (Adachi 2002 PMID: 12444097); however, these studies may not accurately represent in vivo biological function. This variant represents an in-frame deletion of 1 amino acid at position 1174 and is not predicted to alter the reading frame, but the effect of this variant on the protein is unclear. In summary, this variant is classified as pathogenic. -

Sep 21, 2023

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Pathogenic:2

Dec 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

FANCA: PM3:Very Strong, PM2, PM4:Supporting -

May 02, 2023

Clinical Genetics Laboratory, Skane University Hospital Lund

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Fanconi anemia Pathogenic:1

Jul 19, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant, c.3520_3522del, results in the deletion of 1 amino acid(s) of the FANCA protein (p.Trp1174del), but otherwise preserves the integrity of the reading frame. This variant is not present in population databases (gnomAD no frequency). This variant has been observed in individual(s) with Fanconi anemia (PMID: 9371789, 17924555, 23613520, 25703136). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 456115). Algorithms developed to predict the effect of variants on gene product structure and function are not available or were not evaluated for this variant. Experimental studies have shown that this variant affects FANCA function (PMID: 12444097). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		5.5
Mutation Taster		=40/60	disease causing (ClinVar)

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: rs1555536446; hg19: chr16-89811470;