NM_000135.4:c.3981C>A

Variant names:

• chr16-89739507-G-T
• rs141278771
• NM_000135.4:c.3981C>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_000135.4(FANCA):​c.3981C>A​(p.His1327Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000286 in 1,399,054 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H1327P) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000029 (0 hom.)
• Consequence: FANCA NM_000135.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.327
• Publications: 0 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]

ZNF276 (HGNC:23330): (zinc finger protein 276) Enables sequence-specific double-stranded DNA binding activity. Predicted to be involved in regulation of transcription by RNA polymerase II. Located in kinetochore. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 5 benign, 23 uncertain in NM_000135.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.111795634).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000135.4. 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
	FANCA	NM_000135.4	MANE Select	c.3981C>A	p.His1327Gln	missense	Exon 40 of 43	NP_000126.2
	ZNF276	NM_001113525.2	MANE Select	c.*1261G>T		3_prime_UTR	Exon 11 of 11	NP_001106997.1
	FANCA	NM_001286167.3		c.3981C>A	p.His1327Gln	missense	Exon 40 of 43	NP_001273096.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FANCA	ENST00000389301.8	TSL:1 MANE Select	c.3981C>A	p.His1327Gln	missense	Exon 40 of 43	ENSP00000373952.3
	ZNF276	ENST00000443381.7	TSL:1 MANE Select	c.*1261G>T		3_prime_UTR	Exon 11 of 11	ENSP00000415836.2
	ZNF276	ENST00000289816.9	TSL:1	c.*1261G>T		3_prime_UTR	Exon 11 of 11	ENSP00000289816.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000286 AC: 4 AN: 1399054 Hom.: 0 Cov.: 33 AF XY: 0.00000145 AC XY: 1 AN XY: 690096

African (AFR) AF: 0.00 AC: 0 AN: 31602

American (AMR) AF: 0.00 AC: 0 AN: 35716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25184

East Asian (EAS) AF: 0.00 AC: 0 AN: 35764

South Asian (SAS) AF: 0.0000126 AC: 1 AN: 79252

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48956

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5468

European-Non Finnish (NFE) AF: 0.00000185 AC: 2 AN: 1079110

Other (OTH) AF: 0.0000172 AC: 1 AN: 58002

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.21
BayesDel_addAF	Benign	-0.023	T
BayesDel_noAF	Benign	-0.27
CADD	Benign	0.027
DANN	Benign	0.57
DEOGEN2	Benign	0.37	T
Eigen	Benign	-1.8
Eigen_PC	Benign	-1.9
FATHMM_MKL	Benign	0.62	D
LIST_S2	Benign	0.58	T
M_CAP	Benign	0.064	D
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	1.6	L
PhyloP100		-0.33
PrimateAI	Benign	0.42	T
PROVEAN	Uncertain	-2.8	D
REVEL	Benign	0.26
Sift	Benign	0.16	T
Sift4G	Benign	0.23	T
Polyphen		0.025	B
Vest4		0.11
MutPred		0.38		Gain of solvent accessibility (P = 0.0374)
MVP		0.64
ClinPred		0.20	T
GERP RS		-7.7
Varity_R		0.064
gMVP		0.21
Mutation Taster		=90/10	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs141278771; hg19: chr16-89805915;