8-7055504-C-G

Variant names:

• chr8-7055504-C-G
• rs7839771
• NM_021010.3:c.212G>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_021010.3(DEFA5):​c.212G>C​(p.Arg71Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,394 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 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 variant affecting the same amino acid position, but resulting in a different missense (i.e. R71H) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: DEFA5 NM_021010.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -8.10
• Publications: 5 publications found

Genes affected

DEFA5 (HGNC:2764): (defensin alpha 5) Defensins are a family of antimicrobial and cytotoxic peptides thought to be involved in host defense. They are abundant in the granules of neutrophils and also found in the epithelia of mucosal surfaces such as those of the intestine, respiratory tract, urinary tract, and vagina. Members of the defensin family are highly similar in protein sequence and distinguished by a conserved cysteine motif. Several of the alpha defensin genes appear to be clustered on chromosome 8. The protein encoded by this gene, defensin, alpha 5, is highly expressed in the secretory granules of Paneth cells of the ileum. [provided by RefSeq, Oct 2014]

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.0698742).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_021010.3. 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
	DEFA5	NM_021010.3	MANE Select	c.212G>C	p.Arg71Pro	missense	Exon 2 of 2	NP_066290.1	Q01523

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DEFA5	ENST00000330590.4	TSL:1 MANE Select	c.212G>C	p.Arg71Pro	missense	Exon 2 of 2	ENSP00000329890.2	Q01523

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000400 AC: 1 AN: 250132 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000545

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461394 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 726934

⚠️ 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: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44688

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26122

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39692

South Asian (SAS) AF: 0.00 AC: 0 AN: 86130

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53352

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111796

Other (OTH) AF: 0.00 AC: 0 AN: 60368

⚠️ 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.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.25
BayesDel_addAF	Benign	-0.41	T
BayesDel_noAF	Benign	-0.66
CADD	Benign	0.0020
DANN	Benign	0.45
DEOGEN2	Benign	0.034	T
Eigen	Benign	-2.7
Eigen_PC	Benign	-2.9
FATHMM_MKL	Benign	0.00017	N
M_CAP	Benign	0.0018	T
MetaRNN	Benign	0.070	T
MetaSVM	Benign	-0.86	T
PhyloP100		-8.1
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-1.6	N
REVEL	Benign	0.064
Sift	Benign	0.20	T
Sift4G	Benign	0.20	T
Polyphen		0.29	B
Vest4		0.11
MutPred		0.39		Loss of MoRF binding (P = 0.0027)
MVP		0.11
MPC		0.00040
ClinPred		0.10	T
GERP RS		-3.4
Varity_R		0.72
gMVP		0.32
Mutation Taster		=85/15	polymorphism

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: rs7839771; hg19: chr8-6913026;